Division 4.4.4 Running resistance curve determination

F1The arithmetic average speed and arithmetic average torque at each reference speed point shall be calculated using the following equations:

V_{jm} = ½ \times (v_{jma} + v_{jmb})

C_{jm} = ½ \times (C_{jma} + C_{jmb})

The following least squares regression curve of arithmetic average running resistance shall be fitted to all the data pairs (v_jm, C_jm) at all reference speeds described in paragraph 4.4.2.1. of this Sub-Annex to determine the coefficients c₀, c₁ and c₂.

The coefficients, c₀, c₁ and c₂, and as well as the coastdown times measured on the chassis dynamometer (see paragraph 8.2.4. of this Sub-Annex) shall be included in all relevant test sheets.

In the case that the tested vehicle is the representative vehicle of a road load matrix family, the coefficient c₁ shall be set to zero and the coefficients c₀ and c₂ shall be recalculated with a least squares regression analysis.

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).