# Commission Implementing Decision (EU) 2020/1167 of 6 August 2020 on the approval of the technology used in a 48 Volt efficient motor-generator combined with a 48 Volt/12 Volt DC/DC converter for use in conventional combustion engine and certain hybrid electric passenger cars and light commercial vehicles as an innovative technology pursuant to Regulation (EU) 2019/631 of the European Parliament and of the Council) (Text with EEA relevance), Division 2.1: 48V motor-generator efficiency

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

The efficiency of the 48V motor-generator shall be determined in accordance with ISO 8854:2012, with the following precisions.
The manufacturer shall provide evidence to the type-approval authority that the frequency ranges of the 48V motor-generator are the same as or equivalent to those set out in Table 1.
The efficiency of the 48V 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 48V motor-generator at each operating point shall be half the rated current. For each operating point, the voltage and the output current of the 48V motor-generator shall be kept constant during the measurement, with the voltage at 52V.
Table 1
Operating pointi
Holding time[s]
Rotational frequency
Frequency of operating points
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 48V motor-generator at each operating point i ( ) [%] shall be calculated in accordance with Formula 1.
Formula 1
where, for each operating point i,
Ui is the voltage [V];
Ii is the current intensity [A];
Μi is the torque [Nm];
ni is the rotational frequency [min-1].
For each operating point, the measurements are to be performed at least five times consecutively and the efficiency shall be calculated for each of those measurements with j being the index referring to one set of measurements.
For each operating point, the average of those efficiencies shall be calculated.
The efficiency of the 48V motor-generator [%] shall be calculated in accordance with Formula 2.
Formula 2
where
is the mean efficiency of the 48V motor-generator determined for operating point i [%]
hi is the frequency of operating point i, as set out in Table 1.

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Source: https://www.legislation.gov.uk/eudn/2020/1167/annex/division/2/division/2.1 (the official version)
Page: https://openlegislation.uk/eu-decision-2020-1167/annex/division-2/division-2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.