Document ID: chunk:federal_register_of_legislation:F2022C00213:front:0:p22
Version: federal_register_of_legislation:F2022C00213
Segment Type: other
Provision Reference: 
Character Range: 61206–65938

be used to verify the CO2 conformity of production requirements when the manufacturer's evidence of production standard deviation is either unsatisfactory or unavailable.

        9.3.3.2. 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).

        9.3.3.3. The measurement of CO2 is considered to be log normally distributed and should first be transformed by taking the natural logarithms.  Let mo and m denote the minimum and maximum sample sizes respectively (mo = 3 and m = 32) and let n denote the current sample number.

        9.3.3.4. If the natural logarithms of the measurements in the series are x1, x2, ..., xj and L is the natural logarithm of the CO2 type approval value, then define:

        9.3.3.5. Table 2 shows values of the pass (An) and fail (Bn) decision numbers against current sample number.  The test statistic is the ratio  and shall be used to determine whether the series has passed or failed as follows:

         for mo  n  m:

        9.3.3.5.1. pass the series if ;

        9.3.3.5.2. fail the series if ;

        9.3.3.5.3. take another measurement if .

        Table 2

Sample Size                                     Pass Decision No.          Fail Decision No.
(cumulative number of vehicles tested)          An                         Bn
n

        (a)                                     (b)                        (c)

        3                                       - 0.80380                  16.64743
        4                                       - 0.76339                  7.68627
        5                                       - 0.72982                  4.67136
        6                                       - 0.69962                  3.25573
        7                                       - 0.67129                  2.45431
        8                                       - 0.64406                  1.94369
        9                                       - 0.61750                  1.59105
        10                                      - 0.59135                  1.33295
        11                                      - 0.56542                  1.13566
        12                                      - 0.53960                  0.97970
        13                                      - 0.51379                  0.85307
        14                                      - 0.48791                  0.74801
        15                                      - 0.46191                  0.65928
        16                                      - 0.43573                  0.58321
        17                                      - 0.40933                  0.51718
        18                                      - 0.38266                  0.45922
        19                                      - 0.35570                  0.40788
        20                                      - 0.32840                  0.36203
        21                                      - 0.30072                  0.32078
        22                                      - 0.27263                  0.28343
        23                                      - 0.24410                  0.24943
        24                                      - 0.21509                  0.21831
        25                                      - 0.18557                  0.18970
        26                                      - 0.15550                  0.16328
        27                                      - 0.12483                  0.13880
        28                                      - 0.09354                  0.11603
        29                                      - 0.06159                  0.09480
        30                                      - 0.02892                  0.07493
        31                                        0.00449                  0.05629
        32                                        0.03876                  0.03876

        9.3.3.6. Remarks

         The following recursive formulae are useful for computing successive values of the test statistic:

        9.4. Vehicles powered by an electric power train only:

         As a general rule, measures to ensure the conformity of production with regard to electric energy consumption is checked on the basis of the description in the type approval certificate set out in Annex 4 to this Regulation.

        9.4.1. The holder of the approval shall, in particular:

        9.4.1.1. Ensure the existence of procedures for the effective control of