98Requirements of DT80 test cycle

98 Requirements of DT80 test cycle

98 Requirements of DT80 test cycle

(1) The requirements stated in the following subsections are the minimum standards for the dynamometer, emissions measurement and data management systems necessary to enable the proper conduct of the DT80 test cycle mentioned in section 96(3)(c).

(2) The DT80 test cycle must be conducted on a chassis dynamometer system that—

(a) can undertake a full throttle transient DT80 test cycle, as described in section 97, for the vehicle being tested; and

(b) provides for vehicle speed measurement and display, to an accuracy of ± 1% of actual speed; and

(c) provides internal steady state accuracy of ± 1% of calculated required tractive load over ambient temperatures of 2°–40° C: and

(d) provides a T95 response time of 3 seconds or less; and

(e) provides inertial loading as required by the DT80 protocol at speeds >15 km/h; and

(f) compensates for aerodynamic drag, rolling resistance and other parasitic losses; and

(g) corrects for ambient temperature, humidity and air density; and

(h) provides torque measurement accuracy of better than 1% full scale; and

(i) maintains roller speed within ± 10 km/h through gear changes; and

(j) restricts overshoot upon initial acceleration of rollers from rest; and

(k) incorporates a driver control panel for remote operation of critical functions from driver's seat, including controls for start test and stop test; and

(l) incorporates an emergency system override function; and

(m) is able to communicate speed, load and status signals to enable the driver to undertake the test in accordance with the DT80 procedure; and

(n) is integrated with the gas and particulate analysis system to initiate the start and finish of sampling and measurement, and generates emission results without the need for post-test processing.

(3) The emissions measurement system used for the DT80 test cycle must—