Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p19
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 19/32)
Character Range: 1323008–1326082

as a result of the design of the vehicle.
              The on-board diagnostics (OBD) or electronic control unit (ECU) monitoring (data collection) system may be used in order to detect the position of the accelerator control. The collection of OBD and/or ECU data shall not influence the vehicle's emissions or performance.
              7.2. Calculation of drive trace indices
              The following indices shall be calculated according to SAE J2951(Revised JAN2014):
                  (a) IWR Inertial Work Rating, per cent;
                  (b) RMSSE Root Mean Squared Speed Error, km/h.
              7.3. (Reserved)
              7.4. Vehicle-specific application of drive trace indices
              7.4.1. Pure ICE vehicles, NOVC-HEVs, NOVC-FCHVs
              The drive trace indices IWR and RMSSE shall be calculated for the applicable test cycle and reported.
              7.4.2. OVC-HEVs
              7.4.2.1. Charge-sustaining Type 1 test (paragraph 3.2.5. of Annex B8)
              The drive trace indices IWR and RMSSE shall be calculated for the applicable test cycle and reported.
              7.4.2.2. Charge-depleting Type 1 test (paragraph 3.2.4.3. of Annex B8)
              If the number of charge-depleting Type 1 test cycles is less than four, the drive trace indices IWR and RMSSE shall be calculated for each individual applicable test cycle of the charge-depleting Type 1 test and reported.
              If the number of charge-depleting Type 1 test cycles is greater than or equal to four, the drive trace indices IWR and RMSSE shall be calculated for each individual applicable test cycle of the charge-depleting Type 1 test and reported. In this case, the average IWR and the average RMSSE for the combination of any two cycles within the charge-depleting test shall be compared with the respective criteria specified in paragraph 2.6.8.3.1.3. of Annex B6, and the calculated IWR of any individual cycle within the charge-depleting test shall not be less than -3.0 nor greater than +5.0 per cent.
              7.4.2.3. City cycle test (paragraph 3.2.4.3. of Annex B8 replacing WLTC with WLTCcity)
              For the application of the drive trace index calculation, two consecutively driven city test cycles (L and M) shall be considered as one cycle.
              For the city cycle during which the combustion engine starts to consume fuel, the drive indices IWR and RMSSE shall not be calculated individually. Instead, depending on the number of completed city cycles before the city cycle during which the combustion engine starts, the incomplete city cycle shall be combined with the previous city cycles as follows and shall be considered as one cycle in the context of the drive trace index calculations.
              If the number of completed city cycles is even, the incomplete city cycle shall be combined with the previous two completed city cycles. See the example in Figure A7/1 below.
Figure A7/1
Example with an even number of completed city test cycles before the city cycle where the combustion engine start