Division 2 DETERMINATION OF THE EFFICIENCY OF THE 12V MOTOR GENERATOR
United Kingdom
The efficiency of the 12V motor-generator shall be determined in accordance with ISO 8854:2012, with the following precisions.
The manufacturer shall provide evidence to the F1Secretary of State that the frequency ranges of the 12V motor-generator are the same as or equivalent to those set out in Table 1.
The efficiency of the 12V motor-generator shall be determined on the basis of measurements at each of the operating points listed in Table 1.
The current intensity of the 12V motor-generator at each operating point shall be half the rated current. For each operating point, the voltage and the output current of the 12V motor-generator shall be kept constant during the measurement, with the voltage at 14,3 V.
Table 1
| Operating pointi | Holding time[s] | Rotational frequencyni [min–1] | Frequency of operating pointshi |
|---|---|---|---|
| 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 of the 12V motor-generator at each operating point i (
Annotations
Textual amendments
- F1
Words in Annex point 2 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), 12(5)(a)