# Commission Implementing Decision (EU) 2019/314 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 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 3.3: Total efficiency and saved mechanical power

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

The total efficiency of the 48 V motor generator plus the 48V/12V DC/DC converter shall be calculated using Formula 3:
Formula 3
η TOT = η MG × η DC ∕ DC – The 48 V motor generator plus the 48V/12V DC/DC converter generation function lead to saved mechanical power under real-world conditions (ΔPmRW) and type approval NEDC conditions (ΔPmTA) as set out in Formula 4.
Formula 4
ΔPm = ΔPmRW – ΔPmTA
Where the saved mechanical power under real-world conditions (ΔPmRW) shall be calculated in accordance with Formula 5 and the saved mechanical power under type-approval NEDC conditions (ΔPmTA) in accordance with Formula 6:
Formula 5
ΔP mRW = P RW η B − P RW η TOT
Formula 6
ΔP mTA = P TA η B − P TA η TOT
where
PRW Power requirement under ‘real-world’ conditions [W], which is estimated at 750W
PTA Power requirement under NEDC type-approval conditions [W], which is estimated at 350W
ηB Efficiency of the baseline alternator [%], which is 67 %

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Source: https://www.legislation.gov.uk/eudn/2019/314/annex/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-314/annex/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.