Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:23:p9
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 23 (pt 9/15)
Character Range: 1921695–1924566

of this Regulation.

               In the case of vehicles equipped with periodically regenerating systems as defined in paragraph 3.8.1. of this Regulation, it shall be checked that the vehicle is not approaching a regeneration period. If this is the case, the vehicle shall be driven until the end of the regeneration. If a regeneration occurs during the emissions measurement, a new test (including preconditioning) shall be performed, and the first result not taken into account.

               All exhaust emissions results shall be plotted as a function of the running distance on the system rounded to the nearest kilometre and the best fit straight line fitted by the method of least squares shall be drawn through all these data points.

               For Level 1A

              The data will be acceptable for use in the calculation of the deterioration factor only if the interpolated 5,000 km and target useful life points on this line are within the above mentioned limits.

               The data are still acceptable when a best fit straight line crosses an applicable limit with a negative slope (the 5,000 km interpolated point is higher than the target useful life point) but the target useful life actual data point is below the limit.

               For Level 1B

              The data will be acceptable for use in the calculation of the deterioration factor only if the extrapolated 3,000 km and the target useful life points on this line are within the above mentioned limits.

              7.1. A multiplicative exhaust emission deterioration factor shall be calculated for each pollutant as follows:

           Where:
           Mi1 =
                  For Level 1A mass emission of the pollutant i in g/km interpolated to 5,000 km,

                  For Level 1B - mass emission of the pollutant i in g/km extrapolated to 3,000 km
              Mi2 =  mass emission of the pollutant i in g/km interpolated to the target useful life
These interpolated values shall be carried out to a minimum of four places to the right of the decimal point before dividing one by the other to determine the deterioration factor. The result shall be rounded to three places to the right of the decimal point.
               If a deterioration factor is less than one, it is deemed to be equal to one.

              At the request of a manufacturer, an additive exhaust emission deterioration factor shall be calculated for each pollutant as follows:

           D . E . F . = Mi2 – Mi1
              If the additive deterioration factor calculated with the above formula is negative, then it shall be put equal to zero.
These additive deterioration factors shall follow the same rules described for the multiplicative deterioration factors in relation to Level 1A (4 phase WLTP) and Level 1B (3 phase WLTP).
Annex C4 - Appendix 1

Standard Bench Cycle