# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 4.5


The resulting CO2 mass emission difference for the considered period j due to load behaviour of the alternator for charging a REESS shall be calculated using the following equation:
ΔMCO2,j=0,0036×ΔEREESS,j×1ηalternator×Willansfactor×1dj
where:
ΔMCO2,jis the resulting CO2 mass emission difference of period j, g/km;
ΔEREESS,jis the REESS energy change of the considered period j calculated in accordance with paragraph 4.1. of this Appendix, Wh;
djis the driven distance of the considered period j, km;
jis the index number for the considered period, where a period shall be any applicable cycle phase, combination of cycle phases and the applicable total cycle;
0,0036is the conversion factor from Wh to MJ;
ηalternatoris the efficiency of the alternator in accordance with paragraph 4.4. of this Appendix;
Willansfactoris the combustion process-specific Willans factor as defined in Table A6.App2/3, gCO2/MJ;

---
Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/6n2/division/division/4./division/4.5. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/6n2/division/division-4./division-4.5.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.