# Commission Implementing Decision of 27 June 2013 on the approval of the Valeo Efficient Generation Alternator 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to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance) (2013/341/EU) (repealed), Division 7: Calculation of the accountable share of the mechanical power saving

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

The high efficient alternator leads to the saved mechanical power which is to be calculated in two steps. In the first step the saved mechanical power is to be calculated under ‘real world’ conditions. The second step is to calculate the saved mechanical power under type approval conditions. Subtracting these 2 mechanical power savings is to result in the accountable share of the saved mechanical power.
The saved mechanical power under ‘real world’ conditions is to be calculated with formula (6).
Formula (6) ΔΡ m − RW = P RW ∕ η Α − P RW ∕ η Α − EI
Where:
ΔΡm–RW Saved mechanical power under real world conditions (W);
PRW Electric power under real world conditions, which is 750 W;
ηΑ Efficiency of the baseline alternator;
ηΑ–EI Efficiency of the high efficient alternator
The saved mechanical power under type-approval conditions is to be calculated with formula (7).
Formula (7) ΔΡ m − TA = P TA ∕ η Α − P TA ∕ η Α − EI
Where:
ΔΡm–TA Saved mechanical power under type approval conditions (W);
PTA Electric power under type approval conditions, which is 350 W;
ηΑ Efficiency of the baseline alternator;
ηΑ–EI Efficiency of the high efficient alternator
The accountable share of saved mechanical power is calculated with formula (8).
Formula (8) ΔΡ m = ΔΡ m − RW − ΔΡ m − TA
Where:
ΔΡm Accountable share of saved mechanical power (W);
ΔΡm–RW Saved mechanical power under real world conditions (W);
ΔΡm–TA Saved mechanical power under type approval conditions (W);

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Source: https://www.legislation.gov.uk/eudn/2013/341/annex/division/7 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-341/annex/division-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.