# 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 5: Calculation of cycle energy demand


Unless otherwise specified, the calculation shall be based on the target speed trace given in discrete time sample points.
For the calculation, each time sample point shall be interpreted as a time period. Unless otherwise specified, the duration Δt of these periods shall be 1 second.
The total energy demand E for the whole cycle or a specific cycle phase shall be calculated by summing Ei over the corresponding cycle time between tstart and tend according to the following equation:
E=∑tstarttend Eiwhere:
Ei=Fi× di if Fi> 0
Ei=0 if Fi≤ 0
and:
tstartis the time at which the applicable test cycle or phase starts, s;
tendis the time at which the applicable test cycle or phase ends, s;
Eiis the energy demand during time period (i-1) to (i), Ws;
Fiis the driving force during time period (i-1) to (i), N;
diis the distance travelled during time period (i-1) to (i), m.
Fi=f0+ f1×vi+ vi− 12+ f2×vi+ vi− 124+1.03× TM× aiwhere:
Fiis the driving force during time period (i-1) to (i), N;
viis the target velocity at time ti, km/h;
TMis the test mass, kg;
aiis the acceleration during time period (i-1) to (i), m/s2;
f0, f1, f2 are the road load coefficients for the test vehicle under consideration (TML, TMH or TMind) in N, N/km/h and in N/(km/h)2 respectively.
di=vi+ vi− 12× 3,6×ti− ti− 1where:
diis the distance travelled in time period (i-1) to (i), m;
viis the target velocity at time ti, km/h;
tiis time, s.
ai=vi− vi− 13,6×ti− ti− 1where:
aiis the acceleration during time period (i-1) to (i), m/s2;
viis the target velocity at time ti, km/h;
tiis time, s.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/7/division/division/5. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/7/division/division-5.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.