ISO/FDIS 23274-2

Hybrid-electric road vehicles -- Exhaust emissions and fuel consumption measurements

Véhicules routiers électriques hybrides -- Mesurages des émissions à l'échappement et de la consommation de carburant

General Information

• Status: Published
• ICS: 43.120 - Electric road vehicles
• Technical Committee: ISO/TC 22/SC 37 - Electrically propelled vehicles
• Drafting Committee: ISO/TC 22/SC 37/WG 2 - Performance and energy consumption
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 09-Jun-2021
• Completion Date: 09-Jun-2021

RELATIONS

• Revised: ISO 23274-2:2012 - Hybrid-electric road vehicles -- Exhaust emissions and fuel consumption measurements
• Effective Date: 23-Apr-2020

Standards Content (sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23274-2
ISO/TC 22/SC 37
Hybrid-electric road vehicles —
Secretariat: DIN
Exhaust emissions and fuel
Voting begins on:
2021-06-09 consumption measurements —
Voting terminates on:
Part 2:
2021-08-04
Externally chargeable vehicles
Véhicules routiers électriques hybrides — Mesurages des émissions à
l'échappement et de la consommation de carburant —
Partie 2: Véhicules rechargeables par des moyens externes
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 23274-2:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
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ISO/FDIS 23274-2:2021(E)
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© ISO 2021

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ii © ISO 2021 – All rights reserved
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ISO/FDIS 23274-2:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 3

5 Test conditions and instrumentation ............................................................................................................................................. 3

5.1 Test conditions ........................................................................................................................................................................................ 3

5.2 Test instrumentation ......................................................................................................................................................................... 3

5.3 Charging of the RESS .......................................................................................................................................................................... 4

5.3.1 Application of a normal charge ........................................................................................................................... 4

5.3.2 Charging the RESS and measuring energy ................................................................................................ 4

6 Test procedure ........................................................................................................................................................................................................ 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Test sequence ........................................................................................................................................................................................... 5

6.2.1 General...................................................................................................................................................................................... 5

6.2.2 Vehicle preconditioning ............................................................................................................................................. 5

6.2.3 Vehicle soak .......................................................................................................................................................................... 5

6.2.4 Vehicle movement to the test room ................................................................................................................. 5

6.2.5 Measurement in each ADT ...................................................................................................................................... 5

6.2.6 Electric energy measurement ............................................................................................................................... 5

6.3 Determination of the end of the CD state and the beginning of the CS state ..................................... 6

6.3.1 General...................................................................................................................................................................................... 6

6.3.2 Determination of the end of the CD state (case 1) .............................................................................. 6

6.3.3 Determination of the end of the CD state (case 2) .............................................................................. 7

7 Additional data evaluation of results .............................................................................................................................................. 9

Annex A (informative) Procedure for determining the beginning of the CS state ..............................................10

© ISO 2021 – All rights reserved iii
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ISO/FDIS 23274-2:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,

Electrically propelled vehicles.

This second edition cancels and 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.
A list of all parts in the ISO 23274 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 23274-2:2021(E)
Hybrid-electric road vehicles — Exhaust emissions and
fuel consumption measurements —
Part 2:
Externally chargeable vehicles
1 Scope

This document 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. 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 (H )], 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

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/TR 8713, Electrically propelled road vehicles — Vocabulary

ISO 23274-1, Hybrid-electric road vehicles — Exhaust emissions and fuel consumption measurements —

Part 1: Non-externally chargeable vehicles
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ISO/FDIS 23274-2:2021(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/TR 8713 and the following

apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ADT
applicable driving test
single driving test schedule which is specified for a relevant region

Note 1 to entry: Chassis dynamometer test schedule for a relevant region is the Worldwide Light-duty Test Cycle

(WLTC) or the Urban Dynamometer Driving Schedule (UDDS), for example.
3.2
CD state
charge-depleting state

operating mode of a hybrid-electric vehicle (3.5) with ICE in which the vehicle runs by consuming the

stored electric energy in the rechargeable energy storage system (RESS) (3.7) from an external electric

power source or along with the fuel energy simultaneously or sequentially until charge-sustaining state

(3.3)
3.3
CS state
charge-sustaining state

operating mode where the hybrid-electric vehicle (3.5) runs by consuming the fuel energy while

sustaining the electric energy of the rechargeable energy storage system (RESS) (3.7)

3.4
energy balance of RESS
RESS
change of RESS (3.7) energy state during an applicable driving test (ADT) (3.1)
Note 1 to entry: Normally expressed in watt hours (Wh).

Note 2 to entry: For practical use, the energy balance of the RESS is approximated by multiplying the charge

balance of the RESS in ampere hours (Ah) with the nominal voltage of the RESS in volts (V).

3.5
HEV
hybrid-electric vehicle

vehicle with both a rechargeable energy storage system (RESS) (3.7) and a fuelled power source for

propulsion

EXAMPLE Internal combustion engine or fuel cell systems are typical types of fuelled power sources.

3.6
rated capacity

supplier's specification of the total number of ampere hours that can be withdrawn from a fully charged

battery pack or system for a specified set of test conditions such as discharge rate, temperature and

discharge cut-off voltage
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ISO/FDIS 23274-2:2021(E)
3.7
RESS
rechargeable energy storage system

rechargeable system that stores energy for the delivery of electric energy for the electric drive

EXAMPLE Batteries or capacitors.
3.8
regenerative braking

braking with conversion of kinetic energy into electric energy for charging the rechargeable energy

storage system (RESS) (3.7)
3.9
SOC
state of charge

available capacity of a rechargeable energy storage system (RESS) (3.7) or RESS subsystem expressed as

a percentage of rated capacity (3.6)
4 Symbols and abbreviated terms
CD charge-depleting
CNG compressed natural gas
CS charge-sustaining
E energy
E energy of consumed fuel
H hydrogen
ICE internal combustion engine
UDDS Urban Dynamometer Driving Schedule
WLTC Worldwide Light-duty Test Cycle
5 Test conditions and instrumentation
5.1 Test conditions
The test conditions in ISO 23274-1 shall apply.
5.2 Test instrumentation

The test instrumentation shall have the accuracy levels given in Table 1, unless otherwise specified by

the relevant regional ADT standard.
Table 1 — Accuracy of measured values
Item Unit Accuracy
Time s ± 0,1 s
Distance m ± 0,1 %
Temperature °C ± 1 °C
Accuracy for measured value: ± 0,3 % full scale deflection or ± 1 % of reading,
whichever is greater.
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