Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p19
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 19/28)
Character Range: 844901–847964

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 on the road as well as on a chassis dynamometer.
              2.5.3. Application of rotational mass for the inertia setting
              If the vehicle is tested on a dynamometer in 4WD operation, the equivalent inertia mass of the chassis dynamometer shall be set to the applicable test mass.'
              Otherwise, the equivalent inertia mass of the chassis dynamometer shall be set to the test mass plus either the equivalent effective mass of the wheels not influencing the measurement results or 50 per cent of mr.
              2.6.  Additional masses for setting the test mass shall be applied such that the weight distribution of that vehicle is approximately the same as that of the vehicle with its mass in running order. In the case of Category N vehicles or passenger vehicles derived from Category N vehicles, the additional masses shall be located in a representative manner and shall be justified to the responsible authority upon their request. The weight distribution of the vehicle shall be recorded and shall be used for any subsequent road load determination testing.
              3. General requirements
              The manufacturer shall be responsible for the accuracy of the road load coefficients and shall ensure this for each production vehicle within the road load family. Tolerances within the road load determination, simulation and calculation methods shall not be used to underestimate the road load of production vehicles. At the request of the responsible authority, the accuracy of the road load coefficients of an individual vehicle shall be demonstrated.
              3.1. Overall measurement accuracy, precision, resolution and frequency
              The required overall measurement accuracy shall be as follows:
                  (a) Vehicle speed accuracy: ±0.2 km/h with a measurement frequency of at least 10 Hz;
                  (b) Time: min. accuracy: ±10 ms; min. precision and resolution: 10 ms;
                  (c) Wheel torque accuracy: ±6 Nm or ±0.5 per cent of the maximum measured total torque, whichever is greater, for the whole vehicle, with a measurement frequency of at least 10 Hz;
                  (d) Wind speed accuracy: ±0.3 m/s, with a measurement frequency of at least 1 Hz;
                  (e) Wind direction accuracy: ±3°, with a measurement frequency of at least 1 Hz;
                  (f) Atmospheric temperature accuracy: ±1 °C, with a measurement frequency of at least 0.1 Hz;
                  (g) Atmospheric pressure accuracy: ±0.3 kPa, with a measurement frequency of at least 0.1 Hz;
                  (h) Vehicle mass accuracy measured on the same weighing scale before and after the test: ±10 kg (±20 kg for vehicles > 4,000 kg);
                  (i) Tyre pressure accuracy: ±5 kPa;
                  (j)