For four control areas one point shall be selected, measured and evaluated according to the full procedure as described in section 4.4. Each control point shall be selected in the following manner:

1. (i)

   The control areas shall be selected depending on the axle line:

   • SR axles including tandem combinations: Control areas 5, 6, 8 and 9

   • HR axles including tandem combinations: Control areas 2, 3, 4 and 5

2. (ii)

   The selected point shall be located in the centre of the area referring to the speed range and the applicable torque range for the according speed.

3. (iii)

   In order to have a corresponding point for comparison with the loss map measured for certification, the selected point shall be moved to the closest measured point from the approved map.

For each measured point of the conformity of the certified CO₂ emissions and fuel consumption related properties test and its corresponding point of the type approved map, the efficiency shall be calculated with:

ηi=Toutiaxle×Tin

where:

η_i

Efficiency of the grid point from each single control area 1 to 9

T_out

Output torque [Nm]

T_in

Input torque [Nm]

i_axle

axle ratio [-]

The average efficiency of the control area shall be calculated as follows:

• For SR axles:

  • ${\eta }_{\mathrm{avr,mid\; speed}}=\frac{{\eta }_5+{\eta }_6}{2}$
  • ${\eta }_{\mathrm{avr,high\; speed}}=\frac{{\eta }_8+{\eta }_9}{2}$
  • ${\eta }_{\mathrm{avr,total}}=\frac{{\eta }_{\mathrm{avr,mid\; speed}}+{\eta }_{\mathrm{avr,high\; speed}}}{2}$

• For HR axles:

  • ${\eta }_{\mathrm{avr,low\; speed}}=\frac{{\eta }_2+{\eta }_3}{2}$
  • ${\eta }_{\mathrm{avr,mid\; speed}}=\frac{{\eta }_4+{\eta }_5}{2}$
  • ${\eta }_{\mathrm{avr,total}}=\frac{{\eta }_{\mathrm{avr,low\; speed}}+{\eta }_{\mathrm{avr,mid\; speed}}}{2}$

where:

η_{avr,low speed}

average efficiency for low speed

η_{avr,mid speed}

average efficiency for mid speed

η_{avr,high speed}

average efficiency for high speed

η_avr,total

simplified averaged efficiency for axle

If the conformity of the certified CO₂ emissions and fuel consumption related properties assessment is performed in accordance with 6.1. c), the drag torque of the parent axle of the family to which the tested axle belongs shall be determined during the certification. This can be done prior to the run-in procedure or after the run-in procedure according to paragraph 3.1 or by linear extrapolation of all the torque map values for each speed step downwards to 0 Nm.

For determination of the drag torque of an axle a simplified test set-up with one electric machine and one torque sensor on the input side is required.

The test conditions according to paragraph 4.1 shall apply. The uncertainty calculation regarding torque may be omitted.

The drag torque shall be measured in the speed range of the approved type according to paragraph 4.3.4 under consideration of the speed steps according to 4.3.5.

A conformity of the certified CO₂ emissions and fuel consumption related properties test is passed when one of the following conditions apply:

1. (a)

   If a torque loss measurement according to 6.1(a) or (b) is conducted, the average efficiency of the tested axle during conformity of the certified CO₂ emissions and fuel consumption related properties procedure shall not deviate more than 1,5 % for SR axles and 2,0 % for all other axles lines from corresponding average efficiency the type approved axle.

2. (b)

   If a measurement of drag torque according to 6.1(c) is conducted, the deviation of the drag torque of the tested axle during conformity of the certified CO₂ emissions and fuel consumption related properties procedure shall not be higher than indicated in table 2

i

gear ratio.