Regulation (EU) No 540/2014 of the European Parliament and of the CouncilShow full title

2. MEASURING METHOD U.K.

2.1 Measuring instruments and condition of measurements U.K.

Unless otherwise specified, the measuring instruments, the conditions of the measurements and the condition of the vehicle are equivalent to those specified in points 2 and 3 of Annex II.

If the vehicle has different modes that affect sound emission, all modes shall comply with the requirements of this Annex. In the case where the manufacturer has performed tests to prove to the approval authority compliance with those requirements, the modes used during those tests shall be reported in a test report.

2.2. Method of testing U.K.

Unless otherwise specified, the conditions and procedures of points 4.1 to 4.1.2.1.2.2 of Annex II shall be used. For the purpose of this Annex, single test runs shall be measured and evaluated.

2.3. Control range U.K.

Operation conditions are as follows:

Vehicle speed V_{AA ASEP}:

v_AA ≥ 20 km/h

Vehicle acceleration a_{wot ASEP}

a_wot ≤ 5,0 m/s²

Engine speed n_{BB ASEP}

n_BB ≤ 2,0 * PMR^–0,222 * s or

n_BB ≤ 0,9 * s, whichever is the lowest

Vehicle speed V_{BB ASEP}:

if n_{BB ASEP} is reached in one gear

v_BB ≤ 70 km/h

in all other cases

v_BB ≤ 80 km/h

gears

K ≤ gear ratio i as determined in Annex II

If the vehicle, in the lowest valid gear, does not achieve the maximum engine speed below 70 km/h, the vehicle speed limit is 80 km/h.

2.4. Gear ratios U.K.

The ASEP requirements apply to every gear ratio K that leads to test results within the control range as defined in point 2.3 of this Annex.

In case of vehicles with automatic transmissions, adaptive transmissions and CVTs tested with non-locked gear ratios, the test may include a gear ratio change to a lower range and a higher acceleration. A gear change to a higher range and a lower acceleration is not allowed. A gear shift which leads to a condition that is not in compliance with the boundary conditions shall be avoided. In such a case, it is permitted to establish and use electronic or mechanical devices, including alternate gear selector positions. In order for the ASEP test to be representative and repeatable (to the approval authority), the vehicles shall be tested using production gearbox calibration.

2.5. Target conditions U.K.

The sound emission shall be measured in each valid gear ratio at the four test points as specified below.

The first test point P₁ is defined by using an entry speed v_AA of 20 km/h. If a stable acceleration condition cannot be achieved, the speed shall be increased in steps of 5 km/h until a stable acceleration is reached.

The fourth test point P₄ is defined by the maximum vehicle speed at BB' in that gear ratio within the boundary conditions in accordance with point 2.3.

The other two test points are calculated using the following formula:

Test Point P_j: v_{BB_j} = v_{BB_1} + ((j – 1)/3) * (v_{BB_4 – vBB_1}) for j = 2 and 3

Where:

v_{BB_1}

=

vehicle speed at BB' of test point P₁

v_{BB_4}

=

vehicle speed at BB' of test point P₄

Tolerance for v_{BB_j}: ±3 km/h

For all test points the boundary conditions as specified in point 2.3 shall be met.

2.6. Test of the vehicle U.K.

The path of the centreline of the vehicle shall follow line CC' as closely as possible throughout the entire test, starting from the approach to line AA' until the rear of the vehicle passes line BB'.

At line AA' the accelerator shall be fully depressed. To achieve a more stable acceleration or to avoid a down shift between line AA' and BB' pre-acceleration before line AA' may be used. The accelerator shall be kept in depressed condition until the rear of the vehicle reaches line BB'.

For every separate test run, the following parameters shall be determined and noted:

The maximum A-weighted sound pressure level of both sides of the vehicle, indicated during each passage of the vehicle between the two lines AA' and BB', shall be mathematically rounded to the first decimal place (L_wot,kj). If a sound peak obviously out of character with the general sound pressure level is observed, the measurement shall be discarded. Left and right side may be measured simultaneously or separately.

The vehicle speed readings at AA' and BB' shall be reported with the first significant digit after the decimal place (v_AA,kj; v_BB,kj).

If applicable, the engine speed readings at AA' and BB' shall be reported as a full integer value (n_AA,kj; n_BB,kj).

The calculated acceleration shall be determined in accordance to the formula in point 4.1.2.1.2 of Annex II and reported to the second digit after the decimal place (a_wot,test,kj).