# 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 3.1

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

Option 1: Measurement of the torque independent losses, calculation of the torque dependent losses.
The torque loss Tl ,in on the input shaft of the transmission shall be calculated by
Tl,in (nin , Tin , gear) = T l,in,min_loss + fT * Tin + floss_corr * Tin + T l,in,min_el + fel_corr * Tin
The correction factor for the torque dependent hydraulic torque losses shall be calculated by
floss_corr=Tl,in,max_loss−Tl,in,min_lossTmax,inThe correction factor for the torque dependent electric torque losses shall be calculated by
fel_corr=Tl,in,max_el−Tl,in,min_elTmax,inThe torque loss at the input shaft of the transmission caused by the power consumption of transmission electric auxiliary shall be calculated by
Tl,in,el=Pel0,7×nin×2π60where:
Tl,in Torque loss related to input shaft [Nm]
Tl,in,min_loss Torque independent loss at minimum hydraulic loss level (minimum main pressure, cooling/lubrication flows etc.), measured with free rotating output shaft from testing without load [Nm]
Tl,in,max_loss Torque independent loss at maximum hydraulic loss level (maximum main pressure, cooling/lubrication flows etc.), measured with free rotating output shaft from testing without load [Nm]
floss_corr Loss correction for hydraulic loss level depending on input torque [-]
nin Speed at the transmission input shaft (downstream of torque converter, if applicable) [rpm]
fT Torque loss coefficient = 1 – ηT
Tin Torque at the input shaft [Nm]
ηT Torque dependent efficiency (to be calculated); for a direct gear fT = 0,007 (ηT = 0,993) [-]
fel_corr Loss correction for electric power loss level depending on input torque [-]
Tl,in, el Additional torque loss on input shaft by electric consumers [Nm]
Tl,in,min_el Additional torque loss on input shaft by electric consumers corresponding to minimum electric power [Nm]
Tl,in,max_el Additional torque loss on input shaft by electric consumers corresponding to maximum electric power [Nm]
Pel Electric power consumption of electric consumers in transmission measured during transmission loss testing [W]
Tmax,in Maximum allowed input torque for any forward gear in the transmission [Nm]

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/VI/division/3/division/3.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/division-3/division-3.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.