# 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), Appendix 3

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

Calculation of the standard torque loss
The standard torque losses for axles are shown in Table 1. The standard table values consist of the sum of a generic constant efficiency value covering the load dependent losses and a generic basic drag torque loss to cover the drag losses at low loads.
Tandem axles shall be calculated using a combined efficiency for an axle including drive-thru (SRT, HRT) plus the matching single axle (SR, HR).
Table 1
Generic efficiency and drag loss
Basic function
Generic efficiencyη
Drag torque(wheel side)Td0 = T0 + T1 * igear
Single reduction axle (SR)
0,98
T0 = 70 Nm
T1 = 20 Nm
Single reduction tandem axle (SRT) /
single portal axle (SP)
0,96
T0 = 80 Nm
T1 = 20 Nm
Hub reduction axle (HR)
0,97
T0 = 70 Nm
T1 = 20 Nm
Hub reduction tandem axle (HRT)
0,95
T0 = 90 Nm
T1 = 20 Nm
The basic drag torque (wheel side) Td0 is calculated by
Td0 = T0 + T1 * igear
using the values from Table 1.
The standard torque loss Tloss,std on the wheel side of the axle is calculated by
T loss,std = T d 0 + T out η − T out
where:
Tloss,std Standard torque loss at the wheel side [Nm]
Td0 Basis drag torque over the complete speed range [Nm]
igear Axle gear ratio [-]
η Generic efficiency for load dependent losses [-]
Tout Output torque [Nm]

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