Division 8.2.3 Downscaling procedure for Class 3 vehicles

F1Figure A1/16 shows an example for a downscaled extra high speed phase of the Class 3 WLTC.

For the Class 3 cycle, the downscaling period is the time period between second 1533 and second 1762. Within this time period, the acceleration for the original cycle shall be calculated using the following equation:

a_{{orig}_{i}} = \frac{v_{i + 1} - v_{i}}{3,6}

where:

v_i

is the vehicle speed, km/h;

is the time between second 1533 and second 1762.

The downscaling shall be applied first in the time period between second 1533 and second 1724. Second 1724 is the time when the maximum speed of the extra high speed phase is reached. The downscaled speed trace shall be subsequently calculated using the following equation:

v_{{dsc}_{i + 1}} = v_{{dsc}_{i}} + a_{{orig}_{i}} \times (1 - f_{dsc}) \times 3,6

for i = 1533 to 1723.

For i = 1533, $v_{{dsc}_{i}} = v_{{orig}_{i}}$

In order to meet the original vehicle speed at second 1763, a correction factor for the deceleration shall be calculated using the following equation:

f_{corr_dec} = \frac{v_{dsc_1724} - 82,6}{v_{orig_1724} - 82,6}

82.6 km/h is the original vehicle speed at second 1763.

The downscaled vehicle speed between second 1725 and second 1762 shall be subsequently calculated using the following equation:

v_{{dsc}_{i}} = v_{{dsc}_{i - 1}} + a_{{orig}_{i - 1}} \times f_{corr_dec} \times 3,6

for i = 1725 to 1762.

Annotations

Textual amendments

F1: Substituted by Commission Regulation (EU) 2018/1832 of 5 November 2018 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) 2017/1151 for the purpose of improving the emission type approval tests and procedures for light passenger and commercial vehicles, including those for in-service conformity and real-driving emissions and introducing devices for monitoring the consumption of fuel and electric energy (Text with EEA relevance).