# 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 6.2.4: Approval criteria


The facility or combination of facilities used shall be approved if both of the following two criteria are fulfilled:
(a)The difference in cycle energy, expressed as εk, between the wind tunnel method and the coastdown method shall be within ± 0,05 for each of the three vehicles k according to the following equation:
εk=Ek,WTMEk,coastdown− 1where:
εkis the difference in cycle energy over a complete Class 3 WLTC for vehicle k between the wind tunnel method and the coastdown method, per cent;
Ek, WTMis the cycle energy over a complete Class 3 WLTC for vehicle k, calculated with the road load derived from the wind tunnel method (WTM) calculated according to paragraph 5 of Sub-Annex 7, J;
Ek, coastdownis the cycle energy over a complete Class 3 WLTC for vehicle k, calculated with the road load derived from the coastdown method calculated according to paragraph 5. of Sub-Annex 7, J.; and
(b)The arithmetic average x– of the three differences shall be within 0,02.
x–=ε1+ ε2+ ε33The approval shall be recorded by the approval authority including measurement data and the facilities concerned.
The facility may be used for road load determination for a maximum of two years after the approval has been granted.
Each combination of roller chassis dynamometer or moving belt and wind tunnel shall be approved separately.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/6./division/6.2./division/6.2.4. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-6./division-6.2./division-6.2.4.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.