Division 2.3.2 Determination of CO2 mass emission correction coefficient KCO2

For OVC-HEVs and NOVC-HEVs, the CO₂ mass emission correction coefficient K_CO2, determined by driving a set of charge-sustaining Type 1 tests, is defined by the following equation:

K_{CO2} = \frac{\sum_{n_{CS}}^{n = 1} (({EC}_{DC,CS,n} - {EC}_{DC,CS,avg}) \times (M_{CO2,CS,nb,n} - M_{CO2,CS,nb,avg}))}{\sum_{n_{CS}}^{n = 1} {({EC}_{DC,CS,n} - {EC}_{DC,CS,avg})}^{2}}

where:

K_CO2

is the CO₂ mass emission correction coefficient, (g/km)/(Wh/km);

EC_DC,CS,n

is the charge-sustaining electric energy consumption of test n based on the REESS depletion according to paragraph 2.3.1. of this Appendix, Wh/km;

EC_DC,CS,avg

is the arithmetic average of the charge-sustaining electric energy consumption of n_cs tests based on the REESS depletion according to paragraph 2.3.1. of this Appendix, Wh/km;

M_CO2,CS,nb,n

is the charge-sustaining CO₂ mass emission of test n, not corrected for the energy balance, calculated according Table A8/5, step no. 2, g/km;

M_{CO2,CS,nb,avg}

is the arithmetic average of the charge-sustaining CO₂ mass emission of n_cs tests based on the CO₂ mass emission, not corrected for the energy balance, according to the equation below, g/km;

is the index number of the considered test;

n_cs

is the total number of tests;

and:

M_{CO2,CS,nb,avg} = \frac{1}{n_{CS}} \times \sum_{n_{cs}}^{n = 1} M_{CO2,CS,nb,n}

The CO₂ mass emission correction coefficient shall be rounded to four significant figures. The statistical significance of the CO₂ mass emission correction coefficient shall be evaluated by the approval authority.