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RS ISO 23274-2: 2021
Hybrid-electric road vehicles — Exhaust emissions and fuel consumption measurements — Part 2: Externally chargeable vehicles

Abstract

This document specifies a chassis dynamometer test procedure to determine the end of the chargedepleting state (CD) and consumed electric energy during CD state.
The identification of the end of the CD state is an important step for procedures to determine exhaust
emissions and fuel consumption. Final determination of exhaust emissions and fuel consumption is not
included in this document.
This document applies to vehicles with the following characteristics.
— The vehicles are hybrid-electric road vehicles (HEV) with an internal combustion engine (ICE) and
an on-board rechargeable energy storage system (RESS) for vehicle propulsion which is supplied
with electric energy from an external electric power source.
— A CD state, in which the electric energy in the RESS from an external electric power source is
consumed, is followed by a charge-sustaining (CS) state in which the fuel energy is consumed
sustaining the electric energy of the RESS.
— Only batteries are assumed as the RESS of a vehicle.
— The RESS is not charged while driving unless by regenerative braking and/or by generative operation
driven via the ICE.
— External charge for the purpose of conditioning of the RESS is not included.
NOTE 1 Trolleybuses and solar powered vehicles are not included in the scope.
— The vehicle is classified as a passenger car or light duty truck, as defined in the relevant regional
applicable driving test (ADT) standard.
— For the ICE, only liquid fuels (for example, gasoline and diesel fuel) are used.
NOTE 2 In the case of vehicles with ICE using other fuel [for example, compressed natural gas (CNG),
hydrogen (H2)], this document can apply except the measurement of consumed fuel; otherwise the
measurement method for those using the corresponding fuel can apply.
— The nominal energy of the RESS is at least 2 % of the total energy of consumed fuel over an ADT

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 23274-2: 2021	ADOPTED ISO STANDARDS	Road vehicles engineering	21	Second Edition	Available