Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:1714:p10
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 1714 (pt 10/15)
Character Range: 715132–718053

temperature, peripheral and auxiliary devices, etc. shall be the same as described in Annex B6 for the Type 1 test.
                  The value to be used in this annex shall be the arithmetic average over the measuring period and rounded according to paragraph 6.1.8. of this Regulation to the nearest 10 min-1;
                  (d) ng, the number of forward gears.
                  The forward gears in the transmission range designed for normal on-road operation shall be numbered in descending order of the ratio between engine speed in min-1 and vehicle speed in km/h. Gear 1 is the gear with the highest ratio, gear ng is the gear with the lowest ratio. ng determines the number of forward gears;
                  (e) (n/v)i, the ratio obtained by dividing the engine speed n by the vehicle speed v for each gear i, for i = 1 to ng, min-1/(km/h). (n/v)i shall be calculated according to the equations in paragraph 8. of Annex B7;
                  (f) f0, f1, f2, road load coefficients selected for testing, N, N/(km/h), and N/(km/h)² respectively;
              (g) nmax
                  nmax1 = n95_high, the maximum engine speed where 95 per cent of rated power is reached, min – 1;
                  If n95_high cannot be determined because the engine speed is limited to a lower value nlim for all gears and the corresponding full load power is higher than 95 per cent of rated power, n95_high shall be set to nlim.
                   nmax2 = (n/v)( ngvmax) × vmax,cycle
nmax3 = (n/v)( ngvmax) × vmax,vehicle
                  where:
                  vmax,cycle  is the maximum speed of the vehicle speed trace according to Annex B1, km/h;
                         vmax,vehicle  is the maximum speed of the vehicle according to paragraph 2.(i) of this annex, km/h;
                         (n/v)(ngvmax)  is the ratio obtained by dividing engine speed n by the vehicle speed v for the gear ngvmax, min-1/(km/h );
                         ngvmax  is defined in paragraph 2.(i) of this annex;
                         nmax  is the maximum of nmax1, nmax2 and nmax3, min-1.
                  (h) Pwot(n), the full load power curve over the engine speed range
                  The power curve shall consist of a sufficient number of data sets (n, Pwot) so that the calculation of interim points between consecutive data sets can be performed by linear interpolation. Deviation of the linear interpolation from the full load power curve according to UN Regulation No. 85 shall not exceed 2 per cent. The first data set shall be at nmin_drive_set (see (k)(3) below) or lower. The last data set shall be at nmax or higher engine speed. Data sets need not be spaced equally but all data sets shall be reported.
                  The data sets and the values Prated and nrated shall be taken from the power curve as declared by the manufacturer.
                  The full load power at engine speeds not covered