Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:1714:p14
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 1714 (pt 14/15)
Character Range: 726331–729108

from standstill where first gear shall be selected with the clutch disengaged.
              For each vj ≥ 1.0 km/h of the cycle trace and each gear i, i = 1 to ng the engine speed, ni,j , shall be calculated using the following equation:
              The calculation shall be performed with floating point numbers; the results shall not be rounded.
              3.3. Selection of possible gears with respect to engine speed
              The following gears may be selected for driving the speed trace at vj:
                  (a)  All gears i < ngvmax where nmin_drive ≤ ni,j ≤ nmax1;
           (b)  All gears i ≥ ngvmax where nmin_drive ≤ ni,j ≤ nmax2;
           (c)  Gear 1, if n1,j < nmin_drive.
              If aj < 0 and ni,j ≤ nidle, ni,j shall be set to nidle and the clutch shall be disengaged.
              If aj ≥ 0 and ni,j < max (1.15 × nidle ; min. engine speed of the Pwot(n) curve), ni,j shall be set to the maximum of (1.15 × nidle) or the min. engine speed of the Pwot(n) curve, and the clutch shall be set to "undefined".
              "Undefined" covers any status of the clutch between disengaged and engaged, depending on the individual engine and transmission design. In such a case, the real engine speed may deviate from the calculated engine speed.
              With regard to the definition of nmin_drive in paragraph 2 (k) the requirements (a) to (c) specified above can be expressed as follows for deceleration phases:
              During a deceleration phase, gears with ngear > 2 shall be used as long as the engine speed does not drop below nmin_drive.
              Gear 2 shall be used during a deceleration phase within a short trip of the cycle (not at the end of a short trip) as long as the engine speed does not drop below (0.9 × nidle).
              If the engine speed drops below nidle, the clutch shall be disengaged.
              If the deceleration phase is the last part of a short trip shortly before a stop phase, the second gear shall be used as long as the engine speed does not drop below nidle. This requirement shall be applied to the whole deceleration phase ending at standstill.
              A deceleration phase is a time period of more than 2 seconds with a vehicle speed ≥ 1.0 km/h and with strictly monotonic decrease of vehicle speed (see paragraph 4. of this annex).
              3.4. Calculation of available power
              For each engine speed value nk of the full load power curve as specified in paragraph 2 (h) of this annex the available power, Pavailable_k, shall be calculated using the following equation:

                   where:
                    is the power available at nk at full load condition from the full load power curve;
                    is a safety margin accounting