# 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 3.2.2.1: To calculate HC mass emission for compression-ignition engines, the arithmetic average HC concentration shall be calculated using the following equation:


Ce=∫t1t2CHCdtt2− t1
where:
∫t1t2CHCdtis the integral of the recording of the heated FID over the test (t1 to t2);
Ceis the concentration of HC measured in the diluted exhaust in ppm of Ci and is substituted for CHC in all relevant equations.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/7/division/division/3./division/3.2./division/3.2.2./division/3.2.2.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/7/division/division-3./division-3.2./division-3.2.2./division-3.2.2.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.