Division 8.2.2 Downscaling procedure for Class 2 vehiclesF1

Since the driveability problems are exclusively related to the extra high speed phases of the Class 2 and Class 3 cycles, the downscaling is related to those time periods of the extra high speed phases where driveability problems are expected to occur (see Figures A1/15 and A1/16).

For the Class 2 cycle, the downscaling period is the time period between second 1520 and second 1742. 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 1520 and second 1742.

The downscaling shall be applied first to the time period between second 1520 and second 1725. Second 1725 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 = 1520 to 1724.

For i = 1520, $v_{{dsc}_{i}} = v_{{orig}_{i}}$

In order to meet the original vehicle speed at second 1743, a correction factor for the deceleration shall be calculated using the following equation:

f_{corr_dec} = \frac{v_{dsc_1725} - 90,4}{v_{orig_1725} - 90,4}

90,4 km/h is the original vehicle speed at second 1743.

The downscaled vehicle speed between second 1726 and second 1742 shall be 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 = 1726 to 1742.

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).