# 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 7.1: Simulation of the fuel consumption

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

The input data and input information for the simulation tool for the verification test shall be the following:
(a) The certified CO 2 emissions and fuel consumption related properties of the following components, separate technical units or systems:
(i) engines;
(ii) transmissions;
(iii) torque converters;
(iv) other torque transferring components;
(v) additional driveline components;
(vi) axles.
(b) The input data set out in Table 4.
The power calculated by the simulation tool by the equations of longitudinal dynamics from the measured vehicle speed and road gradient course may be used for plausibility checks to test if the total simulated cycle work is similar to the measured value.
The simulation tool shall calculate the gears engaged during the verification test by calculating the engine speeds per gear at the actual vehicle speed and selecting the gear that provides the engine speed closest to the measured engine speed.
The measured wheel power shall replace in the verification test mode of the simulation tool the simulated power demand at the wheels. The measured engine speed and the gear defined in the verification test input data shall replace the corresponding simulation part. The standard fan power in the simulation tool shall be replaced by the fan power calculated from the measured fan speed in the simulation tool as follows:
P fan = C1 × RPM fan C2 3 × D fan C3 5
where:
P fan fan power to be used in the simulation for the verification test [kW]
RPM fan measured rotational speed of the fan [1/s]
D fan diameter of the fan [m]
C1, C2, C3 generic parameters in the simulation tool:
C1 7 320 W
C2 1 200 rpm
C3 810 mm
The steering pump, compressor and generator shall be attributed standard values in accordance with Annex IX.
All other simulation steps and data handling concerning axle, transmission and engine efficiency shall be identical to the application of the simulation tool to determine and declare the CO 2 emissions and fuel consumption of new vehicles.
The simulated fuel consumption value shall be the total fuel flow over the verification test relevant test distance, from the end of the zeroing after the warm up phase to the end of the test. The total verification test relevant test distance shall be calculated from the vehicle speed signal.
The results from the simulation tool for the verification test shall be calculated as follows:
FC sim = ∑ end t = 0 FC sim t : fs VT work
where:
VT work Verification test work calculated by the simulation tool for the complete fuel consumption measurement phase [kWh]
VT work = ∑ end t = 0 P wheel-i 3600 × fs
FC sim Fuel consumption simulated by the simulation tool over the complete fuel consumption measurement phase [g/kWh]
fs Simulation rate [Hz]
FC sim(t) Instantaneous fuel consumption simulated by the simulation tool over the test [g/s]

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/Xa/division/7/division/7.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-Xa/division-7/division-7.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.