Commission Implementing Decision (EU) 2018/2079Show full title

6. DEFINITION OF THE MODIFIED TESTING CONDITIONS U.K.

6.1. Definition of the Coast Down Curve U.K.

The determination of the coast down curve in coasting mode shall be carried out on a chassis dynamometer and following these two compulsory steps:

• Bringing the vehicle to operating temperature using the preconditioning procedure;

• Executing a coast down in coasting mode from 125 km/h to either a standstill or to the lowest possible coasting speed.

6.2. Generation of the modified NEDC Speed Profile (mNEDC) U.K.

The speed profile of the mNEDC shall be generated according to the following rules:

• The test sequence is composed of an urban cycle made of four elementary urban cycles and an extra-urban cycle;

• All acceleration ramps are identical to the NEDC-profile;

• All constant speed levels are identical to the NEDC-profile;

• The deceleration values when coasting function is deactivated are equal to the ones within the NEDC-profile;

• The speed and time tolerances shall be in accordance with paragraph 1.4 of Annex 7 to UN/ECE Regulation No 101.

• The deviation from the NEDC profile shall be minimised and the overall distance must comply with the NEDC specified tolerances;

• The distance at the end of each deceleration phase of the mNEDC-profile shall be equal to the distances at the end of each deceleration phase of the NEDC-profile;

• For all phases of acceleration, constant velocity and deceleration, standard NEDC tolerances shall be applied.

• During coasting phases the ICE is decoupled and no active correction of the vehicles velocity trajectory is permitted.

• Lower speed limit for coasting v_min: The coasting mode has to be disabled at the lower speed limit (15 km/h) for coasting by pressing the brake pedal.

• Minimal stop time: The minimum time after every coasting deceleration to a standstill or constant speed phase is 2 seconds ( in Figure 1).

• Minimum duration for constant speed phases: The minimum duration for constant speed phases after acceleration or coasting deceleration shall be at least 2 seconds ( in Figure 1).

• During the deceleration phases, the coasting mode can be enabled if the speed is below v_max, v_max being the maximum speed of the test cycle.

• The coasting mode may be disabled for speeds higher than v_min.

Figure 1 Illustration of parameters used to generate mNEDC U.K.

Shift profile generation for vehicles with manual gearbox U.K.

For vehicles equipped with manual gearboxes, the gearshift table shall be adapted using the following assumptions:

1.

The gearshift selection during vehicle acceleration remains as defined for the NEDC

2.

the timing for the downshifts of the modified NEDC differ from the one of the NEDC in order to avoid downshifts during coasting phases (e.g. anticipated before deceleration phases)

The pre-defined shift points for the ECE portion of the NEDC cycle are modified as described in the following table:

¹ PM = gearbox in neutral, clutch engaged. K1, K2 = first or second gear engaged, clutch disengaged. U.K.