PROCEDURE FOR PRODUCTION CONFORMITY TESTING WHEN STANDARD DEVIATION IS SATISFACTORY

Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles (Text with EEA relevance) · European Union

This Appendix describes the procedure to be used to verify production conformity for the emissions of pollutants when the manufacturer's production standard deviation is satisfactory. With a minimum sample size of three engines the sampling procedure is set so that the probability of a lot passing a test with 40 % of the engines defective is 0,95 (producer's risk = 5 %) while the probability of a lot being accepted with 65 % of the engines defective is 0,10 (consumer's risk = 10 %). The following procedure is used for each of the pollutants given in Section 6.2.1 of Annex I (see Figure 2): | Let: | L = the natural logarithm of the limit value for the pollutant; χi = the natural logarithm of the measurement for the i-th engine of the sample; s = an estimate of the production standard deviation (after taking the natural logarithm of the measurements); n = the current sample number. For each sample the sum of the standardised deviations to the limit is calculated using the following formula: Then: if the test statistic result is greater than the pass decision number for the sample size given in Table 3, a pass decision is reached for the pollutant; if the test statistic result is less than the fail decision number for the sample size given in Table 3, a fail decision is reached for the pollutant; otherwise, an additional engine is tested according to Section 9.1.1.1 of Annex I and the calculation procedure is applied to the sample increased by one more unit. Table 3 Pass and fail decision numbers of Appendix 1 sampling plan Minimum sample size: 3

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.