Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:20:p13
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 20 (pt 13/23)
Character Range: 179270–182112

the case of gaseous reference fuels, either paragraph 1.1.1. or paragraph 1.2. of Annex 10a.

             When testing a vehicle against the emission limit values given in row B of the table in paragraph 5.3.1.4. of this Regulation, the appropriate reference fuel must comply with the specifications given in paragraph 2. of Annex 10 or, in the case of gaseous reference fuels, either paragraph 1.1.2. or paragraph 1.2. of Annex 10a.

           3.2.1.   Vehicles that are fuelled either with petrol or with LPG or NG shall be tested according to Annex 12 with the appropriate reference fuel(s) as defined in Annex 10a.

           4.   TEST EQUIPMENT

           4.1.   Chassis dynamometer

           4.1.1.   The dynamometer shall be capable of simulating road load within one of the following classifications:

           dynamometer with fixed load curve, i.e. a dynamometer whose physical characteristics provide a fixed load curve shape,
           dynamometer with adjustable load curve, i.e. a dynamometer with at least two road load parameters that can be adjusted to shape the load curve.

           4.1.2.   The setting of the dynamometer shall not be affected by the lapse of time. It shall not produce any vibrations perceptible to the vehicle and likely to impair the vehicle's normal operations.

           4.1.3.   It shall be equipped with means to simulate inertia and load. These simulators are connected to the front roller in the case of a two-roller dynamometer.

           4.1.4.   Accuracy

           4.1.4.1.   It shall be possible to measure and read the indicated load to an accuracy of  5 per cent.

           4.1.4.2.   In the case of a dynamometer with a fixed load curve, the accuracy of the load setting at 80 km/h shall be  5 per cent. In the case of a dynamometer with adjustable load curve, the accuracy of matching dynamometer load to road load shall be  5 per cent at 120, 100, 80, 60, and 40 km/h and  10 per cent at 20 km/h. Below this, dynamometer absorption shall be positive.

           4.1.4.3.   The total inertia of the rotating parts (including the simulated inertia where applicable) shall be known and shall be within  20 kg of the inertia class for the test.

           4.1.4.4.   The speed of the vehicle shall be measured by the speed of rotation of the roller (the front roller in the case of a two-roller dynamometer). It shall be measured with an accuracy of  1 km/h at speeds above 10 km/h.

           4.1.4.5.   The distance actually driven by the vehicle shall be measured by the movement of rotation of the roller (the front roller in the case of a two-roller dynamometer).

           4.1.5.   Load and inertia setting

           4.1.5.1.   Dynamometer with fixed load curve: the load simulator shall be adjusted to absorb the power exerted on the driving wheels at