Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p12
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 12/108)
Character Range: 917397–920250

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 an individual vehicle shall be calculated according to paragraph 5.1.2. of this annex.
              5.1.1. For the calculation of the road load of vehicles of a road load matrix family, the vehicle parameters described in paragraph 4.2.1.4. of this annex and the road load coefficients of the representative test vehicle determined in paragraph 4.3. of this annex shall be used.
              5.1.1.1. The road load force for an individual vehicle shall be calculated using the following equation:
              where:
              Fc is the calculated road load force as a function of vehicle velocity, N;
              f0 is the constant road load coefficient, N, defined by the equation:
f0 = Max((0.05 × f0r + 0.95 × (f0r × TM/TMr + × 9.81 × TM));
(0.2 × f0r + 0.8 × (f0r × TM/TMr +  × 9.81 × TM)))
                  f0r is the constant road load coefficient of the representative vehicle of the road load matrix family, N;
                  f1 is the first order road load coefficient, N/(km/h), and shall be set to  zero;
                  f2 is the second order road load coefficient, N/(km/h)², defined by the equation:
f2 = Max((0.05 × f2r + 0.95 × f2r × Af / Afr); (0.2 × f2r + 0.8 × f2r × Af / Afr))
                  f2r is the second order road load coefficient of the representative vehicle of the road load matrix family, N/(km/h)²;
              v is the vehicle speed, km/h;
                  TM is the actual test mass of the individual vehicle of the road load matrix family, kg;
                  TMr is the test mass of the representative vehicle of the road load matrix family, kg;
                  Af  is the frontal area of the individual vehicle of the road load matrix family, m²,
                  Afr is the frontal area of the representative vehicle of the road load matrix family, m2;
                  RR is the tyre rolling resistance of the individual vehicle of the road load matrix family, kg/tonne;
                  RRr is the tyre rolling resistance of the representative vehicle of the road load matrix family, kg/tonne.
              For the tyres fitted to an individual vehicle, the value of the rolling resistance RR shall be set to the class value of the applicable tyre energy efficiency class according to Table A4/2 of Annex B4.
              If the tyres on the front and rear axles belong to different energy efficiency classes, the weighted mean shall be used, calculated using the equation in paragraph 3.2.3.2.2.2. of Annex B7.
              If the same tyres were fitted to test vehicles L and H, the value of RRind when