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Commission Regulation (EU) 2017/2400Show full title
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)
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- Revised 01/09/20203.68 MB
- Revised 01/03/20193.55 MB
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Appendix 3 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
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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