Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p29
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 29/108)
Character Range: 966109–969380

Verification
              8.2.3.1. The target running resistance (torque) curve shall be determined using the equation in paragraph 4.5.5.2.1. of this annex and may be written as follows:
              8.2.3.2. The simulated running resistance (torque) curve on the chassis dynamometer shall be calculated according to the method described and the measurement precision specified in paragraph 4.4.3.2. of this annex, and the running resistance (torque) curve determination as described in paragraph 4.4.4. of this annex with applicable corrections according to paragraph 4.5. of this annex, all with the exception of measuring in opposite directions, resulting in a simulated running resistance curve:
              The simulated running resistance (torque) shall be within a tolerance of ±10 N×r' from the target running resistance at every speed reference point where r' is the dynamic radius of the tyre in metres on the chassis dynamometer obtained at 80 km/h.
              If the tolerance at any reference speed does not satisfy the criterion of the method described in this paragraph, the procedure specified in paragraph 8.2.3.3. of this annex shall be used to adjust the chassis dynamometer load setting.
              8.2.3.3. Adjustment
              The chassis dynamometer load setting shall be adjusted using the following equation:
              therefore:
              where:
                       is the new chassis dynamometer setting load, N;
                      Fej is the adjustment road load equal to (Fsj-Ftj), Nm;
                      Fsj is the simulated road load at reference speed vj, Nm;
                      Ftj is the target road load at reference speed vj, Nm;
                       are the new chassis dynamometer setting coefficients;
                      r' is the dynamic radius of the tyre on the chassis dynamometer obtained at 80 km/h, m.
              Paragraphs 8.2.2. and 8.2.3. of this annex shall be repeated until the tolerance in paragraph 8.2.3.2. of this annex is met.
              8.2.3.4. The mass of the driven axle(s), tyre specifications and chassis dynamometer load setting shall be recorded when the requirement of paragraph 8.2.3.2. of this annex is fulfilled.
              8.2.4. Transforming running resistance coefficients to road load coefficients f0, f1, f2
              8.2.4.1. If the vehicle does not coast down in a repeatable manner and a vehicle coastdown mode according to paragraph 4.2.1.8.5. of this annex is not feasible, the coefficients f0, f1 and f2 in the road load equation shall be calculated using the equations in paragraph 8.2.4.1.1. of this annex. In any other case, the procedure described in paragraphs 8.2.4.2. to 8.2.4.4. inclusive of this annex shall be performed.
              8.2.4.1.1.
              where:
                   c0, c1, c2 are the running resistance coefficients determined in paragraph 4.4.4. of this annex, Nm, Nm/(km/h), Nm/(km/h)²;
                   r is the dynamic tyre radius of the vehicle with which the running resistance was determined, m;
                   1.02 is an approximate coefficient compensating for drivetrain losses.
              8.2.4.1.2. The determined f0, f1, f2 values shall not be used for a chassis dynamometer setting or