Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:23:p8
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 23 (pt 8/15)
Character Range: 1918988–1921957

find a commonly agreed solution.

              6. Vehicle operation on track, road or on chassis dynamometer

              6.1. Operating cycle

               During operation on track, road or on roller test bench, the distance shall be covered according to the driving schedule described in Appendix 3 or Appendix 3b (as applicable) to this annex.

              6.2. The durability test, or if the manufacturer has chosen, the modified durability test shall be conducted until the vehicle has covered its target useful life.

              6.3. Test equipment

              6.3.1. Chassis dynamometer

              6.3.1.1. When the durability test is performed on a chassis dynamometer, the dynamometer shall enable the cycle described in Appendix 3 or Appendix 3b (as applicable) to this annex to be carried out. In particular, it shall be equipped with systems simulating inertia and resistance to progress.

              6.3.1.2. The road load coefficients to be used shall be those for vehicle high (VH).

              6.3.1.3. The vehicle cooling system should enable the vehicle to operate at temperatures similar to those obtained on road (oil, water, exhaust system, etc.).

              6.3.1.4. Certain other test bench adjustments and features are deemed to be identical, where necessary, to those described in Annex B5 to this Regulation (inertia, for example, which may be mechanical or electronic).

              6.3.1.5. The vehicle may be moved, where necessary, to a different bench in order to conduct emission measurement tests.

              6.3.2. Operation on track or road

               When the durability test is completed on track or road, the test mass of the vehicle shall be the same as that retained for tests conducted on a chassis dynamometer.

              7. Measuring emissions of pollutants

               A first test is carried out when the vehicle has reached a mileage between 3,000 km and 5,000 km. Further tests are carried out at 20,000 km (±400 km) and then every 20,000 km (±400 km) or more frequently, at regular intervals until having covered the target useful life. Exhaust emissions are measured in accordance with the Type 1 Test as defined in paragraph 6.3. of this Regulation. At the choice of the manufacturer any of the above tests can be repeated. In such a case the average value of all the repeated tests shall be considered as a single value for the relevant mileage. After the target useful life required for Level 1B has been driven, it is no longer necessary to separately record the emissions results from the first 3 phases of WLTP.

              The limit values to be complied with are those laid down in paragraph 6.3.10. of this Regulation.

               In the case of vehicles equipped with periodically regenerating systems as defined in paragraph 3.8.1. of this Regulation, it shall be checked that the vehicle is not approaching a regeneration period. If this is the case, the