scope:

This part of ISO 23274 specifies a chassis dynamometer test procedure to measure the exhaust emissions and the electric energy and fuel consumption for the vehicles. This standard applies to vehicles with the following characteristics: - the vehicle is classified as passenger cars or light duty trucks, as defined in each regional annex; - the nominal energy of the RESS is at least 2 % of the total energy consumption over an applicable driving test (ADT); - ICE only using liquid fuels (for example, gasoline and diesel fuel). NOTE In case of the vehicles with ICE using other fuel (for example,. CNG, LPG, H2), this part of ISO 23274 can apply except the measurement of consumed fuel, otherwise the measurement method for those using the corresponding fuel can apply. This part of ISO 23274 proposes procedures of correcting the measured emissions and fuel consumption of HEV, in order to obtain the values when the battery state of charge (SOC) of RESS does not remain the same between the beginning and the end of ADT. The standard can also be applied to measurement procedures for exhaust emissions and fuel consumption of externally chargeable HEVs when a vehicle is not externally charged and operated only in the charge sustaining (CS) state, as described in Part 2. NOTE For CS state, see ISO 23274-2.