What is ISO 23274‑2 about ?
ISO 23274‑2 is part two of the multi-series standard that specifies a chassis dynamometer test procedure to determine the end of the charge-depleting 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.
ISO 23274‑2 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 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
- The nominal energy of the RESS is at least 2 % of the total energy of consumed fuel over an ADT
Note: Final determination of exhaust emissions and fuel consumption is not included in ISO 23274‑2.
Who is ISO 23274‑2 for ?
ISO 23274‑2 on exhaust emissions and fuel consumption measurements for externally chargeable vehicles is applicable to:
- Hybrid-electric road vehicle manufacturers
- Hybrid-electric road vehicle battery manufacturers
- Hybrid-electric road vehicle charger manufacturers
- Hybrid-electric road vehicle testing facilities
- Automotive engineers
Why should you use ISO 23274‑2 ?
The end of the charge depleting state is an important step for procedures to determine exhaust emissions and fuel consumption measurements.
ISO 23274‑2 specifies how to determine the end of the charge depleting state and the consumed electric energy during the charge depleting state. In ISO 23274‑2, applicable driving tests during the charge-sustaining state are used to determine the end of the CD state.
ISO 23274‑2 provides chassis dynamometer test conditions, test procedures and instruments to be used. This will help you in conducting the chassis dynamometer test.
What’s changed since the last update ?
BS ISO 23274‑2:2021 is the second edition that replaces the first edition (ISO 23274‑2:2012), which has been technically revised.
The main changes compared to the previous edition are as follows:
- Deletion of former Annexes A, B and C (regional tests) because their information is obsolete
- Harmonization of terms and definitions with ISO/TR 8713 and ISO 23274‑1
