Division 3 DETERMINATION OF THE EFFICIENCY
United Kingdom
The motor-generator efficiency shall be determined in accordance with ISO 8854:2012, with the exception of the elements specified in this point.
Evidence shall be provided to the F1Secretary of State that the speed ranges of the 12 volt motor-generator are consistent with those set out in Table 1. The measurements shall be conducted at different operating points, as set out in Table 1. The current intensity of the motor-generator shall be defined as half of the rated current for all operating points. For each speed the voltage and the output current of the motor-generator shall be kept constant at 14,3 volt.
Table 1
| Operating pointi | Holding time[s] | Rotational frequency | Frequencyhi |
|---|---|---|---|
| 1 | 1 200 | 1 800 | 0,25 |
| 2 | 1 200 | 3 000 | 0,40 |
| 3 | 600 | 6 000 | 0,25 |
| 4 | 300 | 10 000 | 0,10 |
The efficiency at each operating point shall be calculated in accordance with the following Formula 1.
Annotations
Textual amendments
- F1
Words in Annex point 3 substituted (31.12.2020) by The Road Vehicle Carbon Dioxide Emission Performance Standards (Cars and Vans) (Amendment) (EU Exit) Regulations 2020 (S.I. 2020/1418), regs. 1(3), 8(5)(a)