Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p11
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 11/108)
Character Range: 914542–917673

K1 is the test mass correction as defined in paragraph 4.5.4. of this annex;
                  K2 is the correction factor for air resistance as defined in paragraph 4.5.1. of this annex;
           v is the vehicle velocity, km/h;
                  T is the arithmetic average atmospheric temperature during all valid run pairs, °C;
                  w2 is the wind resistance correction as defined in paragraph 4.5.3. of this annex.
              4.5.5.2.2. Correction for installed torque meters
              If the running resistance is determined according to the torque meter method, the running resistance shall be corrected for effects of the torque measurement equipment installed outside the vehicle on its aerodynamic characteristics.
              The running resistance coefficient c2 shall be corrected using the following equation:
                                  c2corr = K2 × c2 × (1 + (∆(CD × Af))/(CD' × Af'))
              where:
              ∆(CD × Af) = (CD × Af) - (CD' × Af');
                   CD' × Af' is the product of the aerodynamic drag coefficient multiplied by the frontal area of the vehicle with the torque meter measurement equipment installed measured in a wind tunnel fulfilling the criteria of paragraph 3.2. of this annex, m²;
                   CD × Af  is the product of the aerodynamic drag coefficient multiplied by the frontal area of the vehicle with the torque meter measurement equipment not installed measured in a wind tunnel fulfilling the criteria of paragraph 3.2. of this annex, m².
              4.5.5.2.3. Target running resistance coefficients
              The result of the calculation below shall be used as the target running resistance coefficient at in the calculation of the chassis dynamometer load setting described in paragraph 8.2. of this annex:
              .
              The result of the calculation below shall be used as the target running resistance coefficient bt in the calculation of the chassis dynamometer load setting described in paragraph 8.2. of this annex:
                          (c1 × (1 + K0 × (T-20))).
              The result of the calculation below shall be used as the target running resistance coefficient ct in the calculation of the chassis dynamometer load setting described in paragraph 8.2. of this annex:
                             (c2corr × r).
              5. Method for the calculation of road load or running resistance based on vehicle parameters
              5.1. Calculation of road load and running resistance for vehicles based on a representative vehicle of a road load matrix family
              If the road load of the representative vehicle is determined according to a coastdown method described in paragraph 4.3. of this annex or according to the wind tunnel method described in paragraph 6. of this annex, the road load of an individual vehicle shall be calculated according to paragraph 5.1.1. of this annex.
              If the running resistance of the representative vehicle is determined according to the torque meter method described in paragraph 4.4. of this annex, the running resistance of