Appendix 1 Verification of conformity of production for Type 1 test—statistical method

This Appendix describes the procedure to be used to verify the production conformity requirements for the Type 1 test for pollutants/CO ₂ , including conformity requirements for PEVs and OVC-HEVs, and to monitor the OBFCM device accuracy.

From the number of N tests: x_1, x_2, … x_N, the average X_tests and the variance VAR are to be determined from all N measurements:

and

1. (i)

   Pass the family if $X_{\mathrm{tests}}<A\times L-\mathrm{VAR}∕L$

2. (ii)

   Fail the family if $X_{\mathrm{tests}}>A\times L-\left(\left(N-3\right)∕13\right)\times \mathrm{VAR}∕L$

3. (iii)

   Take another measurement if:

   $A\times L-\mathrm{VAR}∕L\le X_{\mathrm{tests}}\le A\times L-\left(\left(N-3\right)∕13\right)\times \mathrm{VAR}∕L$

For the measurement of pollutants the factor A is set at 1,05 in order to take into account inaccuracies in the measurements.

In the case of CO₂ and EC the factor A is set at 1.01 and the value for L is set at 1. So in the case of CO₂ and EC the criteria are simplified to:

1. (i)

   Pass the family if $X_{\mathrm{tests}}<A-\mathrm{VAR}$

2. (ii)

   Fail the family if $X_{\mathrm{tests}}>A-\left(\left(N-3\right)∕13\right)\times \mathrm{VAR}$

3. (iii)

   Take another measurement if:

   $A-\mathrm{VAR}\le X_{\mathrm{tests}}\le A-\left(\left(N-3\right)∕13\right)\times \mathrm{VAR}$

F2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The Type Approval authority shall keep a record of the determined accuracies for each COP family tested.