# 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), 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/2019/313/annex/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-313/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.