Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:1714:p2
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 1714 (pt 2/15)
Character Range: 694220–697237

profile using the downscaling procedure. The modified vehicle speed values calculated according to paragraphs 8.2.1. to 8.2.3. shall be rounded according to paragraph 6.1.8. of this Regulation to 1 place of decimal in a final step.
              8.2.1. Downscaling procedure for Class 1 cycles
               Figure A1/14 shows an example of a downscaled medium speed phase of the Class 1 WLTC.
Figure A1/14
Downscaled medium speed phase of the Class 1 WLTC
              For the Class 1 cycle, the downscaling period is the time period between second 651 and second 906. Within this time period, the acceleration for the original cycle shall be calculated using the following equation:
           where:
            is the vehicle speed, km/h;
           i is the time between second 651 and second 906.
              The downscaling shall be applied first in the time period between second 651 and second 848. The downscaled speed trace shall be subsequently calculated using the following equation:
              with i = 651 to 847
              For i = 651,
              In order to meet the original vehicle speed at second 907, a correction factor for the deceleration shall be calculated using the following equation:
           where 36.7 km/h is the original vehicle speed at second 907.
              The downscaled vehicle speed between second 849 and second 906 shall be subsequently calculated using the following equation:
           For i = 849 to 906
              8.2.2. Downscaling procedure for Class 2 cycles
              This paragraph is only applicable for Level 1A;
              Since the driveability problems are exclusively related to the extra high speed phases of the Class 2 and Class 3 cycles, the downscaling is related to those time periods of the extra high speed phases where driveability problems are expected to occur (see Figures A1/15 and A1/16).
Figure A1/15
Downscaled extra high speed phase of the Class 2 WLTC
              For the Class 2 cycle, the downscaling period is the time period between second 1520 and second 1742. Within this time period, the acceleration for the original cycle shall be calculated using the following equation:

           where:
            is the vehicle speed, km/h;
           i is the time between second 1520 and second 1742.
              The downscaling shall be applied first to the time period between second 1520 and second 1725. Second 1725 is the time when the maximum speed of the extra high speed phase is reached. The downscaled speed trace shall be subsequently calculated using the following equation:
           for i = 1520 to 1724.
           For i = 1520, .
              In order to meet the original vehicle speed at second 1743, a correction factor for the deceleration shall be calculated using the following equation:
           90.4 km/h is the original vehicle speed at second 1743.
              The downscaled vehicle speed between second 1726 and second 1742 shall be calculated using the following equation: