Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p18
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 18/28)
Character Range: 842317–845163

of 10 km/h and with the highest reference speed according to the following provisions:
                  (a) The highest reference speed point shall be 130 km/h or the reference speed point immediately above the maximum speed of the applicable test cycle if this value is less than 130 km/h. In the case that the applicable test cycle contains less than the 4 cycle phases (Low, Medium, High and Extra High) and at the request of the manufacturer and with approval of the responsible authority, the highest reference speed may be increased to the reference speed point immediately above the maximum speed of the next higher phase, but no higher than 130 km/h; in this case road load determination and chassis dynamometer setting shall be done with the same reference speed points;
                  (b) If a reference speed point applicable for the cycle plus 14 km/h is more than or equal to the maximum vehicle speed vmax, this reference speed point shall be excluded from the coastdown test and from chassis dynamometer setting. The next lower reference speed point shall become the highest reference speed point for the vehicle.
              2.3. Unless otherwise specified, a cycle energy demand shall be calculated according to paragraph 5. of Annex B7 over the target speed trace of the applicable drive cycle.
              2.4. f0, f1, f2 are the road load coefficients of the road load equation F = f0 + f1 × v + f2 × v2 determined according to this annex.
                  f0 is the constant road load coefficient and shall be rounded according to paragraph 6.1.8. of this Regulation to one place of decimal, N;
                  f1 is the first order road load coefficient and shall be rounded according to paragraph 6.1.8. of this Regulation to three places of decimal, N/(km/h);
                  f2 is the second order road load coefficient and shall be rounded according to paragraph 6.1.8. of this Regulation to five places of decimal, N/(km/h)².
              Unless otherwise stated, the road load coefficients shall be calculated with a least square regression analysis over the range of the reference speed points.
              2.5. Rotational mass
              2.5.1. Determination of mr
              mr is the equivalent effective mass of all the wheels and vehicle components rotating with the wheels on the road while the gearbox is placed in neutral, in kilograms (kg). mr shall be measured or calculated using an appropriate technique agreed upon by the responsible authority. Alternatively, mr may be estimated to be 3 per cent of the sum of the mass in running order and 25 kg.
              2.5.2. Application of rotational mass to the road load
              Coastdown times shall be transferred to forces and vice versa by taking into account the applicable test mass plus mr. This shall apply to measurements