# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 5.1: Calculation of engine work

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

Total engine work over a cycle or a defined period shall be determined from the recorded values of engine power determined in accordance with paragraph 3.1.2 of this Annex and paragraphs 6.3.5 and 7.4.8 of Annex 4 to UN/ECE Regulation 49 Rev.06.
The engine work over a complete testcycle or over each WHTC-sub-cycle shall be determined by integrating of recorded values of engine power in accordance with the following formula:
W act,i = 1 2 P 0 + P 1 + P 2 + … + P n − 2 + P n − 1 + 1 2 P n h where:
Wact, i total engine work over the time period from t0 to t1
t0 time at the start of the time period
t1 time at the end of the time period
n number of recorded values over the time period from t0 to t1
Pk [0 … n] recorded engine power values over the time period from t0 to t1 in chronological order, where k runs from 0 at t0 to n at t1
h interval width between two adjacent recorded values defined by h = t 1 − t 0 n

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/V/division/5/division/5.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-V/division-5/division-5.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.