Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p26
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 26/28)
Character Range: 864623–867558

between test vehicle LR and HR. For other road load-relevant characteristic(s), the value of vehicle HR shall apply.
              H and L of the interpolation family may be derived from different road load families. If that difference between these road load families comes from applying the delta method, refer to paragraph 4.2.1.2.3.4. of this annex.
4.2.1.4. Application of the road load matrix family
              A vehicle that fulfils the criteria of paragraph 6.3.4. of this Regulation that is:
                  (a) Representative of the intended series of complete vehicles to be covered by the road load matrix family in terms of estimated worst CD value and body shape; and
                  (b) Representative of the intended series of vehicles to be covered by the road load matrix family in terms of estimated average of the mass of optional equipment
                  shall be used to determine the road load.
              In the case that no representative body shape for a complete vehicle can be determined, the test vehicle shall be equipped with a square box with rounded corners with radii of maximum of 25 mm and a width equal to the maximum width of the vehicles covered by the road load matrix family, and a total height of the test vehicle of 3.0 m ±0.1 m, including the box.
              The manufacturer and the responsible authority shall agree which vehicle test model is representative.
              The values of the vehicle parameters test mass, tyre rolling resistance and frontal area of both a vehicle HM and LM shall be determined in such a way that vehicle HM produces the highest cycle energy demand and vehicle LM the lowest cycle energy from the road load matrix family. The manufacturer and the responsible authority shall agree on the vehicle parameters for vehicles HM and LM.
              The road load of all individual vehicles of the road load matrix family, including HM and LM, shall be calculated according to paragraph 5.1. of this annex.
4.2.1.5. Movable aerodynamic body parts
              Movable aerodynamic body parts on the test vehicles shall operate during road load determination as intended under WLTP Type 1 test conditions (test temperature, vehicle speed and acceleration range, engine load, etc.).
              Every vehicle system that dynamically modifies the vehicle's aerodynamic drag (e.g. vehicle height control) shall be considered to be a movable aerodynamic body part. Appropriate requirements shall be added if future vehicles are equipped with movable aerodynamic items of optional equipment whose influence on aerodynamic drag justifies the need for further requirements.
4.2.1.6. Weighing
              Before and after the road load determination procedure, the selected vehicle shall be weighed, including the test driver and equipment, to determine the arithmetic average mass . The mass of the vehicle shall be greater than or equal to the test