Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p25
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 25/108)
Character Range: 954135–957362

dynamic radius on the chassis dynamometer shall be calculated according to the procedure described in paragraph 4.4.3.1. of this annex.

              If this adjustment is outside the range defined in paragraph 7.3.1. of this annex, the torque meter method shall not apply.

              7.3.4. Vehicle warm-up
              7.3.4.1. The vehicle shall be warmed up with the applicable WLTC. In the case that the vehicle was warmed up at 90 per cent of the maximum speed of the next higher phase during the procedure defined in paragraph 4.2.4.1.2. of this annex, this higher phase shall be added to the applicable WLTC.
Table A4/7
Vehicle warm-up
Vehicle class           Applicable WLTC                       Adopt next higher phase               Warm-up cycle
Class 1                 Low1+ Medium1                         NA                                    Low1+ Medium1
Class 2                 Low2 + Medium2 + High2 + Extra High2  NA                                    Low2 + Medium2 + High2 + Extra High2
Low2 + Medium2 + High2  Yes (Extra High2)
No                      Low2+ Medium2+ High2
Class 3                 Low3 + Medium3 + High3 + Extra High3  Low3 + Medium3 + High3 + Extra High3  Low3 + Medium3 + High3 + Extra High3
Low3 + Medium3 + High3  Yes (Extra High3)
No                      Low3 + Medium3 + High3

              7.3.4.2. If the vehicle is already warmed up, the WLTC phase applied in paragraph 7.3.4.1. of this annex, with the highest speed, shall be driven.

              7.3.4.3. Alternative warm-up procedure

              7.3.4.3.1. At the request of the vehicle manufacturer and with approval of the responsible authority, an alternative warm-up procedure may be used. The approved alternative warm-up procedure may be used for vehicles within the same road load family and shall satisfy the requirements outlined in paragraphs 7.3.4.3.2. to 7.3.4.3.5. inclusive of this annex.

              7.3.4.3.2. At least one vehicle representing the road load family shall be selected.

              7.3.4.3.3. The cycle energy demand calculated according to paragraph 5. of Annex B7 with corrected road load coefficients f0a, f1a and f2a, for the alternative warm-up procedure shall be equal to or higher than the cycle energy demand calculated with the target road load coefficients f0, f1, and f2, for each applicable phase.

              The corrected road load coefficients f0a, f1a and f2a, shall be calculated according to the following equations:

              where:

                          Ad_alt, Bd_alt and Cd_alt are the chassis dynamometer setting coefficients after the alternative warm-up procedure;

                          Ad_WLTC, Bd_WLTC

                          and Cd_WLTC are the chassis dynamometer setting coefficients after a WLTC warm-up procedure described in paragraph 7.3.4.1. of this annex and a valid chassis dynamometer load setting according to paragraph 8. of this annex.

              7.3.4.3.4. The corrected road load coefficients f0a, f1a and f2a, shall be used only for the purpose of paragraph 7.3.4.3.3. of this annex. For other purposes, the target road load coefficients f0, f1 and f2, shall be used as the target road load coefficients.