Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p4
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 4/18)
Character Range: 201910–204929

sampling frequency of 10 Hz. It is allowed to use the OBD acceleration control position signal for this purpose. The responsible authority may request the manufacturer to evaluate this signal to ensure that the test result is performed correctly.

              1.7. After the initial tests, the test vehicle shall be run-in under normal driving conditions. OVC-HEVs shall be driven predominantly in charge-sustaining operating conditions. The driving pattern, test conditions and fuel during the run-in shall be in accordance with the manufacturer's engineering judgement. The run-in distance shall be less than or equivalent to the distance driven during the run-in of the vehicle which was tested for the type approval of the interpolation family, in accordance with paragraph 2.3.3. of Annex B6 or paragraph 2. of Annex B8.

              1.8. After the run-in, the test vehicle shall be tested according to the Type 1 test procedure specified in Annex B6 and Annex B8. The test shall be repeated until the following number of valid test results have been obtained:

               For Level 1A and Level 1B criteria emissions: three tests

               For Level 1B fuel efficiency and/or electric energy consumption: two tests

               Drive trace indexes shall be calculated according to paragraph 7. of Annex B7 and these shall fulfil the criteria specified in paragraph 2.6.8.3.1.4. of Annex B6.

              These tests shall be performed in the same test cell as used for the tests prior to the run-in and by applying the same chassis dynamometer setting method. If this is not possible, the manufacturer shall justify the reason for using a different test cell. The system odometer setting Di in km shall be recorded prior to each test. The measured criteria emissions, CO2 emissions, fuel efficiency and electric energy consumption, as applicable and in accordance with paragraph 8.2.4.1. of this Regulation, shall be calculated according to Step 4a of Table A7/1 in Annex B7 or Step 4a of Table A8/5 in Annex B8.

              1.9. For Level 1A only:

               For the determination of the run-in factor for the CO2 emissions, the coefficients CRI and Cconst in the following equation shall be calculated by a least squares regression analysis to four significant digits on all valid tests before and after the run-in:

               where:

                     MCO2,i is the measured CO2 emission for test i, g/km

                     CRI  is the slope of the logarithmic regression line

                     Cconst is the constant value of the logarithmic regression line

               In the case that multiple vehicles have been tested, the CRI shall be calculated for each vehicle, and the resulting values shall be averaged. The manufacturer will provide statistical evidence to the responsible authority that the fit is sufficiently statistically justified.

              1.9.1. For Level 1A only:

              Based on the deviation of the measurements from the fit,