# Commission Implementing Decision (EU) 2017/785 of 5 May 2017 on the approval of efficient 12 V motor-generators for use in conventional combustion engine powered passenger cars as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance), Division 3: Measurements and determination of the efficiency

Extent: E+W+S+N.I.

The efficiency of the 12 V motor generator 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 type approval authority that the speed ranges of the efficient 12 V 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 efficient 12 V motor generator current intensity shall be defined as half of the rated current for all operating points. For each speed the voltage and the output current of the alternator shall be kept constant at 14,3 V.
Table 1
Operating points
Operating pointi
Holding time[s]
Rotational frequencyni[min– 1]
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:

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Source: https://www.legislation.gov.uk/eudn/2017/785/annex/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-785/annex/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.