Document ID: chunk:federal_register_of_legislation:F2022C00213:reg:120:p38
Version: federal_register_of_legislation:F2022C00213
Segment Type: reg
Provision Reference: reg 120 (pt 38/56)
Character Range: 258953–261819

out on vehicles which have been run-in a maximum of 15,000 km.

         In this case, the running-in procedure will be conducted by the manufacturer who shall undertake not to make any adjustments to those vehicles.

        9.3.1.1.2.2. If the manufacturer asks to conduct a running-in procedure ('x' km, where x ≤ 15,000 km), it may be carried out as follows:

         The emissions of CO2 will be measured at zero and at 'x' km on the first tested vehicle (which can be the type approval vehicle);

         The evolution coefficient (EC) of the emissions between zero and 'x' km will be calculated as follows:

         The value of EC may be less than 1.

         The following vehicles will not be subjected to the running-in procedure, but their zero km emissions will be modified by the evolution coefficient, EC.

         In this case, the values to be taken will be:

         The value at 'x' km for the first vehicle;

         The values at zero km multiplied by the evolution coefficient for the following vehicles.

        9.3.1.1.2.3. As an alternative to this procedure, the car manufacturer can use a fixed evolution coefficient, EC, of 0.92 and multiply all values of CO2 measured at zero km by this factor.

        9.3.1.1.2.4. The reference fuels described in Annexes 10 and 10a of Regulation No. 83 shall be used for this test.

        9.3.2. Conformity of production when manufacturer's statistical data is available.

        9.3.2.1. The following sections describe the procedure to be used to verify the CO2 conformity of production requirements when the manufacturer's production standard deviation is satisfactory.

        9.3.2.2. With a minimum sample size of three the sampling procedure is set so that the probability of a lot passing a test with 40 per cent of the production defective is 0.95 (producer's risk = 5 per cent) while the probability of a lot being accepted with 65 per cent of the production defective is 0.1 (consumer's risk = 10 per cent).

        9.3.2.3. The following procedure is used (see figure 1):

         Let L be the natural logarithm of the CO2 type approval value:

         xI = the natural logarithm of the measurement for the i-th vehicle of the sample;

         s = an estimate of the production standard deviation (after taking the natural logarithm of the measurements);

         n = the current sample number.

        9.3.2.4. Compute for the sample, the test statistic quantifying the sum of the standardized deviations to the limit and defined as:

        9.3.2.5. Then:

        9.3.2.5.1. if the test statistic is greater than the pass decision number for the sample given in table 1, a pass decision is reached;

        9.3.2.5.2. if the test statistic is less than the fail decision number for the sample size given in table 1, a fail decision is reached;

        9.3.2.5.3.