Division 4.4.3.2 Measurement precision

The measurements shall be carried out in opposite directions until a minimum of three pairs of measurements at each reference speed v_i have been obtained, for which $\bar{C_{j}}$ satisfies the precision ρ_j according to the following equation:

ρ_{j} = \frac{h \times s}{\sqrt{n} \times \bar{C_{j}}} \leq 0.03

where:

is the number pairs of measurements for C_jm;

\bar{C_{j}}

is the running resistance at the speed v_j, Nm, given by the equation:

{\bar{C}}_{j} = \frac{1}{n} \sum_{n}^{i = 1} C_{jmi}

where:

C_jmi

is the arithmetic average torque of the i^th pair of measurements at speed v_j, Nm, and given by:

C_{jmi} = \frac{1}{2} \times (C_{jmai} + C_{jmbi})

where:

C_jmai and C_jmbi are the arithmetic average torques of the i^th measurement at speed v_j determined in paragraph 4.4.3.1. of this Sub-Annex for each direction, a and b respectively, Nm;

is the standard deviation, Nm, calculated using the following equation:

s = \sqrt{\frac{1}{k - 1} \sum_{k}^{i = 1} {(C_{jmi} - \bar{C_{j}})}^{2}};

F1h

is a coefficient as a function of n as given in Table A4/4 in paragraph 4.3.1.4.2. of this Sub-Annex.

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).