# 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 8.2.1: Initial load setting


For a chassis dynamometer of coefficient control, the chassis dynamometer power absorption unit shall be adjusted with the arbitrary initial coefficients, Ad, Bd and Cd, of the following equation:
Fd=Ad+ Bdv+ Cdv2where:
Fdis the chassis dynamometer setting load, N;
vis the speed of the chassis dynamometer roller, km/h.
The following coefficients are recommended for the initial load setting:
(a)Ad=0,5×atr′, Bd=0,2×btr′, Cd=ctr′for single-axis chassis dynamometers, or
Ad=0,1×atr′, Bd=0,2×btr′, Cd=ctr′for dual-axis chassis dynamometers, where:
at, bt and ct are are the target running resistance coefficients; and
r′ is the dynamic radius of the tyre on the chassis dynamometer obtained at 80 km/h, m.; or
(b)Empirical values, such as those used for the setting for a similar type of vehicle.
For a chassis dynamometer of polygonal control, adequate load values at each reference speed shall be set for the chassis dynamometer power absorption unit.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/8./division/8.2./division/8.2.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-8./division-8.2./division-8.2.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.