Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:1714:p9
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 1714 (pt 9/15)
Character Range: 712467–715380

rounding process according to paragraph 6.1.8. of this Regulation for nadd,exhigh.
              10. Allocation of cycles to vehicles
              10.1. A vehicle of a certain class shall be tested on the cycle of the same class, i.e. Class 1 vehicles on the Class 1 cycle, Class 2 vehicles on the Class 2 cycle, Class 3a vehicles on the Class 3a cycle, and Class 3b vehicles on the Class 3b cycle. However, at the request of the manufacturer and with approval of the responsible authority, a vehicle may be tested on a numerically higher cycle class, e.g. a Class 2 vehicle may be tested on a Class 3 cycle. In this case the differences between Classes 3a and 3b shall be respected and the cycle may be downscaled according to paragraphs 8. to 8.4. inclusive of this annex.

Annex B2

Gear selection and shift point determination for vehicles equipped with manual transmissions
              1. General approach
              1.1. The shifting procedures described in this annex shall apply to vehicles equipped with manual shift transmissions.
              1.2. The prescribed gears and shifting points are based on the balance between the power required to overcome driving resistance and acceleration, and the power provided by the engine in all possible gears at a specific cycle phase.
              1.3. The calculation to determine the gears to use shall be based on engine speeds and full load power curves versus engine speed.
              1.4. For vehicles equipped with a dual-range transmission (low and high), only the range designed for normal on-road operation shall be considered for gear use determination.
              1.5. The prescriptions for clutch operation shall not be applied if the clutch is operated automatically without the need of an engagement or disengagement of the driver.
              1.6. This annex shall not apply to vehicles tested according to Annex B8.
              2. Required data and precalculations
              The following data are required and calculations shall be performed in order to determine the gears to be used when driving the cycle on a chassis dynamometer:
                  (a)  Prated, the maximum rated engine power as declared by the manufacturer, kW;
                  (b) nrated, the rated engine speed declared by the manufacturer as the engine speed at which the engine develops its maximum power, min-1;
                  (c) nidle, idling speed, min-1.
                  nidle shall be measured over a period of at least 1 minute at a sampling rate of at least 1 Hz with the engine running in warm condition, the gear lever placed in neutral, and the clutch engaged. The conditions for temperature, peripheral and auxiliary devices, etc. shall be the same as described in Annex B6 for the Type 1 test.
                  The value to be used in this annex shall be the arithmetic average over the measuring period and rounded according