Division 3.1: Efficiency of the 48V motor generator - Commission Implementing Decision (EU) 2019/313 of 21 February 2019 on the approval of the technology used in SEG Automotive Germany GmbH High efficient 48V motor generator (BRM) plus 48V/12V DC/DC converter for use in conventional combustion engine and certain hybrid powered light commercial vehicles as an innovative technology for reducing CO2 emissions from light commercial vehicles pursuant to Regulation (EU) No 510/2011 of the European Parliament and of the Council (Text with EEA relevance)

The efficiency of the 48V motor generator shall be determined in accordance with ISO 8854:2012, with the exception of the elements specified in this section.

Evidence shall be provided to the type approval authority that the rotational frequency ranges of the efficient 48V 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 48V motor generator current intensity shall be defined as half of the rated current for all operating points. For each rotational frequency, the voltage and the output current of the motor generator shall be kept constant, the voltage at 52V.

Table 1

Operating points

Operating pointi	Holding time[s]	Rotational frequencyn_i [min^{– 1}]	Frequencyh_i
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 Formula 1:

Formula 1

All efficiency measurements are to be performed consecutively at least five (5) times. The average of the measurements at each operating point ( $\bar{η_{{MG}_{i}}}$ ) shall be calculated.

The efficiency of the generation function (η_MG) shall be calculated in accordance with the following Formula 2:

Formula 2

Division 3.1 Efficiency of the 48V motor generator