Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p79
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 79/108)
Character Range: 1111171–1114261

same road load family. At the request of the manufacturer, and with approval of the approval authority, this demonstration of equivalency may be extended to other road load families upon evidence that a vehicle from the worst-case road load family was selected as the test vehicle.

              2.4.2.6. Information on whether the vehicle was tested on a 2WD dynamometer or a 4WD dynamometer and whether it was tested on a dynamometer in 2WD operation or 4WD operation shall be included in all relevant test reports. In the case that the vehicle was tested on a 4WD dynamometer, with that dynamometer in 2WD operation, this information shall also indicate whether or not the wheels on the non-powered wheels were rotating.
              2.4.3. The vehicle's exhaust system shall not exhibit any leak likely to reduce the quantity of gas collected.
              2.4.4. The settings of the powertrain and vehicle controls shall be those prescribed by the manufacturer for series production.
              2.4.5. Tyres shall be of a type specified as original equipment by the vehicle manufacturer. Tyre pressure may be increased by up to 50 per cent above the pressure specified in paragraph 4.2.2.3. of Annex B4. The same tyre pressure shall be used for the setting of the dynamometer and for all subsequent testing. The tyre pressure used shall be recorded.
              2.4.6. Reference fuel
              The appropriate reference fuel as specified in Annex B3 shall be used for testing.
              2.4.7. Test vehicle preparation
              2.4.7.1. The vehicle shall be approximately horizontal during the test so as to avoid any abnormal distribution of the fuel.
              2.4.7.2. If necessary, the manufacturer shall provide additional fittings and adapters, as required to accommodate a fuel drain at the lowest point possible in the tank(s) as installed on the vehicle, and to provide for exhaust sample collection.
              2.4.7.3. For PM sampling during a test when the regenerating device is in a stabilized loading condition (i.e. the vehicle is not undergoing a regeneration), it is recommended that the vehicle has completed more than 1/3 of the mileage between scheduled regenerations or that the periodically regenerating device has undergone equivalent loading off the vehicle.
              2.5. Preliminary testing cycles
              Preliminary testing cycles may be carried out if requested by the manufacturer to follow the speed trace within the prescribed limits.
              2.6. Test vehicle preconditioning
              2.6.1. Vehicle preparation
              2.6.1.1. Fuel tank filling
              The fuel tank(s) shall be filled with the specified test fuel. If the existing fuel in the fuel tank(s) does not meet the specifications contained in paragraph 2.4.6. of this annex, the existing fuel shall be drained prior to the fuel fill. The evaporative emission control system shall neither be abnormally purged nor abnormally loaded.
              2.6.1.2. REESSs charging
              Before the preconditioning test cycle, the