Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:1714:p3
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 1714 (pt 3/15)
Character Range: 696951–700046

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:
           for i = 1726 to 1742.
              8.2.3. Downscaling procedure for Class 3 cycles
              This paragraph is only applicable for Level 1A;
              Figure A1/16 shows an example for a downscaled extra high speed phase of the Class 3 WLTC.
Figure A1/16
Downscaled extra high speed phase of the Class 3 WLTC
              For the Class 3 cycle, the downscaling period is the time period between second 1533 and second 1762. 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 1533 and second 1762.
              The downscaling shall be applied first in the time period between second 1533 and second 1724. Second 1724 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 = 1533 to 1723.
              For i = 1533,
              In order to meet the original vehicle speed at second 1763, a correction factor for the deceleration shall be calculated using the following equation:
           82.6 km/h is the original vehicle speed at second 1763.
              The downscaled vehicle speed between second 1725 and second 1762 shall be subsequently calculated using the following equation:
           For i = 1725 to 1762
              8.3. Determination of the downscaling factor (as applicable)
              The downscaling factor  is a function of the ratio  between the maximum required power of the cycle phases where the downscaling is to be applied and the rated power of the vehicle, .
              The maximum required power  (in kW) is related to a specific time i and the corresponding vehicle speed vi in the cycle trace and is calculated using the following equation:

              where:
                     f0, f1, f2 are the applicable road load coefficients, N, N/(km/h), and N/(km/h)² respectively;
                     TM is the applicable test mass, kg;
                     vi  is the speed at time i, km/h;
                     ai  is the acceleration at time i, m/s².
              The cycle time i at which maximum power or power values close to maximum power is required is second 764 for the Class 1 cycle, second 1574 for the Class 2 cycle and second 1566 for the Class 3 cycle.
              The corresponding vehicle speed values,  and acceleration values, , are as follows:
               km/h,  m/s² for Class 1,
               km/h,  m/s² for Class 2,
               km/h,  m/s² for Class 3.
               shall be calculated using the following equation:
              The downscaling factor, , shall be calculated using the following equations:
    if ,