Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p106
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 106/108)
Character Range: 1188088–1191354

average  values calculated in accordance with paragraph 3.4. of this Annex B6b.

              The best fit of the data shall be calculated using the least square regression method. An example for this regression line (Veline line) is shown in Figure A6b /1.

              Figure A6b/1.
              Example of the Veline regression line.

              3.7. The vehicle specific Veline equation-1 calculated from paragraph 3.6. of this Annex B6b defines the correlation between CO2 emissions in g/s for the considered phase j and the average measured power at the wheel for the same phase j and is expressed with the following equation:

               = (kv,1 x ) + Dv,1

              where:

                      is the average CO2 emission of phase j, g/s;

                      is the average actual/measured power of the considered phase j calculated using POVERRUN,1, kW;

                     kv,1 is the slope of the Veline equation-1, g CO2/kWs;

                     Dv,1 is the constant of the Veline equation-1, g CO2/s.

              3.8. In the next step, a second POVERRUN,2 is calculated following the equation:

              POVERRUN,2 = - Dv,1/ kv,1

              where:

                     POVERRUN,2 is the second overrun power, kW;

                     kv,1 is the slope of the Veline equation-1, g CO2/kWs;

                     Dv,1 is the constant of the Veline equation-1, g CO2/s.

              3.9. All calculated  and  values from paragraph 3.1. of this Annex B6b that are below POVERRUN,2 shall be set to POVERRUN,2 in order to exclude negative values not relevant for the CO2 emissions.

              3.10. The  values shall be computed again for each individual phase of the WLTC using the equations from paragraph 3.4. of this Annex B6b.

              3.11. New vehicle specific Veline equation-2 shall be computed using the least square regression method described in paragraph 3.6. of this Annex B6b. The Veline equation-2 is expressed with the following equation:

               = (kv,2 x ) + Dv,2

              where:

                      is the average CO2 emission of phase j, g/s;

                      is the average actual/measured power of the considered phase j calculated using POVERRUN,2, kW;

                     kv,2 is the slope of the Veline equation-2, g CO2/kWs;

                     Dv,2 is the constant of the Veline equation-2, g CO2/s.

              3.12. In the next step, the  values coming from the target speed profile shall be calculated for each individual phase of the WLTC using the following equation:

               = /n

              where:

                      is the average target power of the considered phase j calculated using POVERRUN,2, kW;

                      is the target power during the period from (i-1) to (i) calculated using POVERRUN,2, kW;

                      is the time at the beginning of the considered phase j, s;

                      is the time at the end of the considered phase j, s;

                     n is the number of time steps in the considered phase;

                     j is the index number for the considered WLTC phase.

              3.13. Delta in CO2 emissions of period j expressed in g/s is then calculated following