Part Part 2 - Vehicle Standard (Australian Design Rule 112/00 – Control of Real Driving Emissions for Light Vehicles) 2024 - In the case that any vehicles included in the approval to this Regulation are not approved according to UN Regulation No.154: | Zoe
Vehicle Standard (Australian Design Rule 112/00 – Control of Real Driving Emissions for Light Vehicles) 2024
Part 2In the case that any vehicles included in the approval to this Regulation are not approved according to UN Regulation No.154:
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Part 2 In the case that any vehicles included in the approval to this Regulation are not approved according to UN Regulation No.154:
0 GENERAL
0.1. Make (trade name of manufacturer): …
0.2. Type: …
0.2.1. Commercial name(s) (if available): …
0.2.2.1. Allowed Parameter Values for multistage type approval (if applicable) to use the base vehicle emission values (insert range if applicable): Final Vehicle mass in running order (in kg): Frontal area for final vehicle (in cm2): Rolling resistance (kg/t): Cross-sectional area of air entrance of the front grille (in cm2):
0.2.3. Family identifiers:
0.2.3.1. Interpolation family: …
0.2.3.3. PEMS family identifier:
0.2.3.6. Periodic regeneration family(s): …
0.2.3.10. ER family(s): …
0.2.3.11. Gas Fuelled Vehicle family(s): …
0.2.3.12. other family(s): …
0.4. Category of vehicle (c): …
0.8. Name(s) and address(es) of assembly plant(s): …
0.9. Name and address of the manufacturer's representative (if any): …
GENERAL CONSTRUCTION CHARACTERISTICS
1.1. Photographs and/or drawings of a representative vehicle/component/separate technical unit (1):
3.2.2.5. Maximum amount of biofuel acceptable in fuel (manufacturer's declared value): … % by volume
3.2.4. Fuel feed
3.2.4.1. By carburettor(s): yes/no (1)
3.2.4.2. By fuel injection (compression ignition or dual fuel only): yes/no (1)
3.2.4.2.1. System description (common rail/unit injectors/distribution pump etc.): …
3.2.4.2.2. Working principle: direct injection/pre-chamber/swirl chamber (1)
3.2.4.2.3. Injection/Delivery pump
3.2.4.2.3.1. Make(s): …
3.2.4.2.3.2. Type(s): …
3.2.4.2.3.3. Maximum fuel delivery (1) (2): … mm3 /stroke or cycle at an engine speed of: … min–1 or, alternatively, a characteristic diagram: … (When boost control is supplied, state the characteristic fuel delivery and boost pressure versus engine speed)
3.2.4.2.4. Engine speed limitation control
3.2.4.2.4.2.1. Speed at which cut-off starts under load: … min–1
3.2.9.1. Description and/or drawing of the exhaust manifold: …
3.2.9.2. Description and/or drawing of the exhaust system: …
3.2.9.3. Maximum allowable exhaust back pressure at rated engine speed and at 100 % load (compression ignition engines only): … kPa
3.2.10. Minimum cross-sectional areas of inlet and outlet ports: …
3.2.11. Valve timing or equivalent data
3.2.11.1. Maximum lift of valves, angles of opening and closing, or timing details of alternative distribution systems, in relation to dead centres. For variable timing system, minimum and maximum timing: …
3.2.11.2. Reference and/or setting ranges (1): …
3.2.12. Measures taken against air pollution
3.2.12.1. Device for recycling crankcase gases (description and drawings): …
3.2.12.2. Pollution control devices (if not covered by another heading)
3.2.12.2.1. Catalytic converter
3.2.12.2.1.1. Number of catalytic converters and elements (provide the information below for each separate unit): …
3.2.12.2.1.2. Dimensions, shape and volume of the catalytic converter(s): …
3.2.12.2.1.3. Type of catalytic action: …
3.2.12.2.1.4. Total charge of precious metals: …
3.2.12.2.1.5. Relative concentration: …
3.2.12.2.1.6. Substrate (structure and material): …
3.2.12.2.1.7. Cell density: …
3.2.12.2.1.8. Type of casing for the catalytic converter(s): …
3.2.12.2.1.9. Location of the catalytic converter(s) (place and reference distance in the exhaust line): …
3.2.12.2.1.11. Normal operating temperature range: … °C
3.2.12.2.4.2. Water-cooled system (to be specified for each EGR system e.g. low pressure/high pressure/combined pressure: yes/no (1)
3.2.12.2.6. Particulate trap (PT): yes/no (1)
3.2.12.2.6.1. Dimensions, shape and capacity of the particulate trap: …
3.2.12.2.6.2. Design of the particulate trap: …
3.2.12.2.6.3. Location (reference distance in the exhaust line): …
3.2.12.2.6.4. Make of particulate trap: …
3.2.12.2.6.5. Identifying part number: …
3.2.12.2.10. Periodically regenerating system: (provide the information below for each separate unit)
3.2.12.2.10.1. Method or system of regeneration, description and/or drawing: …
3.2.12.2.10.2. The number of Type 1 operating cycles, or equivalent engine test bench cycles, between two cycles where regenerative phases occur under the conditions equivalent to Type 1 test (Distance ‘D’): …
3.2.12.2.10.2.1. Applicable Type 1 cycle: …
3.2.12.2.10.2.2. The number of complete applicable test cycles required for regeneration (distance ‘d’)
3.2.12.2.10.3. Description of method employed to determine the number of cycles between two cycles where regenerative phases occur: …
3.2.12.2.10.4. Parameters to determine the level of loading required before regeneration occurs (i.e. temperature, pressure etc.): …
3.2.12.2.10.5. Description of method used to load system: …
3.2.12.2.11. Catalytic converter systems using consumable reagents (provide the information below for each separate unit) yes/no (1)
3.2.12.2.11.1. Type and concentration of reagent needed: …
3.2.12.2.11.2. Normal operational temperature range of reagent: …
3.2.12.2.11.3. International standard: …
3.2.12.2.11.4. Frequency of reagent refill: continuous/maintenance (where appropriate):
3.2.12.2.11.5. Reagent indicator: (description and location)
3.2.12.2.11.6. Reagent tank
3.2.12.2.11.6.1. Capacity: …
3.2.12.2.11.6.2. Heating system: yes/no
3.2.12.2.11.6.2.1. Description or drawing
3.2.12.2.11.7. Reagent control unit: yes/no (1)
3.2.12.2.11.7.1. Make: …
3.2.12.2.11.7.2. Type: …
3.2.12.2.11.8. Reagent injector (make type and location): …
3.2.12.2.11.9. Reagent quality sensor (make, type and location): …
3.2.12.2.12. Water injection: yes/no (1)
3.2.14. Details of any devices designed to influence fuel economy (if not covered by other items):.…
3.2.15. LPG fuelling system: yes/no (1)
3.2.15.1. Approval number (approval number of UN Regulation No. 67): …
3.2.15.2. Electronic engine management control unit for LPG fuelling
3.4.5.3.1. When used as traction motor: single-/multimotors (number) (1): …
3.4.5.4. Maximum power: … kW
3.4.5.5. Working principle
3.4.5.5.5.1 Direct current/alternating current/number of phases: …
3.4.5.5.2. Separate excitation/series/compound (1)
3.4.5.5.3. Synchronous/asynchronous (1)
3.4.6. Control unit
3.4.6.1. Make(s): …
3.4.6.2. Type(s): …
3.4.6.3. Identification number: …
3.4.7. Power controller
3.4.7.1. Make: …
3.4.7.2. Type: …
3.4.7.3. Identification number: …
3.6.5. Lubricant temperatureMinimum: … K — maximum: … K
3.8. Lubrication system
3.8.1. Description of the system
3.8.1.1. Position of lubricant reservoir: …
3.8.1.2. Feed system (by pump/injection into intake/mixing with fuel, etc.) (1)
3.8.2. Lubricating pump
3.8.2.1. Make(s): …
3.8.2.2. Type(s): …
3.8.3. Mixture with fuel
3.8.3.1. Percentage: …
3.8.4. Oil cooler: yes/no (1)
3.8.4.1. Drawing(s): … or
3.8.4.1.1. Make(s): …
3.8.4.1.2. Type(s): …
3.8.5. Lubricant specification: …W…
TRANSMISSION (p)
4.4. Clutch(es)
4.4.1. Type: …
4.4.2. Maximum torque conversion: …
4.5. Gearbox
4.5.1. Type (manual/automatic/CVT (continuously variable transmission)) (1)
4.5.1.4. Torque rating: …
4.5.1.5. Number of clutches: …
4.6. Gear ratios
| Gear | Internal gearbox ratios (ratios of engine to gearbox output shaft revolutions) | Final drive ratio(s) (ratio of gearbox output shaft to driven wheel revolutions) | Total gear ratios |
| --- | --- | --- | --- |
| Maximum for CVT | | | |
| 1 | | | |
| 2 | | | |
| 3 | | | |
| … | | | |
| Minimum for CVT | | | |
4.7. Maximum vehicle design speed (in km/h) (q): …
4.12. Gearbox lubricant: …W…
SUSPENSION
6.6. Tyres and wheels
6.6.1. Tyre/wheel combination(s)
6.6.1.1. Axles
6.6.1.1.1. Axle 1: …
6.6.1.1.1.1. Tyre size designation
6.6.1.1.2. Axle 2: …
6.6.1.1.2.1. Tyre size designation
etc.
6.6.2. Upper and lower limits of rolling radii
6.6.2.1. Axle 1: …
6.6.2.2. Axle 2: …
6.6.3. Tyre pressure(s) as recommended by the vehicle manufacturer: … kPa
BODYWORK
9.1. Type of bodywork (c): …
MISCELLANEOUS
12.10. Devices or systems with driver selectable modes which influence CO2 emissions, electric energy consumption and/or criteria emissions and do not have a predominant mode: yes/no (1)
12.10.1. Charge sustaining test (if applicable) (state for each device or system)
12.10.1.0. Predominant mode under CS condition: yes/no (1)
12.10.1.0.1. Predominant mode under CS condition: … (if applicable)
12.10.1.1. Best case mode: … (if applicable)
12.10.1.2. Worst case mode: … (if applicable)
12.10.1.3. Mode which enables the vehicle to follow the reference test cycle: … (in case no predominant mode under CS condition and only one mode is able to follow the reference test cycle)
12.10.2. Charge depleting test (if applicable) (state for each device or system)
12.10.2.0. Predominant mode under CD condition: yes/no (1)
12.10.2.0.1. Predominant mode under CD condition: … (if applicable)
12.10.2.1. Most energy consuming mode: … (if applicable)
12.10.2.2. Mode which enables the vehicle to follow the reference test cycle: … (in case no predominant mode under CD condition and only one mode is able to follow the reference test cycle)
12.10.3. Type 1 test (if applicable) (state for each device or system)
12.10.3.1. Best case mode: …
12.10.3.2. Worst case mode: …
Explanatory notes
(1) Delete where not applicable (there are cases where nothing needs to be deleted when more than one entry is applicable).
(2) Specify the tolerance.
(3) Please fill in here the upper and lower values for each variant.
(7) Optional equipment that affects the dimensions of the vehicle shall be specified.
(f) Where there is one version with a normal cab and another with a sleeper cab, both sets of masses and dimensions are to be stated.
(g) Standard ISO 612: 1978 — Road vehicles — Dimensions of motor vehicles and towed vehicles — terms and definitions.
(h) The mass of the driver is assessed at 75 kg.
The liquid containing systems (except those for used water that must remain empty) are filled to 100 % of the capacity specified by the manufacturer.
(i) For trailers or semi-trailers, and for vehicles coupled with a trailer or a semi-trailer, which exert a significant vertical load on the coupling device or the fifth wheel, this load, divided by standard acceleration of gravity, is included in the maximum technically permissible mass.
(k) In the case of a vehicle that can run either on petrol, diesel, etc., or also in combination with another fuel, items shall be repeated.
In the case of non-conventional engines and systems, particulars equivalent to those referred to here shall be supplied by the manufacturer.
(m) This value shall be calculated (π = 3.1416) and rounded off to the nearest cm3.
(n) Determined in accordance with the requirements of UN Regulation No. 85.
(p) The specified particulars are to be given for any proposed variants.
(q) With respect to trailers, maximum speed permitted by the manufacturer.
issued by: (Name of administration)<br>......................................<br>......................................<br>......................................<br>
0.8. Name(s) and address(es) of assembly plant(s):
0.9. If applicable, name and address of manufacturer's representative:
1.0. Remarks: …
Section II
1. Additional information (where applicable):
2. Technical Service responsible for carrying out the tests:
3. Dates of RDE test report:
4. Number of RDE test reports:
5. Remarks (if any):
6. Place:
7. Date:
8. Signature:
Attachments: 1. Information package.
2. Test reports (as prescribed in paragraph 10.8. of this Regulation)
Annex 3
Arrangement of the approval mark
In the approval mark issued and affixed to a vehicle in conformity with paragraph 5. of this Regulation, the type approval number shall be accompanied by an alphanumeric character reflecting the level that the approval is limited to.
This annex outlines the appearance of this mark and gives an example how it shall be composed.
The following schematic graphic presents the general lay-out, proportions and contents of the marking. The meaning of numbers and alphabetical character are identified, and sources to determine the corresponding alternatives for each approval case are also referred.
Test procedure for vehicle emissions testing with a portable emissions measurement system (PEMS)
1. Introduction
This annex describes the test procedure to determine exhaust emissions from light passenger and commercial vehicles using a Portable Emissions Measurement System.
2. Symbols, Parameters and Units
pe
—
evacuated pressure [kPa]
qvs
—
volume flow rate of the system [l/min]
ppmC1
—
parts per million carbon equivalent
Vs
—
system volume [l]
3. General requirements
3.1. PEMS
The test shall be carried out with a PEMS, composed of components specified in paragraphs 3.1.1. to 3.1.5. If applicable, a connection with the vehicle ECU may be established to determine relevant engine and vehicle parameters as specified in paragraph 3.2.
3.1.1. Analysers to determine the concentration of pollutants in the exhaust gas.
3.1.2. One or multiple instruments or sensors to measure or determine the exhaust mass flow.
3.1.3. A GNSS receiver to determine the position, altitude and speed of the vehicle.
3.1.4. If applicable, sensors and other appliances being not part of the vehicle, e.g. to measure ambient temperature, relative humidity and air pressure.
3.1.5. An energy source independent of the vehicle to power the PEMS.
3.2. Test parameters
Test parameters, as specified in Table A4/1, shall be measured at a constant frequency of 1.0 Hz or higher and recorded and reported in accordance with the requirements of paragraph 10. of Annex 7 at a sampling frequency of 1.0 Hz. If ECU parameters are obtained, these may be obtained at a substantially higher frequency but the recording rate shall be 1.0 Hz. The PEMS analysers, flow-measuring instruments and sensors shall comply with the requirements laid down in Annexes 5 and 6.
The installation of the PEMS shall follow the instructions of the PEMS manufacturer and the local health and safety regulations. When the PEMS is installed inside the vehicle, the vehicle should be equipped with gas monitors or warning systems for hazardous gases (e.g. CO). The PEMS should be installed as to minimise electromagnetic interferences during the test as well as exposure to shocks, vibration, dust and variability in temperature. The installation and operation of the PEMS shall be such that it avoids leakage and minimise heat loss. The installation and operation of PEMS shall not change the nature of the exhaust gas nor unduly increase the length of the tailpipe. To avoid the generation of particles, connectors shall be thermally stable at the exhaust gas temperatures expected during the test. It is recommended to avoid the use elastomer connectors to connect the vehicle exhaust outlet and the connecting tube. Elastomer connectors, if used, shall have no contact with the exhaust gas to avoid artefacts. If the test performed with the use of elastomer connectors fails, the test shall be repeated without the use of elastomer connectors.
3.4.2. Permissible backpressure
The installation and operation of the PEMS sampling probes shall not unduly increase the pressure at the exhaust outlet in a way that may influence the representativeness of the measurements. It is thus recommended that only one sampling probe is installed in the same plane. If technically feasible, any extension to facilitate the sampling or connection with the exhaust mass flow meter shall have an equivalent, or larger, cross sectional area than the exhaust pipe.
3.4.3. Exhaust mass flow meter
Whenever used, the exhaust mass flow meter shall be attached to the vehicle’s tailpipe(s) in accordance with the recommendations of the EFM manufacturer. The measurement range of the EFM shall match the range of the exhaust mass flow rate expected during the test. It is recommended to select the EFM so that the maximum expected flow rate during the test reaches at least 75 per cent of the EFM full range but does not exceed the EFM full range. The installation of the EFM and any exhaust pipe adaptors or junctions shall not adversely affect the operation of the engine or exhaust after-treatment system. A minimum of four pipe diameters or 150 mm of straight tubing, whichever is larger, shall be placed at either side of the flow-sensing element. When testing a multi-cylinder engine with a branched exhaust manifold, it is recommended to position the exhaust mass flow meter downstream of where the manifolds combine and to increase the cross section of the piping such as to have an equivalent, or larger, cross sectional area from which to sample. If this is not feasible, exhaust flow measurements with several exhaust mass flow meters may be used. The wide variety of exhaust pipe configurations, dimensions and exhaust mass flow rates may require compromises, guided by good engineering judgement, when selecting and installing the EFM(s). It is permissible to install an EFM with a diameter smaller than that of the exhaust outlet or the total cross-sectional area of multiple outlets, providing it improves measurement accuracy and does not adversely affect the operation or the exhaust after-treatment as specified in paragraph 3.4.2. It is recommended to document the EFM set-up using photographs.
3.4.4. Global Navigation Satellite System (GNSS)
The GNSS antenna shall be mounted as near as possible to the highest location on the vehicle, so as to ensure good reception of the satellite signal. The mounted GNSS antenna shall interfere as little as possible with the vehicle operation.
3.4.5. Connection with the Engine Control Unit (ECU)
If desired, relevant vehicle and engine parameters listed in Table A4/1 can be recorded by using a data logger connected with the ECU or the vehicle network through national or international standards, such as ISO 15031-5 or SAE J1979, OBD-II, EOBD or WWH-OBD. If applicable, manufacturers shall disclose labels to allow the identification of required parameters.
3.4.6. Sensors and auxiliary devices
Vehicle speed sensors, temperature sensors, coolant thermocouples or any other measurement device not part of the vehicle shall be installed to measure the parameter under consideration in a representative, reliable and accurate manner without unduly interfering with the vehicle operation and the functioning of other analysers, flow-measuring instruments, sensors and signals. Sensors and auxiliary equipment shall be powered independently of the vehicle. It is permitted to power any safety-related illumination of fixtures and installations of PEMS components outside of the vehicle’s cabin by the vehicle’s battery.
3.5. Emissions sampling
Emissions sampling shall be representative and conducted at locations of well-mixed exhaust, where the influence of ambient air downstream of the sampling point is minimal. If applicable, emissions shall be sampled downstream of the exhaust mass flow meter, respecting a distance of at least 150 mm to the flow sensing element. The sampling probes shall be fitted at least 200 mm or three times the inner diameter of the exhaust pipe, whichever is larger, upstream of the point at which the exhaust gas exits the PEMS sampling installation into the environment.
If the PEMS feeds part of the sample back to the exhaust flow, this shall occur downstream of the sampling probe in a manner that does not affect the nature of the exhaust gas at the sampling point(s). If the length of the sampling line is changed, the system transport times shall be verified and, if necessary, corrected. If the vehicle is equipped with more than one tailpipe then all functioning tailpipes shall be connected before sampling and measuring exhaust flow.
If the engine is equipped with an exhaust after-treatment system, the exhaust sample shall be taken downstream of the exhaust after-treatment system. When testing a vehicle with a branched exhaust manifold, the inlet of the sampling probe shall be located sufficiently far downstream so as to ensure that the sample is representative of the average exhaust emissions of all cylinders. In multi-cylinder engines, having distinct groups of manifolds, such as in a ‘V’ engine configuration, the sampling probe shall be positioned downstream of where the manifolds combine. If this is technically not feasible, multi-point sampling at locations of well-mixed exhaust may be used. In this case, the number and location of sampling probes shall match as far as possible those of the exhaust mass flow meters. In case of unequal exhaust flows, proportional sampling or sampling with multiple analysers shall be considered.
If particles are measured, they shall be sampled from the centre of the exhaust stream. If several probes are used for emissions sampling, the particle sampling probe should be placed upstream of the other sampling probes. The particle sampling probe should not interfere with the sampling of gaseous pollutants. The type and specifications of the probe and its mounting shall be documented in detail (e.g. L type or 45° cut, internal diameter, with or without hat, etc).
If hydrocarbons are measured, the sampling line shall be heated to 463 ± 10 K (190 ± 10 °C). For the measurement of other gaseous components, with or without cooler, the sampling line shall be kept at a minimum of 333 K (60 °C) to avoid condensation and to ensure appropriate penetration efficiencies of the various gases. For low pressure sampling systems, the temperature can be lowered correspondingly to the pressure decrease provided that the sampling system ensures a penetration efficiency of 95 per cent for all regulated gaseous pollutants. If particles are sampled and not diluted at the tailpipe, the sampling line from the raw exhaust sample point to the point of dilution or particle detector shall be heated to a minimum of 373 K (100 °C). The residence time of the sample in the particle sampling line shall be less than 3 s until reaching first dilution or the particle detector.
All parts of the sampling system from the tailpipe up to the particle detector, which are in contact with raw or diluted exhaust gas, shall be designed to minimize deposition of particles. All parts shall be made from antistatic material to prevent electrostatic effects.
4. Pre-test procedures
4.1. PEMS leak check
After the installation of the PEMS is completed, a leak check shall be performed at least once for each PEMS-vehicle installation as prescribed by the PEMS manufacturer or as follows. The probe shall be disconnected from the exhaust system and the end plugged. The analyser pump shall be switched on. After an initial stabilization period, all flow meters shall read approximately zero in the absence of a leak. If this is not the case the sampling lines shall be checked and the fault shall be corrected.
The leakage rate on the vacuum side shall not exceed 0.5 per cent of the in-use flow rate for the portion of the system being checked. The analyser flows and bypass flows may be used to estimate the in-use flow rate.
Alternatively, the system may be evacuated to a pressure of at least 20 kPa vacuum (80 kPa absolute). After an initial stabilization period the pressure increase Δp (kPa/min) in the system shall not exceed:
qvs is the volume flow rate of the system [l/min].
Alternatively, a concentration step change at the beginning of the sampling line shall be introduced by switching from zero to span gas while maintaining the same pressure conditions as under normal system operation. If for a correctly calibrated analyser after an adequate period of time the reading is ≤ 99 per cent compared to the introduced concentration, the leakage problem shall be corrected.
4.2. Starting and stabilizing the PEMS
The PEMS shall be switched on, warmed up and stabilized in accordance with the specifications of the PEMS manufacturer until key functional parameters (e.g., pressures, temperatures and flows) have reached their operating set points before test start. To ensure correct functioning, the PEMS may be kept switched on or can be warmed up and stabilized during vehicle conditioning. The system shall be free of errors and critical warnings.
4.3. Preparing the sampling system
The sampling system, consisting of the sampling probe and sampling lines shall be prepared for testing by following the instruction of the PEMS manufacturer. It shall be ensured that the sampling system is clean and free of moisture condensation.
4.4. Preparing the Exhaust mass Flow Meter (EFM)
If used for measuring the exhaust mass flow, the EFM shall be purged and prepared for operation in accordance with the specifications of the EFM manufacturer. This procedure shall, if applicable, remove condensation and deposits from the lines and the associated measurement ports.
4.5. Checking and calibrating the analysers for measuring gaseous emissions
Zero and span calibration adjustments of the analysers shall be performed using calibration gases that meet the requirements of paragraph 5. of Annex 5. The calibration gases shall be chosen to match the range of pollutant concentrations expected during the RDE test. To minimise analyser drift, it is recommended to conduct the zero and span calibration of analysers at an ambient temperature that resembles, as closely as possible, the temperature experienced by the test equipment during the trip.
4.6. Checking the analyser for measuring particle emissions
The zero level of the analyser shall be recorded by sampling HEPA filtered ambient air at an appropriate sampling point, ideally at the inlet of the sampling line. The signal shall be recorded at a constant frequency which is a multiple of 1.0 Hz averaged over a period of 2 minutes. The final concentration shall be within the manufacturer’s specifications, but shall not exceed 5,000 particles per cubic-centimetre.
4.7. Determining vehicle speed
Vehicle speed shall be determined by at least one of the following methods:
(a) A sensor (e.g., optical or micro-wave sensor); if vehicle speed is determined by a sensor, the speed measurements shall comply with the requirements of paragraph 8. of Annex 5, or alternatively, the total trip distance determined by the sensor shall be compared with a reference distance obtained from a digital road network or topographic map. The total trip distance determined by the sensor shall deviate by no more than 4 per cent from the reference distance.
(b) The ECU; if vehicle speed is determined by the ECU, the total trip distance shall be validated according to paragraph 3. of Annex 6 and the ECU speed signal adjusted, if necessary, to fulfil the requirements of paragraph 3. of Annex 6. Alternatively, the total trip distance as determined by the ECU can be compared with a reference distance obtained from a digital road network or topographic map. The total trip distance determined by the ECU shall deviate by no more than 4 per cent from the reference distance.
(c) A GNSS; if vehicle speed is determined by a GNSS, the total trip distance shall be checked against the measurements of another method according to paragraph 6.5. of Annex 4.
4.8. Check of PEMS set up
The correctness of connections with all sensors and, if applicable, the ECU shall be verified. If engine parameters are retrieved, it shall be ensured that the ECU reports values correctly (e.g., zero engine speed [rpm] while the combustion engine is in key-on-engine-off status). The PEMS shall function free of errors and critical warnings.
5. Emissions test
5.1. Test start
Sampling, measurement and recording of parameters shall begin prior to the test start (as defined in paragraph 3.8.5. of this Regulation). Before the test start it shall be confirmed that all necessary parameters are recorded by the data logger.
To facilitate time alignment, it is recommended to record the parameters that are subject to time alignment either by a single data recording device or with a synchronised time stamp.
5.2. Test
Sampling, measurement and recording of parameters shall continue throughout the on-road test of the vehicle. The engine may be stopped and started, but emissions sampling and parameter recording shall continue. Repeated stalling of the engine (i.e. unintentional stopping of the engine) should be avoided during an RDE trip. Any warning signals, suggesting malfunctioning of the PEMS, shall be documented and verified. If any error signal(s) appear during the test, the test shall be invalid. Parameter recording shall reach a data completeness of higher than 99 per cent. Measurement and data recording may be interrupted for less than 1 per cent of the total trip duration but for no more than a consecutive period of 30 s solely in the case of unintended signal loss or for the purpose of PEMS system maintenance. Interruptions may be recorded directly by the PEMS but it is not permissible to introduce interruptions in the recorded parameter via the pre-processing, exchange or post-processing of data. If conducted, auto zeroing shall be performed against a traceable zero standard similar to the one used to zero the analyser. It is strongly recommended to initiate PEMS system maintenance during periods of zero vehicle speed.
5.3. Test end
Excessive idling of the engine after the completion of the trip shall be avoided. The data recording shall continue after the test end (as defined in paragraph 3.8.6. of this Regulation) and until the response time of the sampling systems has elapsed. For vehicles with a signal detecting regeneration, the OBD-check shall be performed and documented directly after data recording and before any further driven distance is driven.
6. Post-test procedure
6.1. Checking the analysers for measuring gaseous emissions
The zero and span of the analysers of gaseous components shall be checked by using calibration gases identical to the ones applied under paragraph 4.5. to evaluate the analyser's zero and response drift compared to the pre-test calibration. It is permissible to zero the analyser prior to verifying the span drift, if the zero drift was determined to be within the permissible range. The post-test drift check shall be completed as soon as possible after the test and before the PEMS, or individual analysers or sensors, are turned off or have switched into a non-operating mode. The difference between the pre-test and post-test results shall comply with the requirements specified in Table A4/2.
≤ 2 % of reading or ≤ 2000 ppm per test, whichever is larger
CO
≤ 75 ppm per test
≤ 2 % of reading or ≤ 75 ppm per test, whichever is larger
NOX
≤ 3 ppm per test
≤ 2 % of reading or ≤ 3 ppm per test, whichever is larger
CH4
≤ 10 ppm C1 per test
≤ 2 % of reading or ≤ 10 ppm C1 per test, whichever is larger
THC
≤ 10 ppm C1 per test
≤ 2 % of reading or ≤ 10 ppm C1 per test, whichever is larger
If the difference between the pre-test and post-test results for the zero and span drift is higher than permitted, all test results shall be invalid and the test repeated.
6.2. Checking the analyser for measuring particle emissions
The zero level of the analyser shall be recorded in accordance with paragraph 4.6.
6.3. Checking the on-road emission measurements
The span gas concentration that was used for the calibration of the analysers in accordance with paragraph 4.5. at the test start shall cover at least 90 per cent of the concentration values obtained from 99 per cent of the measurements of the valid parts of the emissions test. It is permissible that 1 per cent of the total number of measurements used for evaluation exceeds the concentration of the span gas used by up to a factor of two. If these requirements are not met, the test shall be invalid.
6.4. Consistency check of vehicle altitude
In case altitude has only been measured with a GNSS, the GNSS altitude data shall be checked for consistency and, if necessary, corrected. The consistency of data shall be checked by comparing the latitude, longitude and altitude data obtained from the GNSS with the altitude indicated by a digital terrain model or a topographic map of suitable scale. Measurements that deviate by more than 40 m from the altitude depicted in the topographic map shall be manually corrected. The original and uncorrected data shall be retained and any corrected data shall be marked.
The instantaneous altitude data shall be checked for completeness. Data gaps shall be completed by data interpolation. The correctness of interpolated data shall be verified by a topographic map. It is recommended to correct interpolated data if the following condition applies:
vehicle altitude after the screening and principle check of data quality at data point t [m above sea level]
hGNSS(t)
—
vehicle altitude measured with GNSS at data point t [m above sea level]
hmap(t)
—
vehicle altitude based on topographic map at data point t [m above sea level]
6.5. Consistency check of GNSS vehicle speed
The vehicle speed as determined by the GNSS shall be checked for consistency by calculating and comparing the total trip distance with reference measurements obtained from either a sensor, the validated ECU or, alternatively, from a digital road network or topographic map. It is mandatory to correct GNSS data for obvious errors, e.g., by applying a dead reckoning sensor, prior to the consistency check. The original and uncorrected data shall be retained and any corrected data shall be marked. The corrected data shall not exceed an uninterrupted time period of 120 s or a total of 300 s. The total trip distance as calculated from the corrected GNSS data shall deviate by no more than 4 per cent from the reference. If the GNSS data do not meet these requirements and no other reliable speed source is available, the test shall be invalid.
6.6. Consistency check of the ambient temperature
The ambient temperature data shall be checked for consistency and inconsistent values corrected by substituting outliers with the average of the neighbouring values. The original and uncorrected data shall be retained and any corrected data shall be marked.
Annex 5
Specifications and calibration of PEMS components and signals
1. Introduction
This annex sets out the specifications and calibration of PEMS components and signals.
2. Symbols, Parameters and Units
A
—
undiluted CO2 concentration [%]
a0
—
y-axis intercept of the linear regression line
a1
—
slope of the linear regression line
B
—
diluted CO2 concentration [%]
C
—
diluted NO concentration [ppm]
c
—
analyser response in the oxygen interference test
Cb
Measured diluted NO concentration through bubbler
cFS,b
—
full scale HC concentration in step (b) [ppmC1]
cFS,d
—
full scale HC concentration in step (d) [ppmC1]
cHC(w/NMC)
—
HC concentration with CH4 or C2H6 flowing through the NMC [ppmC1]
cHC(w/o NMC)
—
HC concentration with CH4 or C2H6 bypassing the NMC [ppmC1]
cm,b
—
measured HC concentration in step (b) [ppmC1]
cm,d
—
measured HC concentration in step (d) [ppmC1]
cref,b
—
reference HC concentration in step (b) [ppmC1]
cref,d
—
reference HC concentration in step (d) [ppmC1]
D
—
undiluted NO concentration [ppm]
De
—
expected diluted NO concentration [ppm]
E
—
absolute operating pressure [kPa]
ECO2
—
per cent CO2 quench
E(dp)
—
PEMS-PN analyser efficiency
EE
—
ethane efficiency
EH2O
—
per cent water quench
EM
—
methane efficiency
EO2
—
oxygen interference
F
—
water temperature [K]
G
—
saturation vapour pressure [kPa]
H
—
water vapour concentration [%]
Hm
—
maximum water vapour concentration [%]
NOX,dry
—
moisture-corrected mean concentration of the stabilized NOX recordings
NOX,m
—
mean concentration of the stabilized NOX recordings
NOX,ref
—
reference mean concentration of the stabilized NOX recordings
r2
—
coefficient of determination
t0
—
time point of gas flow switching [s]
t10
—
time point of 10 % response of the final reading
t50
—
time point of 50 % response of the final reading
t90
—
time point of 90 % response of the final reading
Tbd
—
to be determined
X
—
independent variable or reference value
xmin
—
minimum value
Y
—
dependent variable or measured value
3. Linearity verification
3.1. General
The accuracy and linearity of analysers, flow-measuring instruments, sensors and signals shall be traceable to international or national standards. Any sensors or signals that are not directly traceable (e.g., simplified flow-measuring instruments) shall be calibrated alternatively against chassis dynamometer laboratory equipment that has been calibrated against international or national standards.
3.2. Linearity requirements
All analysers, flow-measuring instruments, sensors and signals shall comply with the linearity requirements given in Table A5/1. If air flow, fuel flow, the air-to-fuel ratio or the exhaust mass flow rate is obtained from the ECU, the calculated exhaust mass flow rate shall meet the linearity requirements specified in Table A5/1.
Table A5/1
Linearity requirements of measurement parameters and systems
The linearity requirements pursuant to paragraph 3.2. shall be verified:
(a) For each gas analyser at least every 12 months or whenever a system repair or component change or modification is made that could influence the calibration;
(b) For other relevant instruments, such as PN analysers, exhaust mass flow meters and traceably calibrated sensors, whenever damage is observed, as required by internal audit procedures or by the instrument manufacturer but no longer than one year before the actual test.
The linearity requirements pursuant to paragraph 3.2. for sensors or ECU signals that are not directly traceable shall be performed using a measurement device with a traceable calibration on the chassis dynamometer, once for each PEMS-vehicle setup.
3.4. Procedure of linearity verification
3.4.1. General requirements
The relevant analysers, instruments and sensors shall be brought to their normal operating condition according to the recommendations of their manufacturer. The analysers, instruments and sensors shall be operated at their specified temperatures, pressures and flows.
3.4.2. General procedure
The linearity shall be verified for each normal operating range by executing the following steps:
(a) The analyser, flow-measuring instrument or sensor shall be set to zero by introducing a zero signal. For gas analysers, purified synthetic air or nitrogen shall be introduced to the analyser port via a gas path that is as direct and short as possible.
(b) The analyser, flow-measuring instrument or sensor shall be spanned by introducing a span signal. For gas analysers, an appropriate span gas shall be introduced to the analyser port via a gas path that is as direct and short as possible.
(c) The zero procedure of (a) shall be repeated.
(d) The linearity shall be verified by introducing at least 10, approximately equally spaced and valid, reference values (including zero). The reference values with respect to the concentration of components, the exhaust mass flow rate or any other relevant parameter shall be chosen to match the range of values expected during the emissions test. For measurements of exhaust mass flow, reference points below 5 per cent of the maximum calibration value can be excluded from the linearity verification.
(e) For gas analysers, known gas concentrations in accordance with paragraph 5. shall be introduced to the analyser port. Sufficient time for signal stabilisation shall be given. For particle number analysers, the particle number concentrations shall be at least two times the limit of detection (defined in paragraph 6.2.).
(f) The values under evaluation and, if needed, the reference values shall be recorded at a constant frequency which is a multiple of 1.0 Hz over a period of 30 seconds (60 s for particle number analysers).
(g) The arithmetic mean values over the 30 seconds (or 60 s) period shall be used to calculate the least squares linear regression parameters, with the best-fit equation having the form:
The standard error of estimate (SEE) of y on x and the coefficient of determination (r2) shall be calculated for each measurement parameter and system.
(h) The linear regression parameters shall meet the requirements specified in Table A5/1.
3.4.3. Requirements for linearity verification on a chassis dynamometer
Non-traceable flow-measuring instruments, sensors or ECU signals, that cannot directly be calibrated according to traceable standards, shall be calibrated on a chassis dynamometer. The procedure shall follow, as far as applicable, the requirements of UN Regulation No. 154 on WLTP. If necessary, the instrument or sensor to be calibrated shall be installed on the test vehicle and operated according to the requirements of Annex 4. The calibration procedure shall follow whenever possible the requirements of paragraph 3.4.2. At least 10 appropriate reference values shall be selected as to ensure that at least 90 per cent of the maximum value expected to occur during the RDE test is covered.
If a non-traceable flow-measuring instrument, sensor or ECU signal for determining exhaust flow is to be calibrated, a reference exhaust mass flow meter with traceable calibration or the CVS shall be attached to the vehicle’s tailpipe. It shall be ensured that the vehicle exhaust is accurately measured by the exhaust mass flow meter according to paragraph 3.4.3. of Annex 4. The vehicle shall be operated by applying constant throttle at a constant gear selection and chassis dynamometer load.
4. Analysers for measuring gaseous components
4.1. Permissible types of analysers
4.1.1. Standard analysers
The gaseous components shall be measured with analysers specified in paragraph 4.1.4., Annex B5 to UN Regulation No. 154 on WLTP. If an NDUV analyser measures both NO and NO2, a NO2/NO converter is not required.
4.1.2. Alternative analysers
Any analyser not meeting the design specifications of paragraph 4.1.1. is permissible provided that it fulfils the requirements of paragraph 4.2. The manufacturer shall ensure that the alternative analyser achieves an equivalent or higher measurement performance compared to a standard analyser over the range of pollutant concentrations and co-existing gases that can be expected from vehicles operated with permissible fuels under moderate and extended conditions of valid RDE testing as specified in paragraphs 5., 6. and 7. of this annex. Upon request, the manufacturer of the analyser shall submit in writing supplemental information, demonstrating that the measurement performance of the alternative analyser is consistently and reliably in line with the measurement performance of standard analysers. Supplemental information shall contain:
(a) A description of the theoretical basis and the technical components of the alternative analyser;
(b) A demonstration of equivalency with the respective standard analyser specified in paragraph 4.1.1. over the expected range of pollutant concentrations and ambient conditions of the type-approval test defined in UN Regulation No. 154 on WLTP as well as a validation test as described in paragraph 3. of Annex 6 for a vehicle equipped with a spark-ignition and compression-ignition engine; the manufacturer of the analyser shall demonstrate the significance of equivalency within the permissible tolerances given in paragraph 3.3. of Annex 6.
(c) A demonstration of equivalency with the respective standard analyser specified in paragraph 4.1.1. with respect to the influence of atmospheric pressure on the measurement performance of the analyser; the demonstration test shall determine the response to span gas having a concentration within the analyser range to check the influence of atmospheric pressure under moderate and extended altitude conditions defined in paragraph 5.2. Such a test can be performed in an altitude environmental test chamber.
(d) A demonstration of equivalency with the respective standard analyser specified in paragraph 4.1.1. over at least three on-road tests that fulfil the requirements of this Annex.
(e) A demonstration that the influence of vibrations, accelerations and ambient temperature on the analyser reading does not exceed the noise requirements for analysers set out in paragraph 4.2.4.
Approval authorities may request additional information to substantiate equivalency or refuse approval if measurements demonstrate that an alternative analyser is not equivalent to a standard analyser.
4.2. Analyser specifications
4.2.1. General
In addition to the linearity requirements defined for each analyser in paragraph 3., the compliance of analyser types with the specifications laid down in paragraphs 4.2.2. to 4.2.8. shall be demonstrated by the analyser manufacturer. Analysers shall have a measuring range and response time appropriate to measure with adequate accuracy the concentrations of the exhaust gas components at the applicable emissions standard under transient and steady state conditions. The sensitivity of the analysers to shocks, vibration, aging, variability in temperature and air pressure as well as electromagnetic interferences and other impacts related to vehicle and analyser operation shall be limited as far as possible.
4.2.2. Accuracy
The accuracy, defined as the deviation of the analyser reading from the reference value, shall not exceed 2 per cent of reading or 0.3 per cent of full scale, whichever is larger.
4.2.3. Precision
The precision, defined as 2.5 times the standard deviation of 10 repetitive responses to a given calibration or span gas, shall be no greater than 1 per cent of the full scale concentration for a measurement range equal or above 155 ppm (or ppmC1) and 2 per cent of the full scale concentration for a measurement range of below 155 ppm (or ppmC1).
4.2.4. Noise
The noise shall not exceed 2 per cent of full scale. Each of the 10 measurement periods shall be interspersed with an interval of 30 seconds in which the analyser is exposed to an appropriate span gas. Before each sampling period and before each span period, sufficient time shall be given to purge the analyser and the sampling lines.
4.2.5. Zero response drift
The drift of the zero response, defined as the mean response to a zero gas during a time interval of at least 30 seconds, shall comply with the specifications given in Table A5/2.
4.2.6. Span response drift
The drift of the span response, defined as the mean response to a span gas during a time interval of at least 30 seconds, shall comply with the specifications given in Table A5/2.
Table A5/2 Permissible zero and span response drift of analysers for measuring gaseous components under laboratory conditions
Pollutant
Absolute Zero response drift
Absolute Span response drift
CO2
≤ 1000 ppm over 4 h
≤ 2 % of reading or ≤ 1000 ppm over 4 h, whichever is larger
CO
≤ 50 ppm over 4 h
≤ 2 % of reading or ≤ 50 ppm over 4 h, whichever is larger
PN
5000 particles per cubic centimetre over 4 h
According to manufacturer specifications
NOX
≤ 3 ppm over 4 h
≤ 2 % of reading or 3 ppm over 4 h, whichever is larger
CH4
≤ 10 ppm C1
≤ 2 % of reading or ≤ 10 ppm C1 over 4 h, whichever is larger
THC
≤ 10 ppm C1
≤ 2 % of reading or ≤ 10 ppm C1 over 4 h, whichever is larger
4.2.7. Rise time
The rise time, defined as the time between the 10 per cent and 90 per cent response of the final reading (t10 to t90; see paragraph 4.4.), shall not exceed 3 seconds.
4.2.8. Gas drying
Exhaust gases may be measured wet or dry. A gas-drying device, if used, shall have a minimal effect on the composition of the measured gases. Chemical dryers are not permitted.
4.3. Additional requirements
4.3.1. General
The provisions in paragraphs 4.3.2. to 4.3.5. define additional performance requirements for specific analyser types and apply only to cases in which the analyser under consideration is used for RDE emission measurements.
4.3.2. Efficiency test for NOX converters
If a NOX converter is applied, for example to convert NO2 into NO for analysis with a chemiluminescence analyser, its efficiency shall be tested by following the requirements in paragraph 5.5. of Annex B5 to UN Regulation No. 154 on WLTP. The efficiency of the NOX converter shall be verified no longer than one month before the emissions test.
4.3.3. Adjustment of the Flame Ionisation Detector (FID)
(a) Optimization of the detector response
If hydrocarbons are measured, the FID shall be adjusted as specified by the instrument manufacturer by following paragraph 5.4.1. of Annex B5 to UN Regulation No. 154 on WLTP. A propane-in-air or propane-in-nitrogen span gas shall be used to optimize the response in the most common operating range.
(b) Hydrocarbon response factors
If hydrocarbons are measured, the hydrocarbon response factor of the FID shall be verified by following the provisions of paragraph 5.4.3. of Annex B5 to UN Regulation No. 154 on WLTP, using propane-in-air or propane-in-nitrogen as span gases and purified synthetic air or nitrogen as zero gases, respectively.
(c) Oxygen interference check
The oxygen interference check shall be performed when introducing a FID into service and after major maintenance intervals. A measuring range shall be chosen in which the oxygen interference check gases fall in the upper 50 per cent. The test shall be conducted with the oven temperature set as required. The specifications of the oxygen interference check gases are described in paragraph 5.3.
The following procedure applies:
(i) The analyser shall be set at zero;
(ii) The analyser shall be spanned with a 0 per cent oxygen blend for positive ignition engines and a 21 per cent oxygen blend for compression ignition engines;
(iii) The zero response shall be rechecked. If it has changed by more than 0.5 per cent of full scale, steps (i) and (ii) shall be repeated;
(iv) The 5 per cent and 10 per cent oxygen interference check gases shall be introduced;
(v) The zero response shall be rechecked. If it has changed by more than ±1 per cent of full scale, the test shall be repeated;
(vi) The oxygen interference EO2 [%] shall be calculated for each oxygen interference check gas in step (iv) as follows:
is the reference HC concentration in step (ii) [ppmC1]
cref,d
is the reference HC concentration in step (iv) [ppmC1]
cFS,b
is the full scale HC concentration in step (ii) [ppmC1]
cFS,d
is the full scale HC concentration in step (iv) [ppmC1]
cm,b
is the measured HC concentration in step (ii) [ppmC1]
cm,d
is the measured HC concentration in step (iv) [ppmC1]
(vii) The oxygen interference EO2 shall be less than ±1.5 per cent for all required oxygen interference check gases.
(viii) If the oxygen interference EO2 is higher than ±1.5 per cent, corrective action may be taken by incrementally adjusting the air flow (above and below the manufacturer's specifications), the fuel flow and the sample flow.
(ix) The oxygen interference check shall be repeated for each new setting.
4.3.4. Conversion efficiency of the non-methane cutter (NMC)
If hydrocarbons are analysed, a NMC can be used to remove non-methane hydrocarbons from the gas sample by oxidizing all hydrocarbons except methane. Ideally, the conversion for methane is 0 per cent and for the other hydrocarbons, represented by ethane, is 100 per cent. For the accurate measurement of NMHC, the two efficiencies shall be determined and used for the calculation of the NMHC emissions (see paragraph 6.2. of Annex 7). It is not necessary to determine the methane conversion efficiency in the case where the NMC-FID is calibrated according to method (b) in paragraph 6.2. of Annex 7 by passing the methane/air calibration gas through the NMC.
(a) Methane conversion efficiency
Methane calibration gas shall be flowed through the FID with and without bypassing the NMC; the two concentrations shall be recorded. The methane efficiency shall be determined as:
is the HC concentration with CH4 flowing through the NMC [ppmC1]
cHC(w/o NMC)
is the HC concentration with CH4 bypassing the NMC [ppmC1]
(b) Ethane conversion efficiency
Ethane calibration gas shall be flowed through the FID with and without bypassing the NMC; the two concentrations shall be recorded. The ethane efficiency shall be determined as:
is the HC concentration with C2H6 flowing through the NMC [ppmC1]
cHC(w/o NMC)
is the HC concentration with C2H6 bypassing the NMC [ppmC1]
4.3.5. Interference effects
(a) General
Other gases than the ones being analysed can affect the analyser reading. A check for interference effects and the correct functionality of analysers shall be performed by the analyser manufacturer prior to market introduction at least once for each type of analyser or device addressed in paragraphs 4.3.5. (b) to (f).
(b) CO analyser interference check
Water and CO2 can interfere with the measurements of the CO analyser. Therefore, a CO2 span gas, having a concentration of 80 to 100 per cent of the full scale of the maximum operating range of the CO2 analyser used during the test, shall be bubbled through water at room temperature and the analyser response recorded. The analyser response shall not be more than 2 per cent of the mean CO concentration expected during normal on-road testing or ± 50 ppm, whichever is larger. The interference check for H2O and CO2 may be run as separate procedures. If the H2O and CO2 levels used for the interference check are higher than the maximum levels expected during the test, each observed interference value shall be scaled down by multiplying the observed interference with the ratio of the maximum expected concentration value during the test and the actual concentration value used during this check. Separate interference checks with concentrations of H2O that are lower than the maximum concentration expected during the test may be run and the observed H2O interference shall be scaled up by multiplying the observed interference with the ratio of the maximum H2O concentration value expected during the test and the actual concentration value used during this check. The sum of the two scaled interference values shall meet the tolerance specified in this point.
(c) NOX analyser quench check
The two gases of concern for CLD and HCLD analysers are CO2 and water vapour. The quench response to these gases is proportional to the gas concentrations. A test shall determine the quench at the highest concentrations expected during the test. If the CLD and HCLD analysers use quench compensation algorithms that utilize H2O or CO2 measurement analysers or both, quench shall be evaluated with these analysers active and with the compensation algorithms applied.
(i) CO2 quench check
A CO2 span gas having a concentration of 80 to 100 per cent of the maximum operating range shall be passed through the NDIR analyser; the CO2 value shall be recorded as A. The CO2 span gas shall then be diluted by approximately 50 per cent with NO span gas and passed through the NDIR and CLD or HCLD; the CO2 and NO values shall be recorded as B and C, respectively. The CO2 gas flow shall then be shut off and only the NO span gas shall be passed through the CLD or HCLD; the NO value shall be recorded as D. The per cent quench shall be calculated as:
is the undiluted CO2 concentration measured with the NDIR [%]
B
is the diluted CO2 concentration measured with the NDIR [%]
C
is the diluted NO concentration measured with the CLD or HCLD [ppm]
D
is the undiluted NO concentration measured with the CLD or HCLD [ppm]
Alternative methods of diluting and quantifying of CO2 and NO span gas values such as dynamic mixing/blending are permitted upon approval of the approval authority.
(ii) Water quench check
This check applies to measurements of wet gas concentrations only. The calculation of water quench shall consider dilution of the NO span gas with water vapour and the scaling of the water vapour concentration in the gas mixture to concentration levels that are expected to occur during an emissions test. A NO span gas having a concentration of 80 per cent to 100 per cent of full scale of the normal operating range shall be passed through the CLD or HCLD; the NO value shall be recorded as D. The NO span gas shall then be bubbled through water at room temperature and passed through the CLD or HCLD; the NO value shall be recorded as Cb. The analyser's absolute operating pressure and the water temperature shall be determined and recorded as E and F, respectively. The mixture's saturation vapour pressure that corresponds to the water temperature of the bubbler F shall be determined and recorded as G. The water vapour concentration H [%] of the gas mixture shall be calculated as:
For diesel exhaust, the maximum concentration of water vapour in the exhaust gas (in per cent) expected during the test shall be recorded as Hm after being estimated, under the assumption of a fuel H/C ratio of 1.8/1, from the maximum CO2 concentration in the exhaust gas A as follows:
The combined CO2 and water quench shall not exceed 2 per cent of full scale.
(d) Quench check for NDUV analysers
Hydrocarbons and water can positively interfere with NDUV analysers by causing a response similar to that of NOX. The manufacturer of the NDUV analyser shall use the following procedure to verify that quench effects are limited:
(i) The analyser and chiller shall be set up by following the operating instructions of the manufacturer; adjustments should be made as to optimise the analyser and chiller performance.
(ii) A zero calibration and span calibration at concentration values expected during emissions testing shall be performed for the analyser.
(iii) A NO2 calibration gas shall be selected that matches as far as possible the maximum NO2 concentration expected during emissions testing.
(iv) The NO2 calibration gas shall overflow at the gas sampling system's probe until the NOX response of the analyser has stabilised.
(v) The mean concentration of the stabilized NOX recordings over a period of 30 s shall be calculated and recorded as NOX,ref.
(vi) The flow of the NO2 calibration gas shall be stopped and the sampling system saturated by overflowing with a dew point generator's output, set at a dew point of 50 °C. The dew point generator's output shall be sampled through the sampling system and chiller for at least 10 minutes until the chiller is expected to be removing a constant rate of water.
(vii) Upon completion of (vi), the sampling system shall again be overflown by the NO2 calibration gas used to establish NOX,ref until the total NOX response has stabilized.
(viii) The mean concentration of the stabilized NOX recordings over a period of 30 s shall be calculated and recorded as NOX,m.
(ix) NOX,m shall be corrected to NOX,dry based upon the residual water vapour that passed through the chiller at the chiller's outlet temperature and pressure.
The calculated NOX,dry shall at least amount to 95 per cent of NOX,ref.
(e) Sample dryer
A sample dryer removes water, which can otherwise interfere with the NOX measurement. For dry CLD analysers, it shall be demonstrated that at the highest expected water vapour concentration Hm the sample dryer maintains the CLD humidity at ≤ 5 g water/kg dry air (or about 0.8 per cent H2O), which is 100 per cent relative humidity at 3.9 °C and 101.3 kPa or about 25 per cent relative humidity at 25 °C and 101.3 kPa. Compliance may be demonstrated by measuring the temperature at the outlet of a thermal sample dryer or by measuring the humidity at a point just upstream of the CLD. The humidity of the CLD exhaust might also be measured as long as the only flow into the CLD is the flow from the sample dryer.
(f) Sample dryer NO2 penetration
Liquid water remaining in an improperly designed sample dryer can remove NO2 from the sample. If a sample dryer is used in combination with a NDUV analyser without an NO2/NO converter upstream, water could therefore remove NO2 from the sample prior to the NOX measurement. The sample dryer shall allow for measuring at least 95 per cent of the NO2 contained in a gas that is saturated with water vapour and consists of the maximum NO2 concentration expected to occur during emission testing.
4.4. Response time check of the analytical system
For the response time check, the settings of the analytical system shall be exactly the same as during the emissions test (i.e. pressure, flow rates, filter settings in the analysers and all other parameters influencing the response time). The response time shall be determined with gas switching directly at the inlet of the sample probe. The gas switching shall be done in less than 0.1 second. The gases used for the test shall cause a concentration change of at least 60 per cent full scale of the analyser.
The concentration trace of each single gas component shall be recorded.
For time alignment of the analyser and exhaust flow signals, the transformation time is defined as the time from the change (t0) until the response is 50 per cent of the final reading (t50).
The system response time shall be ≤ 12 s with a rise time of ≤ 3 seconds for all components and all ranges used. When using a NMC for the measurement of NMHC, the system response time may exceed 12 seconds.
5. Gases
5.1. Calibration and span gases for RDE tests
5.1.1. General
The shelf life of calibration and span gases shall be respected. Pure as well as mixed calibration and span gases shall fulfil the specifications of Annex B5 of UN Regulation No. 154 on WLTP.
5.1.2. NO2 calibration gas
In addition, NO2 calibration gas is permissible. The concentration of the NO2 calibration gas shall be within two per cent of the declared concentration value. The amount of NO contained in the NO2 calibration gas shall not exceed 5 per cent of the NO2 content.
5.1.3. Multicomponent mixtures
Only multicomponent mixtures which fulfil the requirements of paragraph 5.1.1. shall be used. These mixtures may contain two or more of the components. Multicomponent mixtures containing both NO and NO2 are exempted of the NO2 impurity requirement set out in paragraphs 5.1.1. and 5.1.2.
5.2. Gas dividers
Gas dividers (i.e., precision blending devices that dilute with purified N2 or synthetic air) can be used to obtain calibration and span gases. The accuracy of the gas divider shall be such that the concentration of the blended calibration gases is accurate to within ± 2 per cent. The verification shall be performed at between 15 and 50 per cent of full scale for each calibration incorporating a gas divider. An additional verification may be performed using another calibration gas, if the first verification has failed.
Optionally, the gas divider may be checked with an instrument which by nature is linear, e.g. using NO gas in combination with a CLD. The span value of the instrument shall be adjusted with the span gas directly connected to the instrument. The gas divider shall be checked at the settings typically used and the nominal value shall be compared with the concentration measured by the instrument. The difference shall in each point be within ±1 per cent of the nominal concentration value.
5.3. Oxygen interference check gases
Oxygen interference check gases consist of a blend of propane, oxygen and nitrogen and shall contain propane at a concentration of 350 ± 75 ppmC1. The concentration shall be determined by gravimetric methods, dynamic blending or the chromatographic analysis of total hydrocarbons plus impurities. The oxygen concentrations of the oxygen interference check gases shall meet the requirements listed in Table A5/3; the remainder of the oxygen interference check gas shall consist of purified nitrogen.
Table A5/3
Oxygen interference check gases
Engine type
Compression ignition Positive ignition
O2 concentration 21 ± 1 % 10 ± 1 %
10 ± 1 % 5 ± 1 %
5 ± 1 % 0.5 ± 0.5 %
6. Analysers for measuring (solid) particle emissions
This section will define future requirement for analysers for measuring particle number emissions, once their measurement becomes mandatory.
6.1. General
The PN analyser shall consist of a pre-conditioning unit and a particle detector that counts with 50 per cent efficiency from approximately 23 nm. It is permissible that the particle detector also pre-conditions the aerosol. The sensitivity of the analysers to shocks, vibration, aging, variability in temperature and air pressure as well as electromagnetic interferences and other impacts related to vehicle and analyser operation shall be limited as far as possible and shall be clearly stated by the equipment manufacturer in its support material. The PN analyser shall only be used within its manufacturer’s declared parameters of operation. An example of a PN analyser setup is provided in Figure A5/1.
Figure A5/1
Example of a PN analyser setup: Dotted lines depict optional parts. EFM = Exhaust mass Flow Meter, d = inner diameter, PND = Particle Number Diluter.
The PN analyser shall be connected to the sampling point via a sampling probe which extracts a sample from the centreline of the tailpipe tube. As specified in paragraph 3.5. of Annex 4, if particles are not diluted at the tailpipe, the sampling line shall be heated to a minimum temperature of 373 K (100 °C) until the point of first dilution of the PN analyser or the particle detector of the analyser. The residence time in the sampling line shall be less than 3 s.
All parts in contact with the sampled exhaust gas shall be always kept at a temperature that avoids condensation of any compound in the device. This can be achieved for example by heating at a higher temperature and diluting the sample or oxidizing the (semi)volatile species.
The PN analyser shall include a heated section at wall temperature ≥ 573 K. The unit shall control the heated stages to constant nominal operating temperatures, within a tolerance of ± 10 K, and provide an indication of whether or not heated stages are at their correct operating temperatures. Lower temperatures are acceptable as long as the volatile particle removal efficiency fulfils the specifications of paragraph 6.4.
Pressure, temperature and other sensors shall monitor the proper operation of the instrument during operation and trigger a warning or message in case of malfunction.
The delay time of the PN analyser shall be ≤ 5 s.
The PN analyser (and/or particle detector) shall have a rise time of ≤ 3.5 s.
Particle concentration measurements shall be reported normalised to 273 K and 101.3 kPa. If necessary, the pressure and/or temperature at the inlet of the detector shall be measured and reported for the purposes of normalizing the particle concentration.
PN systems that comply with the calibration requirements of UN Regulation Nos 83 or 49 or UN Regulation No. 154 on WLTP automatically comply with the calibration requirements of this annex.
6.2. Efficiency requirements
The complete PN analyser system including the sampling line shall fulfil the efficiency requirements of Table A5/3a.
Table A5/3a
PN analyser (including the sampling line) system efficiency requirements
dp [nm]
Sub-23
23
30
50
70
100
200
E(dp) PN analyser
To be determined
0.2 – 0.6
0.3 – 1.2
0.6 – 1.3
0.7 – 1.3
0.7 – 1.3
0.5 – 2.0
Efficiency E(dp) is defined as the ratio in the readings of the PN analyser system to a reference Condensation Particle Counter (CPC)’s (d50 % = 10 nm or lower, checked for linearity and calibrated with an electrometer) or an Electrometer’s number concentration measuring in parallel monodisperse aerosol of mobility diameter dp and normalized at the same temperature and pressure conditions.
The material should be thermally stable soot-like (e.g. spark discharged graphite or diffusion flame soot with thermal pre-treatment). If the efficiency curve is measured with a different aerosol (e.g. NaCl), the correlation to the soot-like curve must be provided as a chart which compares the efficiencies obtained using both test aerosols. The differences in the counting efficiencies shall be taken into account by adjusting the measured efficiencies based on the provided chart to give soot-like aerosol efficiencies. The correction for multiply charged particles shall be applied and documented but shall not exceed 10 per cent. These efficiencies refer to the PN analysers with the sampling line. The PN analyser can also be calibrated in parts (i.e. the pre-conditioning unit separately from the particle detector) as long as it is proven that the PN analyser and the sampling line together fulfil the requirements of Table A5/3a. The measured signal from the detector shall be > 2 times the limit of detection (here defined as the zero level plus 3 standard deviations).
6.3. Linearity requirements
The PN analyser including the sampling line shall fulfil the linearity requirements of paragraph 3.2. of Annex 5 using monodisperse or polydisperse soot-like particles. The particle size (mobility diameter or count median diameter) shall be larger than 45 nm. The reference instrument shall be an Electrometer or a Condensation Particle Counter (CPC) with d50 = 10 nm or lower, verified for linearity. Alternatively, a particle number system compliant with UN Regulation No. 154 on WLTP.
In addition, the differences of the PN analyser from the reference instrument at all points checked (except the zero point) shall be within 15 per cent of their mean value. At least 5 points equally distributed (plus the zero) shall be checked. The maximum checked concentration shall be > 90 per cent of the PN analyser nominal measurement range.
If the PN analyser is calibrated in parts, then the linearity can be checked only for the PN detector, but the efficiencies of the rest parts and the sampling line shall be considered in the slope calculation.
6.4. Volatile removal efficiency
The system shall achieve > 99 per cent removal of ≥ 30 nm tetracontane (CH3(CH2)38CH3) particles with an inlet concentration of ≥ 10000 particles per cubic-centimetre at the minimum dilution.
The system shall also achieve a > 99 per cent removal efficiency of tetracontane with count median diameter > 50 nm and mass > 1 mg/m3.
The volatile removal efficiency with tetracontane shall be proven only once for the instrument family. The instrument manufacturer though shall provide the maintenance or replacement interval that ensures that the removal efficiency does not drop below the technical requirements. If such information is not provided, the volatile removal efficiency shall be checked yearly for each instrument.
7. Instruments for measuring exhaust mass flow
7.1. General
Instruments or signals for measuring the exhaust mass flow rate shall have a measuring range and response time appropriate for the accuracy required to measure the exhaust mass flow rate under transient and steady state conditions. The sensitivity of instruments and signals to shocks, vibration, aging, variability in temperature, ambient air pressure, electromagnetic interferences and other impacts related to vehicle and instrument operation shall be on a level as to eliminate additional errors.
7.2. Instrument specifications
The exhaust mass flow rate shall be determined by a direct measurement method applied in either of the following instruments:
(a) Pitot-based flow devices;
(b) Pressure differential devices like flow nozzle (details see ISO 5167);
(c) Ultrasonic flow meter;
(d) Vortex flow meter.
Each individual exhaust mass flow meter shall fulfil the linearity requirements set out in paragraph 3. Furthermore, the instrument manufacturer shall demonstrate the compliance of each type of exhaust mass flow meter with the specifications in paragraphs 7.2.3. to 7.2.9.
It is permissible to calculate the exhaust mass flow rate based on air flow and fuel flow measurements obtained from sensors with traceable calibration if these fulfil the linearity requirements of paragraph 3., the accuracy requirements of paragraph 8. and if the resulting exhaust mass flow rate is validated according to paragraph 4. of Annex 6.
In addition, other methods that determine the exhaust mass flow rate based on non-traceable instruments and signals, such as simplified exhaust mass flow meters or ECU signals, are permissible if the resulting exhaust mass flow rate fulfils the linearity requirements of paragraph 3. and is validated according to paragraph 4. of Annex 6.
7.2.1. Calibration and verification standards
The measurement performance of exhaust mass flow meters shall be verified with air or exhaust gas against a traceable standard such as a calibrated exhaust mass flow meter or a full flow dilution tunnel.
7.2.2. Frequency of verification
The compliance of exhaust mass flow meters with paragraphs 7.2.3. to 7.2.9. shall be verified no longer than one year before the actual test.
7.2.3. Accuracy
The accuracy of the EFM, defined as the deviation of the EFM reading from the reference flow value, shall not exceed ± 3 per cent of the reading, or 0.3 per cent of full scale, whichever is larger.
7.2.4. Precision
The precision, defined as 2.5 times the standard deviation of 10 repetitive responses to a given nominal flow, approximately in the middle of the calibration range, shall not exceed 1 per cent of the maximum flow at which the EFM has been calibrated.
7.2.5. Noise
The noise shall not exceed 2 per cent of the maximum calibrated flow value. Each of the 10 measurement periods shall be interspersed with an interval of 30 seconds in which the EFM is exposed to the maximum calibrated flow.
7.2.6. Zero response drift
The zero response drift is defined as the mean response to zero flow during a time interval of at least 30 seconds. The zero response drift can be verified based on the reported primary signals, e.g., pressure. The drift of the primary signals over a period of 4 hours shall be less than ±2 per cent of the maximum value of the primary signal recorded at the flow at which the EFM was calibrated.
7.2.7. Span response drift
The span response drift is defined as the mean response to a span flow during a time interval of at least 30 seconds. The span response drift can be verified based on the reported primary signals, e.g., pressure. The drift of the primary signals over a period of 4 hours shall be less than ± 2 per cent of the maximum value of the primary signal recorded at the flow at which the EFM was calibrated.
7.2.8. Rise time
The rise time of the exhaust flow instruments and methods should match as far as possible the rise time of the gas analysers as specified in paragraph 4.2.7. but shall not exceed 1 second.
7.2.9. Response time check
The response time of exhaust mass flow meters shall be determined by applying similar parameters as those applied for the emissions test (i.e., pressure, flow rates, filter settings and all other response time influences). The response time determination shall be done with gas switching directly at the inlet of the exhaust mass flow meter. The gas flow switching shall be done as fast as possible, but in less than 0.1 second is highly recommended. The gas flow rate used for the test shall cause a flow rate change of at least 60 per cent full scale of the exhaust mass flow meter. The gas flow shall be recorded. The delay time is defined as the time from the gas flow switching (t0) until the response is 10 per cent (t10) of the final reading. The rise time is defined as the time between 10 per cent and 90 per cent response (t10 to t90) of the final reading. The response time (t90) is defined as the sum of the delay time and the rise time. The exhaust mass flow meter response time (t90) shall be ≤ 3 seconds with a rise time (t10 to t90) of ≤ 1 second in accordance with paragraph 7.2.8.
8. Sensors and auxiliary equipment
Any sensor or auxiliary equipment used to determine temperature, atmospheric pressure, ambient humidity, vehicle speed, fuel flow or intake air flow, for example, shall not alter or unduly affect the performance of the vehicle’s engine and exhaust after-treatment system. The accuracy of sensors and auxiliary equipment shall fulfil the requirements of Table A5/4. Compliance with the requirements of Table A5/4 shall be demonstrated at intervals specified by the instrument manufacturer, as required by internal audit procedures or in accordance with ISO 9000.
± 10 % of reading or, 1 gH2O/kg dry air, whichever is larger
Annex 6
Validation of PEMS and non-traceable exhaust mass flow rate
1. Introduction
This annex describes the requirements to validate under transient conditions the functionality of the installed PEMS as well as the correctness of the exhaust mass flow rate obtained from non-traceable exhaust mass flow meters or calculated from ECU signals.
2. Symbols, Parameters and Units
a0
—
y intercept of the regression line
a1
—
slope of the regression line
r2
—
coefficient of determination
x
—
actual value of the reference signal
y
—
actual value of the signal under validation
3. Validation procedure for PEMS
3.1. Frequency of PEMS validation
It is recommended to validate the correct installation of a PEMS on a vehicle via comparison with laboratory installed equipment on a test performed on a chassis dynamometer either before the RDE test or, alternatively, after the completion of the test. For tests performed during type approval, the validation test is required.
3.2. PEMS validation procedure
3.2.1. PEMS installation
The PEMS shall be installed and prepared according to the requirements of Annex 4. The PEMS installation shall be kept unchanged in the time period between the validation and the RDE test.
3.2.2. Test conditions
The validation test shall be conducted on a chassis dynamometer, as far as possible, under type approval conditions by following the requirements of UN Regulation No. 154 on WLTP for a 4-phase cycle. It is recommended to feed the exhaust flow extracted by the PEMS during the validation test back to the CVS. If this is not feasible, the CVS results shall be corrected for the extracted exhaust mass. If the exhaust mass flow rate is validated with an exhaust mass flow meter, it is recommended to cross-check the mass flow rate measurements with data obtained from a sensor or the ECU.
3.2.3. Data analysis
The total distance-specific emissions [g/km] measured with laboratory equipment shall be calculated in accordance with UN Regulation No. 154 on WLTP. The emissions as measured with the PEMS shall be calculated according to Annex 7, summed to give the total mass of pollutants [g] and then divided by the test distance [km] as obtained from the chassis dynamometer. The total distance-specific mass of pollutants [g/km], as determined by the PEMS and the reference laboratory system, shall be evaluated against the requirements specified in paragraph 3.3. For the validation of NOX emission measurements, humidity correction shall be applied in accordance with UN Regulation No. 154 on WLTP.
3.3. Permissible tolerances for PEMS validation
The PEMS validation results shall fulfil the requirements given in Table A6/1. If any permissible tolerance is not met, corrective action shall be taken and the PEMS validation shall be repeated.
15 mg/km or 15 % of the laboratory reference, whichever is larger
CH42 [mg/km]
15 mg/km or 15 % of the laboratory reference, whichever is larger
NMHC2 [mg/km]
20 mg/km or 20 % of the laboratory reference, whichever is larger
PN2 [#/km]
8•1010 p/km or 42 % of the laboratory reference[25] whichever is larger
CO2 [mg/km]
100 mg/km or 15 % of the laboratory reference, whichever is larger
CO2 [g/km]
10 g/km or 7.5 % of the laboratory reference, whichever is larger
NOX2 [mg/km]
10 mg/km or 12.5 % of the laboratory reference, whichever is larger
4. Validation procedure for the exhaust mass flow rate determined by non-traceable instruments and sensors
4.1. Frequency of validation
In addition to fulfilling the linearity requirements of paragraph 3. of Annex 5 under steady-state conditions, the linearity of non-traceable exhaust mass flow meters or the exhaust mass flow rate calculated from non-traceable sensors or ECU signals shall be validated under transient conditions for each test vehicle against a calibrated exhaust mass flow meter or the CVS.
4.2. Validation procedure
The validation shall be conducted on a chassis dynamometer under type approval conditions, as far as applicable on the same vehicle used for the RDE test. As reference, a flow meter with traceable calibration shall be used. The ambient temperature can be any within the range specified in paragraph 8.1. of this Regulation. The installation of the exhaust mass flow meter and the execution of the test shall fulfil the requirement of paragraph 3.4.3. of Annex 4.
The following calculation steps shall be taken to validate the linearity:
(a) The signal under validation and the reference signal shall be time corrected by following, as far as applicable, the requirements of paragraph 3. of Annex 7.
(b) Points below 10 per cent of the maximum flow value shall be excluded from the further analysis.
(c) At a constant frequency of at least 1.0 Hz, the signal under validation and the reference signal shall be correlated using the best-fit equation having the form:
is the actual value of the signal under validation
a1
is the slope of the regression line
x
is the actual value of the reference signal
a0
is the y intercept of the regression line
The standard error of estimate (SEE) of y on x and the coefficient of determination (r2) shall be calculated for each measurement parameter and system.
(d) The linear regression parameters shall meet the requirements specified in Table A6/2.
4.3. Requirements
The linearity requirements given in Table A6/2 shall be fulfilled. If any permissible tolerance is not met, corrective action shall be taken and the validation shall be repeated.
Table A6/2
Linearity requirements of calculated and measured exhaust mass flow
Measurement parameter/system
a0
Slope a1
Standard error of the estimate SEE
Coefficient of determination<br>r2
Exhaust mass flow
0.0 ± 3.0 kg/h
1.00 ± 0.075
≤10 % max
≥ 0.90
Annex 7
Determination of instantaneous emissions
1. Introduction
This annex describes the procedure to determine the instantaneous mass and particle number emissions [g/s; #/s], following application of the data consistency rules of Annex 4. The instantaneous mass and particle number emissions shall then be used for the subsequent evaluation of a RDE trip and the calculation of the intermediate and final emission result as described in Annex 11.
2. Symbols, Parameters and Units
α
—
molar hydrogen ratio (H/C)
β
—
molar carbon ratio (C/C)
γ
—
molar sulphur ratio (S/C)
δ
—
molar nitrogen ratio (N/C)
Δtt,i
—
transformation time t of the analyser [s]
Δtt,m
—
transformation time t of the exhaust mass flow meter [s]
ε
—
molar oxygen ratio (O/C)
ρe
—
density of the exhaust
ρgas
—
density of the exhaust component ‘gas’
λ
—
excess air ratio
λi
—
instantaneous excess air ratio
A/Fst
—
stoichiometric air-to-fuel ratio [kg/kg]
cCH4
—
concentration of methane
cCO
—
dry CO concentration [%]
cCO2
—
dry CO2 concentration [%]
cdry
—
dry concentration of a pollutant in ppm or per cent volume
cgas,i
—
instantaneous concentration of the exhaust component ‘gas’ [ppm]
cHCw
—
wet HC concentration [ppm]
cHC(w/NMC)
—
HC concentration with CH4 or C2H6 flowing through the NMC [ppmC1]
cHC(w/oNMC)
—
HC concentration with CH4 or C2H6 bypassing the NMC [ppmC1]
ci,c
—
time-corrected concentration of component i [ppm]
ci,r
—
concentration of component i [ppm] in the exhaust
cNMHC
—
concentration of non-methane hydrocarbons
cwet
—
wet concentration of a pollutant in ppm or per cent volume
EE
—
ethane efficiency
EM
—
methane efficiency
Ha
—
intake air humidity [g water per kg dry air]
i
—
number of the measurement
mgas,i
—
mass of the exhaust component ‘gas’ [g/s]
qmaw,i
—
instantaneous intake air mass flow rate [kg/s]
qm,c
—
time-corrected exhaust mass flow rate [kg/s]
qmew,i
—
instantaneous exhaust mass flow rate [kg/s]
qmf,i
—
instantaneous fuel mass flow rate [kg/s]
qm,r
—
raw exhaust mass flow rate [kg/s]
r
—
cross-correlation coefficient
r2
—
coefficient of determination
rh
—
hydrocarbon response factor
ugas
—
u value of the exhaust component ‘gas’
3. Time correction of parameters
For the correct calculation of distance-specific emissions, the recorded traces of component concentrations, exhaust mass flow rate, vehicle speed, and other vehicle data shall be time corrected. To facilitate the time correction, data which are subject to time alignment shall be recorded either in a single data recording device or with a synchronised timestamp following paragraph 5.1. of Annex 4. The time correction and alignment of parameters shall be carried out by following the sequence described in paragraphs 3.1. to 3.3.
3.1. Time correction of component concentrations
The recorded traces of all component concentrations shall be time corrected by reverse shifting according to the transformation times of the respective analysers. The transformation time of analysers shall be determined according to paragraph 4.4. of Annex 5:
is the time-corrected concentration of component i as function of time t
ci,r
is the raw concentration of component i as function of time t
Δtt,i
is the transformation time t of the analyser measuring component i
3.2. Time correction of exhaust mass flow rate
The exhaust mass flow rate measured with an exhaust flow meter shall be time corrected by reverse shifting according to the transformation time of the exhaust mass flow meter. The transformation time of the mass flow meter shall be determined according to paragraph 4.4. of Annex 5:
is the time-corrected exhaust mass flow rate as function of time t
qm,r
is the raw exhaust mass flow rate as function of time t
Δtt,m
is the transformation time t of the exhaust mass flow meter
In case the exhaust mass flow rate is determined by ECU data or a sensor, an additional transformation time shall be considered and obtained by cross-correlation between the calculated exhaust mass flow rate and the exhaust mass flow rate measured following paragraph 4. of Annex 6.
3.3. Time alignment of vehicle data
Other data obtained from a sensor or the ECU shall be time-aligned by cross-correlation with suitable emission data (e.g., component concentrations).
3.3.1. Vehicle speed from different sources
To time align vehicle speed with the exhaust mass flow rate, it is first necessary to establish one valid speed trace. In case vehicle speed is obtained from multiple sources (e.g., the GNSS, a sensor or the ECU), the speed values shall be time aligned by cross-correlation.
3.3.2. Vehicle speed with exhaust mass flow rate
Vehicle speed shall be time aligned with the exhaust mass flow rate by cross-correlation between the exhaust mass flow rate and the product of vehicle speed and positive acceleration.
3.3.3. Further signals
The time alignment of signals whose values change slowly and within a small value range, e.g. ambient temperature, can be omitted.
4. Emission measurements during stop of the combustion engine
Any instantaneous emissions or exhaust flow measurements obtained while the combustion engine is deactivated shall be recorded in the data exchange file.
is the intake air humidity [g water per kg dry air]
cCO2
is the dry CO2 concentration [%]
cCO
is the dry CO concentration [%]
α
is the molar hydrogen ratio of the fuel (H/C)
5.2. Correction of NOX for ambient humidity and temperature
NOX emissions shall not be corrected for ambient temperature and humidity.
5.3. Correction of negative emission results
Negative instantaneous results shall not be corrected.
6. Determination of the instantaneous gaseous exhaust components
6.1. Introduction
The components in the raw exhaust shall be measured with the measurement and sampling analysers described in Annex 5. The raw concentrations of relevant components shall be measured in accordance with Annex 4. The data shall be time corrected and aligned in accordance with paragraph 3 of this annex.
6.2. Calculating NMHC and CH4 concentrations
For methane measurement using a NMC-FID, the calculation of NMHC depends on the calibration gas/method used for the zero/span calibration adjustment. When a FID is used for THC measurement without a NMC, it shall be calibrated with propane/air or propane/N2 in the normal manner. For the calibration of the FID in series with a NMC, the following methods are permitted:
(a) the calibration gas consisting of propane/air bypasses the NMC;
(b) the calibration gas consisting of methane/air passes through the NMC.
It is strongly recommended to calibrate the methane FID with methane/air through the NMC.
In method (a), the concentrations of CH4 and NMHC shall be calculated as follows:
is the HC concentration with CH4 or C2H6 bypassing the NMC [ppmC1]
cHC(w/NMC)
is the HC concentration with CH4 or C2H6 flowing through the NMC [ppmC1]
rh
is the hydrocarbon response factor as determined in paragraph 4.3.3.(b) of Annex 5
EM
is the methane efficiency as determined in paragraph 4.3.4.(a) of Annex 5
EE
is the ethane efficiency as determined in paragraph 4.3.4.(b) of Annex 5
If the methane FID is calibrated through the cutter (method b), then the methane conversion efficiency as determined in paragraph 4.3.4.(a) of Annex 5 is zero. The density used for calculating the NMHC mass shall be equal to that of total hydrocarbons at 273.15 K and 101.325 kPa and is fuel-dependent.
7. Determination of exhaust mass flow rate
7.1. Introduction
The calculation of instantaneous mass emissions according to paragraphs 8. and 9. requires determining the exhaust mass flow rate. The exhaust mass flow rate shall be determined by one of the direct measurement methods specified in paragraph 7.2. of Annex 5. Alternatively, it is permissible to calculate the exhaust mass flow rate as described in paragraphs 7.2. to 7.4. of this annex.
7.2. Calculation method using air mass flow rate and fuel mass flow rate
The instantaneous exhaust mass flow rate can be calculated from the air mass flow rate and the fuel mass flow rate as follows:
where:
qmew,i
is the instantaneous exhaust mass flow rate [kg/s]
qmaw,i
is the instantaneous intake air mass flow rate [kg/s]
qmf,i
is the instantaneous fuel mass flow rate [kg/s]
If the air mass flow rate and the fuel mass flow rate or the exhaust mass flow rate are determined from ECU recording, the calculated instantaneous exhaust mass flow rate shall meet the linearity requirements specified for the exhaust mass flow rate in paragraph 3. of Annex 5 and the validation requirements specified in paragraph 4.3. of Annex 6.
7.3. Calculation method using air mass flow and air-to-fuel ratio
The instantaneous exhaust mass flow rate can be calculated from the air mass flow rate and the air-to-fuel ratio as follows:
is the instantaneous intake air mass flow rate [kg/s]
A/Fst
is the stoichiometric air-to-fuel ratio [kg/kg]
λi
is the instantaneous excess air ratio
cCO2
is the dry CO2 concentration [%]
cCO
is the dry CO concentration [ppm]
cHCw
is the wet HC concentration [ppm]
α
is the molar hydrogen ratio (H/C)
β
is the molar carbon ratio (C/C)
γ
is the molar sulphur ratio (S/C)
δ
is the molar nitrogen ratio (N/C)
ε
is the molar oxygen ratio (O/C)
Coefficients refer to a fuel Cβ Hα Oε Nδ Sγ with β = 1 for carbon based fuels. The concentration of HC emissions is typically low and may be omitted when calculating λi.
If the air mass flow rate and air-to-fuel ratio are determined from ECU recording, the calculated instantaneous exhaust mass flow rate shall meet the linearity requirements specified for the exhaust mass flow rate in paragraph 3. of Annex 5 and the validation requirements specified in paragraph 4.3. of Annex 6.
7.4. Calculation method using fuel mass flow and air-to-fuel ratio
The instantaneous exhaust mass flow rate can be calculated from the fuel flow and the air-to-fuel ratio (calculated with A/Fst and λi according to paragraph 7.3.) as follows:
The calculated instantaneous exhaust mass flow rate shall meet the linearity requirements specified for the exhaust gas mass flow rate in paragraph 3. of Annex 5 and the validation requirements specified in paragraph 4.3. of Annex 6.
8. Calculating the instantaneous mass emissions of gaseous components
The instantaneous mass emissions [g/s] shall be determined by multiplying the instantaneous concentration of the pollutant under consideration [ppm] with the instantaneous exhaust mass flow rate [kg/s], both corrected and aligned for the transformation time, and the respective u value in Table A7/1. If measured on a dry basis, the dry-wet correction according to paragraph 5.1. shall be applied to the instantaneous component concentrations before executing any further calculations. If occurring, negative instantaneous emission values shall enter all subsequent data evaluations. Parameter values shall enter the calculation of instantaneous emissions [g/s] as reported by the analyser, flow-measuring instrument, sensor or the ECU. The following equation shall be applied:
is the ratio of the density of the exhaust component ‘gas’ and the overall density of the exhaust as listed in Table A7/1
cgas,i
is the measured concentration of the exhaust component ‘gas’ in the exhaust [ppm]
qmew,i
is the measured exhaust mass flow rate [kg/s]
gas
is the respective component
i
number of the measurement
Table A7/1
Raw exhaust gas u values depicting the ratio between the densities of exhaust component or pollutant i [kg/m3] and the density of the exhaust gas [kg/m3]
c u values accurate within 0.2% for mass composition of: C=66-76%; H=22-25%; N=0-12%
d NMHC on the basis of CH2.93 (for THC the ugas coefficient of CH4 shall be used)
e u accurate within 0.2% for mass composition of: C3=70-90%; C4=10-30%
f ugas is a unitless parameter; the ugas values include unit conversions to ensure that the instantaneous emissions are obtained in the specified physical unit, i.e., g/s
As an alternative to the above method, emission rates might also be calculated with the method described in Annex A.7 of GTR 11.
9. Calculating the instantaneous particle number emissions
The instantaneous particle number emissions [particles/s] shall be determined by multiplying the instantaneous concentration of the pollutant under consideration [particles/cm3] with the instantaneous exhaust mass flow rate [kg/s], both corrected and aligned for the transformation time and by dividing with the density [kg/m³] according to Table A7/1. If applicable, negative instantaneous emission values shall enter all subsequent data evaluations. All significant digits of preceding results shall enter the calculation of the instantaneous emissions. The following equation shall apply:
is the measured particle number concentration [#/m3] normalized at 0 °C
qmew,i
is the measured exhaust mass flow rate [kg/s]
ρe
is the density of the exhaust gas [kg/m3] at 0 °C (Table A7/1)
10. Data exchange
Data Exchange: The data shall be exchanged between the measurement systems and the data evaluation software by a standardised data exchange file found at the same weblink[26] as the UN Regulation.
Any pre-processing of data (e.g. time correction according to paragraph 3 of this annex, vehicle speed correction according to paragraph 4.7. of Annex 4 or the correction of the GNSS vehicle speed signal according to paragraph 6.5. of Annex 4) shall be done with the control software of the measurement systems and shall be completed before the data exchange file is generated.
Annex 8
Assessment of overall trip validity using the moving averaging window method
1. Introduction
The Moving Averaging Window method shall be used to assess the overall trip dynamics. The test is divided in sub-sections (windows) and the subsequent analysis aims at determining whether the trip is valid for RDE purposes. The ‘normality’ of the windows shall be assessed by comparing their CO2 distance-specific emissions with a reference curve obtained from the vehicle CO2 emissions measured in accordance with the WLTP test.
For compliance with this Regulation, the method shall be applied using the 4-phase and the 3-phase WLTC requirements.
2. Symbols, Parameters and Units
Index (i) refers to the time step
Index (j) refers to the window
Index (k) refers to the category (t=total, ls=low speed, ms=medium speed, hs=high speed) or to the CO2 characteristic curve (cc)
lower tolerance for the vehicle CO2 characteristic curve, [%]
3. Moving averaging windows
3.1. Definition of averaging windows
The instantaneous CO2 emissions calculated according to Annex 7 shall be integrated using a moving averaging window method, based on a reference CO2 mass.
The usage of the reference CO2 mass is illustrated in Figure A8/2. The principle of the calculation is as follows: The RDE distance-specific CO2 mass emissions are not calculated for the complete data set, but for sub-sets of the complete data set, the length of these sub-sets being determined so as to always match the same fraction of the CO2 mass emitted by the vehicle over the applicable WLTP test (after all appropriate corrections e.g. ATCT are applied, where relevant). The moving window calculations are conducted with a time increment Δt corresponding to the data sampling frequency. These sub-sets used to calculate the vehicle on-road CO2 emissions and its average speed are referred to as ‘averaging windows’ in the following sections. The calculation described in this point shall be run from the first data point (forward), as shown in Figure A8/1.
The following data shall not be considered for the calculation of the CO2 mass, the distance and the vehicle average speed in each averaging window:
The periodic verification of the instruments and/or after the zero drift verifications;
Vehicle ground speed < 1 km/h;
The calculation shall start from when vehicle ground speed is higher than or equal to 1 km/h and include driving events during which no CO2 is emitted and where the vehicle ground speed is higher than or equal to 1 km/h.
The mass emissions View image in the official source shall be determined by integrating the instantaneous emissions in g/s as specified in Annex 7.
Figure A8/1
Vehicle speed versus time - Vehicle averaged emissions versus time, starting from the first averaging window
M subscript CO2, ref is the reference CO2 mass (half of the CO2 mass emitted by the vehicle over the applicable WLTP test).
During type approval, the CO2 mass reference value shall be taken from the WLTP test of the individual vehicle, obtained in accordance with UN Regulation No. 154, including all appropriate corrections.
The reference dynamic conditions of the test vehicle are defined from the vehicle CO2 emissions versus average speed measured at type approval on the WLTP test and referred to as ‘vehicle CO2 characteristic curve’.
4.2. CO2 characteristic curve reference points
The distance specific CO2 emissions of the tested vehicle shall be taken from the applicable phases of the validation WLTP 4-phase test run in accordance with UN Regulation No. 154 on WLTP on that particular vehicle. The value for OVC-HEV vehicles is to be that obtained from the applicable WLTP test conducted using Charge Sustaining vehicle operation.
During type approval, the CO2 reference values shall be taken from the WLTP test of the individual vehicle, obtained in accordance with UN Regulation No 154, including all appropriate corrections.
The reference points P1, P2 and P3 required to define the vehicle CO2 characteristic curve shall be established as follows:
Using the reference points defined in paragraph 4.2., the characteristic curve CO2 emissions are calculated as a function of the average speed using two linear sections (P1, P2) and (P2, P3). The section (P2, P3) is limited to 145 km/h on the vehicle speed axis. The characteristic curve is defined by equations as follows:
Medium speed windows are characterized by average vehicle ground speeds View image in the official source greater than or equal to 45 km/h and lower than 80 km/h.
4.4.1.3. High speed windows
High speed windows are characterized by average vehicle ground speeds View image in the official source greater than or equal to 80 km/h and lower than 145 km/h
Figure A8/5
Vehicle CO2 characteristic curve: low, medium and high speed definitions (Illustrated for ICE and NOVC-HEV vehicles)
The test is valid when it comprises at least 50 per cent of the low, medium and high speed windows that are within the tolerances defined for the CO2 characteristic curve.
The test is valid when it comprises at least 50 per cent of the low, and high speed windows that are within the tolerances defined for the CO2 characteristic curve.
actual vehicle speed per positive acceleration greater than 0.1 m/s2 in time step j considering the urban, rural and motorway/expressway shares [m2/s3 or W/kg].
95th percentile of the product of vehicle speed per positive acceleration greater than 0.1 m/s2 for urban, rural and motorway/expressway shares [m2/s3 or W/kg]
average vehicle speed for urban, rural and motorway/expressway shares [km/h]
3. Trip indicators
3.1. Calculations
3.1.1. Data pre-processing
Dynamic parameters, such as acceleration, (v × apos) or RPA, shall be determined with a speed signal of an accuracy of 0.1 per cent for all speed values above 3 km/h and a sampling frequency of 1 Hz. Otherwise, acceleration shall be determined with an accuracy of 0.01 m/s2 and a sampling frequency of 1 Hz. In this case, a separate speed signal is required for View image in the official source and shall have an accuracy of at least 0.1 km/h. The speed trace shall form the basis for further calculations and binning as described in paragraphs 3.1.2. and 3.1.3.
3.1.2. Calculation of distance, acceleration and (v × a)
The following calculations shall be performed over the whole time based speed trace from the beginning to the end of the test data.
The distance increment per data sample shall be calculated as follows:
(v × a)i is the product of the actual vehicle speed per acceleration in time step i [m2/s3 or W/kg].
3.1.3. Binning of the results
3.1.3.1. Binning of the results (for analysis with 4-phase WLTP)
After the calculation of ai and (v × a)i the values vi, di, ai and (v × a)i shall be ranked in ascending order of the vehicle speed.
All datasets with (vi ≤ 60 km/h) belong to the ‘urban’ speed bin, all datasets with (60 km/h < vi ≤ 90 km/h) belong to the ‘rural’ speed bin and all datasets with (vi > 90 km/h) belong to the ‘motorway’ speed bin.
The number of datasets with acceleration values ai > 0.1 m/s2 shall be greater than or equal to 100 in each speed bin.
The 95th percentile of the (v ×apos) values shall be calculated as follows:
The (v ×apos)i,k, values in each speed bin shall be ranked in ascending order for all datasets with ai,k > 0.1m/s2 and the total number of these samples Mk shall be determined.
Percentile values are then assigned to the (v ×apos)i,k values with ai,k > 0.1 m/s2 as follows:
The lowest (v ×apos) value gets the percentile 1/Mk, the second lowest 2/Mk, the third lowest 3/Mk and the highest value (Mk/Mk = 100 %.)
The 95th percentile of the (v ×apos) values shall be calculated as follows:
The (v ×apos)i,k values in each speed bin shall be ranked in ascending order for all datasets with ai,k > 0.1m/s2 and the total number of these samples Mk shall be determined.
Percentile values are then assigned to (v ×apos)i,k values with ai,k > 0.1 m/s2 as follows:
The lowest (v ×apos) value gets the percentile 1/Mk, the second lowest 2/Mk, the third lowest 3/Mk and the highest value (Mk/Mk = 100 %.)
Procedure to determine the cumulative positive elevation gain of a PEMS trip
1. Introduction
This annex describes the procedure to determine the cumulative elevation gain of a PEMS trip.
2. Symbols, Parameters and Units
d(0)
—
distance at the start of a trip [m]
d
—
cumulative distance travelled at the discrete way point under consideration [m]
d0
—
cumulative distance travelled until the measurement directly before the respective way point d [m]
d1
—
cumulative distance travelled until the measurement directly after the respective way point d [m]
da
—
reference way point at d(0) [m]
de
—
cumulative distance travelled until the last discrete way point [m]
di
—
instantaneous distance [m]
dtot
—
total test distance [m]
h(0)
—
vehicle altitude after the screening and principle verification of data quality at the start of a trip [m above sea level]
h(t)
—
vehicle altitude after the screening and principle verification of data quality at point t [m above sea level]
h(d)
—
vehicle altitude at the way point d [m above sea level]
h(t-1)
—
vehicle altitude after the screening and principle verification of data quality at point t-1 [m above sea level]
hcorr(0)
—
corrected altitude directly before the respective way point d [m above sea level]
hcorr(1)
—
corrected altitude directly after the respective way point d [m above sea level]
hcorr(t)
—
corrected instantaneous vehicle altitude at data point t [m above sea level]
hcorr(t-1)
—
corrected instantaneous vehicle altitude at data point t-1 [m above sea level]
hGNSS,i
—
instantaneous vehicle altitude measured with GNSS [m above sea level]
hGNSS(t)
—
vehicle altitude measured with GNSS at data point t [m above sea level]
hint(d)
—
interpolated altitude at the discrete way point under consideration d [m above sea level]
hint,sm,1(d)
—
smoothed and interpolated altitude, after the first smoothing run at the discrete way point under consideration d [m above sea level]
hmap(t)
—
vehicle altitude based on topographic map at data point t [m above sea level]
roadgrade,1(d)
—
smoothed road grade at the discrete way point under consideration d after the first smoothing run [m/m]
roadgrade,2(d)
—
smoothed road grade at the discrete way point under consideration d after the second smoothing run [m/m]
sin
—
trigonometric sine function
t
—
time passed since test start [s]
t0
—
time passed at the measurement directly located before the respective way point d [s]
vi
—
instantaneous vehicle speed [km/h]
v(t)
—
vehicle speed at a data point t [km/h]
3. General requirements
The cumulative positive elevation gain of a RDE trip shall be determined based on three parameters: the instantaneous vehicle altitude hGNSS,i [m above sea level] as measured with the GNSS, the instantaneous vehicle speed vi [km/h] recorded at a frequency of 1 Hz and the corresponding time t [s] that has passed since test start.
4. Calculation of cumulative positive elevation gain
4.1. General
The cumulative positive elevation gain of a RDE trip shall be calculated as a two-step procedure, consisting of (i) the correction of instantaneous vehicle altitude data, and (ii) the calculation of the cumulative positive elevation gain.
4.2. Correction of instantaneous vehicle altitude data
The altitude h(0) at the start of a trip at d(0) shall be obtained by GNSS and verified for correctness with information from a topographic map. The deviation shall not be larger than 40 m. Any instantaneous altitude data h(t) shall be corrected if the following condition applies:
vehicle altitude after the screening and principle check of data quality at data point t [m above sea level]
h(t-1)
—
vehicle altitude after the screening and principle check of data quality at data point t-1 [m above sea level]
v(t)
—
vehicle speed of data point t [km/h]
hcorr(t)
—
corrected instantaneous vehicle altitude at data point t [m above sea level]
hcorr(t-1)
—
corrected instantaneous vehicle altitude at data point t-1 [m above sea level]
Upon the completion of the correction procedure, a valid set of altitude data is established. This data set shall be used for the calculation of the cumulative positive elevation gain as described in the following.
4.3. Final calculation of the cumulative positive elevation gain
4.3.1. Establishment of a uniform spatial resolution
The cumulative elevation gain shall be calculated from data of a constant spatial resolution of 1 m starting with the first measurement at the start of a trip d(0). The discrete data points at a resolution of 1 m are referred to as way points, characterized by a specific distance value d (e.g., 0, 1, 2, 3 m…) and their corresponding altitude h(d) [m above sea level].
The altitude of each discrete way point d shall be calculated through interpolation of the instantaneous altitude hcorr(t) as:
interpolated altitude at the discrete way point under consideration d [m above sea level]
hcorr(0)
—
corrected altitude directly before the respective way point d [m above sea level]
hcorr(1)
—
corrected altitude directly after the respective way point d [m above sea level]
d
—
cumulative distance travelled at the discrete way point under consideration d [m]
d0
—
cumulative distance travelled until the measurement located directly before the respective way point d [m]
d1
—
cumulative distance travelled until the measurement located directly after the respective way point d [m]
4.3.2. Additional data smoothing
The altitude data obtained for each discrete way point shall be smoothed by applying a two-step procedure; da and de denote the first and last data point respectively (see Figure A10/1). The first smoothing run shall be applied as follows:
The positive cumulative elevation gain of a total trip shall be calculated by integrating all positive interpolated and smoothed road grades, i.e., roadgrade,2(d). The result should be normalized by the total test distance dtot and expressed in meters of cumulative elevation gain per one hundred kilometres of distance.
The waypoint vehicle speed vw shall then be calculated over each discrete way point of 1m:
For 3-phase WLTP evaluation all datasets with vw ≤ 100 km/h are used for the calculation of the cumulative positive altitude gain of the complete trip.
All of the positive interpolated and smoothed road gradients that correspond to ≤ 100 km/h datasets shall be integrated.
The number of 1m waypoints which correspond to ≤ 100 km/h datasets shall be integrated and converted to km to define the ≤ 100 km/h test distance d100 [km].
The positive cumulative elevation gain of the urban part of the trip shall then be calculated based on the vehicle speed over each discrete way point. All datasets with vw ≤ 60 km/h belong to the urban part of the trip. All of the positive interpolated and smoothed road grades that correspond to urban datasets shall be integrated.
The number of 1m waypoints which correspond to urban datasets shall be integrated and converted to km to define the urban test distance d urban [km].
The positive cumulative elevation gain of the urban part of a trip shall then be calculated by dividing the urban elevation gain by the urban test distance, and expressed in metres of cumulative elevation gain per one hundred kilometres of distance.
Annex 11
Calculation of the final RDE emissions results
1. Introduction
This annex describes the procedure to calculate the final criteria emissions for the complete and urban part of an RDE trip for the 3-phase and 4-phase WLTP.
2. Symbols, Parameters and Units
Index (k) refers to the category (t=total, u=urban, 1-2=first two phases of the WLTP test)
ICk is the distance share of usage of the internal combustion engine for an OVC-HEV over the RDE trip
dICE,k is the distance driven [km], with the internal combustion engine on for an OVC-HEV over the RDE trip
dEV,k is the distance driven [km], with the internal combustion engine off for an OVC-HEV over the RDE trip
MRDE,k is the final RDE distance-specific mass of gaseous pollutants [mg/km] or particle number [#/km]
mRDE,k is the distance-specific mass of gaseous pollutant [mg/km] or particle number [#/km] emissions, emitted over the complete RDE trip and prior to any correction in accordance with this annex
M subscript CO2, RDE, k is the distance-specific mass of CO2 [g/km], emitted over the RDE trip
M subscript CO2,WLTC,k is the distance-specific mass of CO2 [g/km], emitted over the WLTC cycle
M subscript CO2, WLTC underscore CS, k is the distance-specific mass of CO2 [g/km], emitted over the WLTC cycle for an OVC-HEV vehicle tested in charge sustaining vehicle operation
rk is the ratio between the CO2 emissions measured during the RDE test and the WLTP test
RFk is the result evaluation factor calculated for the RDE trip
RFL1 is the first parameter of the function used to calculate the result evaluation factor
RFL2 is the second parameter of the function used to calculate the result evaluation factor
3. Calculation of the Intermediate RDE emissions results
For the valid trips, the intermediate RDE results are calculated as follows for vehicles with ICE, NOVC-HEV and OVC-HEV.
Any instantaneous emissions or exhaust flow measurements obtained while the combustion engine is deactivated, as defined in paragraph 3.6.3. of this Regulation, shall be set to zero.
Any correction of the instantaneous criteria emissions for Extended conditions according to paragraphs 8.1., 10.5. and 10.6. of this Regulation shall be applied.
For the complete RDE trip and for the urban part of the RDE trip (k=t=total, k=u=urban):
The values of the parameter RFL1 and RFL2 of the function used to calculate the result evaluation factor are as follows:
RFL1 = 1.30 and RFL2 = 1.50;
The RDE result evaluation factors RFk (k=t=total, k=u=urban) shall be obtained using the functions laid down in paragraph 2.2. for vehicles with ICE and NOVC-HEV, and in paragraph 2.3. for OVC-HEV. A graphical illustration of the method is provided in Figure A11/1 below, while the mathematical formulas are found in Table A11/1:
Figure A11/1
Function to calculate the result evaluation factor
3.1. RDE result evaluation factor for vehicles with ICE and NOVC-HEV
The value of the RDE result evaluation factor depends on the ratio rk between the distance specific CO2 emissions measured during the RDE test and the distance-specific CO2 emitted by the vehicle over the validation WLTP test conducted on this vehicle including all appropriate corrections.
For the urban emissions, the relevant phases of the WLTP test shall be:
(a) For ICE vehicles, the first two WLTC phases, i.e. the Low and the Medium speed phases,
The value of the RDE result evaluation factor depends on the ratio View image in the official source between the distance-specific CO2 emissions measured during the RDE test and the distance-specific CO2 emitted by the vehicle over the applicable WLTP test conducted in Charge Sustaining vehicle operation including all appropriate corrections. The ratio View image in the official source is corrected by a ratio reflecting the respective usage of the internal combustion engine during the RDE trip and on the WLTP test, to be conducted in charge sustaining vehicle operation.
where ICk is the ratio of the distance driven either in urban or total trip with the combustion engine activated, divided by the total urban or total trip distance:
With determination of combustion engine operation in accordance with paragraph 3.6.3. of this Regulation.
4. Final RDE emission results taking into account the PEMS margin
In order to take into account the uncertainty of the PEMS measurements compared to the ones performed in the laboratory with the applicable WLTP test, the intermediate calculated emission values MRDE,k shall be divided by 1+marginpollutant., where marginpollutant defined in the Table A11/2.
The PEMS margin for each pollutant is specified as follows:
Table A11/2
Pollutant
Mass of oxides of nitrogen (NOX)
Number of particles (PN)
Mass of carbon monoxide (CO)
Mass of total hydrocarbons (THC)
Combined mass of total hydrocarbons and oxides of nitrogen (THC + NOX)
Marginpollutant
0.10
0.34
Not yet specified
Not yet specified
Not yet specified
Any negative final results shall be set to zero.
Any Ki factors which are applicable, according to paragraph 8.3.4. of this Regulation, shall be applied.
These values shall be considered the Final RDE emission results for NOX and PN
Annex 12
Manufacturer's RDE certificate of compliance
Manufacturer's certificate of compliance with the Real Driving Emissions requirements in UN Regulation No. [xxx]
(Manufacturer): …………………………………………………………………..
(Address of the Manufacturer): …………………………………………………………..
Certifies that:
The vehicle types listed in the annex to this Certificate comply with the requirements laid down in paragraph 6.1. of UN Regulation No. [xxx] for all valid RDE tests which are performed in accordance with the requirements of that Regulation.