EN
L 290/238
Official Journal of the European Union
10.11.2022
For each second j of the cycle trace, the power required to overcome driving resistance and to accelerate shall be calculated using the following equation:
A Prequired;j ¼
ðf0 þ vj Þ þ ðf1 þ v2j Þ þ ðf2 þ v3j Þ
3600
!
þ
ðkr Ü aj Ü vj Ü TMÞ 3600
where: Prequired,j is the required power at second j, kW; aj
is the vehicle acceleration at second j, m/s2, and is calculated as follows: aj ¼
ðvjþ1 Ä vj Þ 3:6 Ü ðtjþ1 Ä tj Þ
j = tstart to tend – 1, tstart is the time at which the applicable test cycle starts (see paragraph 3 of Annex B1 of this Regulation), s; tend
is the time at which the applicable test cycle ends (see paragraph 3 of Annex B1 of this Regulation), s;
The acceleration value at second tend (second 1 611 for class 1 cycle and second 1 800 for class 2 and 3 cycles) may be set to 0 in order to avoid empty cells.
kr is a factor taking the inertial resistances of the drivetrain during acceleration into account and is set to 1.03. 3.2.
Determination of engine speeds For any vj < 1.0 km/h, it shall be assumed that the vehicle is standing still and the engine speed shall be set to nidle.
The gear lever shall be placed in neutral with the clutch engaged except 1 second before beginning an acceleration 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: ni,j = (n/v)i × vj 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 to (c) specified above can be expressed as follows for deceleration phases: