Inertia Dynamometer Test. 4.1. Equipping the dynamometer For testing purposes, the dynamometer shall be fitted out with the original brake caliper. The inertia dynamometer shall be equipped with a constant torque device and equipment for recording rotational speed, brake pressure, the number of revolutions after braking has commenced, brake torque, the braking period and the temperature of the brake discs on a continuous basis.
4.2. Test conditions
4.2.1. Inertia mass of the inertia dynamometer The inertia mass of the inertia dynamometer shall be set as close as possible, with a permissible variation of ± 5 per cent, to the theoretically required value which corresponds to that part of the total inertia of the vehicle braked by the appropriate wheel. The formula used for calculation purposes is as follows: I = m rdyn² Where: I = rotary inertia (kgm2); rdyn = dynamic rolling radius of the tyre (m); m = test mass (part of the maximum mass of the vehicle braked by the appropriate wheel) as stipulated by this Regulation.
4.2.1.1. Dynamic rolling radius In calculating the inertia mass, the dynamic rolling radius (rdyn) of the largest tyre authorised for the vehicle shall be taken into account.
4.2.1.2. Test mass The test mass for calculating the inertia mass shall be as follows:
(a) When testing front wheel brake disc:
(b) When testing rear wheel brake disc:
0.0.0. Vehicle category Percentage by mass m to be taken into account X values (front wheel with 1 disc) X values (front wheel with 2 discs) Y values (rear axle)
Inertia Dynamometer Test. 4.5.2.1. The test shall be carried out on a single brake assembly.
4.5.2.2. The test machine shall be capable of generating the inertia required by paragraph 4.5.2.5. of this annex.
4.5.2.3. The test machine shall be calibrated for speed and brake output torque within an accuracy of 2 per cent.
4.5.2.4. The instrumentation for the test shall be capable of providing at least the following data:
4.5.2.4.1. A continuous recording of brake application pressure or force.
Inertia Dynamometer Test
