Division 4.5.1 Interpolation range for NOVC-HEVs and OVC-HEVs

F1The interpolation method shall only be used if the difference in charge-sustaining CO₂ mass emission, M_CO2,CS, according to Table A8/5, step no. 8 between test vehicles L and H is between a minimum of 5 g/km and a maximum of 20 per cent plus 5 g/km of the charge-sustaining CO₂ mass emission, M_CO2,CS, according to Table A8/5, step no. 8 for vehicle H, but at least 15 g/km and not exceeding 20 g/km.

At the request of the manufacturer and with approval of the approval authority, the application of the interpolation method on individual vehicle values within a family may be extended if the maximum extrapolation is not more than 3 g/km above the charge-sustaining CO₂ mass emission of vehicle H and/or is not more than 3 g/km below the charge-sustaining CO₂ mass emission of vehicle L. This extension is valid only within the absolute boundaries of the interpolation range specified in this paragraph.

The maximum absolute boundary of 20 g/km charge-sustaining CO₂ mass emission difference between vehicle L and vehicle H or 20 per cent of the charge-sustaining CO₂ mass emission for vehicle H, whichever is smaller, may be extended by 10 g/km if a vehicle M is tested. Vehicle M is a vehicle within the interpolation family with a cycle energy demand within ± 10 per cent of the arithmetic average of vehicles L and H.

The linearity of charge-sustaining CO₂ mass emission for vehicle M shall be verified against the linear interpolated charge-sustaining CO₂ mass emission between vehicle L and H.

The linearity criterion for vehicle M shall be considered fulfilled if the difference between the charge-sustaining CO₂ mass emission of vehicle M derived from the measurement and the interpolated charge-sustaining CO₂ mass emission between vehicle L and H is below 1 g/km. If this difference is greater, the linearity criterion shall be considered to be fulfilled if this difference is 3 g/km or 3 per cent of the interpolated charge-sustaining CO₂ mass emission for vehicle M, whichever is smaller.

If the linearity criterion is fulfilled, the interpolation method shall be applicable for all individual vehicles between vehicles L and H within the interpolation family.

If the linearity criterion is not fulfilled, the interpolation family shall be split into two sub-families for vehicles with a cycle energy demand between vehicles L and M, and vehicles with a cycle energy demand between vehicles M and H.

For vehicles with a cycle energy demand between that of vehicles L and M, each parameter of vehicle H necessary for the application of the interpolation method on individual OVC-HEV and NOVC-HEV values, shall be substituted by the corresponding parameter of vehicle M.

For vehicles with a cycle energy demand between that of vehicles M and H, each parameter of vehicle L that is necessary for the application of the interpolation method on individual OVC-HEV and NOVC-HEV values shall be substituted by the corresponding parameter of vehicle M.