120Requirements of DT 80 test cycle

120 Requirements of DT 80 test cycle

(1)  The requirements stated in this regulation are the minimum standards for the dynamometer, emissions measure and data management systems necessary to enable the proper conduct of a test cycle (the DT 80 test cycle) of a vehicle.

(2)  The DT 80 test cycle must be conducted on a chassis dynamometer system that –

(a) can carry out a wide-open-throttle transient DT 80 test cycle, as described in regulation 121 , 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 2º-40ºC; and

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

(e) provides inertial loading as required by the DT 80 test cycle procedure at speeds of >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) keeps 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 the driver's seat, including controls for the 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 DT 80 test cycle 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 DT 80 test cycle must be conducted on an emissions measurement system that –