ISO 2534:2020
(Main)Road vehicles — Engine test code — Gross power
Road vehicles — Engine test code — Gross power
This document specifies a method for testing internal combustion engines for propulsion of road vehicles as defined in ISO 3833. It applies to the evaluation of their performance with a view, in particular, to presenting curves of power and specific fuel consumption at full load as a function of engine speed. This document is applicable to gross power assessment. This document concerns internal combustion engines used for propulsion of passenger cars, trucks and other motor vehicles, excluding motorcycles, mopeds and agricultural tractors normally travelling on roads, and included in one of the following categories: — reciprocating internal combustion engines (spark-ignition or compression-ignition) but excluding free piston engines; — rotary piston engines. These engines can be naturally aspirated or pressure charged, either using a mechanical supercharger or turbocharger. This document is primarily intended for the communication between the engine manufacturer and the manufacturer of the vehicle. If used for advertising purposes, the ratings will clearly state that they are gross power in accordance with 9.2.
Véhicules routiers — Code d'essai des moteurs — Puissance brute
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INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 2534
ISO/TC 22/SC 34
Road vehicles — Engine test code —
Secretariat: ANSI
Gross power
Voting begins on:
20200306
Véhicules routiers — Code d'essai des moteurs — Puissance brute
Voting terminates on:
20200501
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 2534:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
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©
NATIONAL REGULATIONS. ISO 2020
ISO/FDIS 2534:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
ISO/FDIS 2534:2020(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Accuracy of measuring equipment and instruments . 2
4.1 Torque . 2
4.2 Engine speed (rotational frequency) . 2
4.3 Fuel flow . 2
4.4 Fuel temperature. 2
4.5 Air temperature . 2
4.6 Barometric pressure . 2
4.7 Back pressure in exhaust system . 3
4.8 Depression in inlet system . 3
4.9 Absolute pressure in inlet duct . 3
5 Tests . 5
5.1 Auxiliaries . 5
5.1.1 Auxiliaries to be fitted . 5
5.1.2 Auxiliaries to be removed . 6
5.1.3 Compression-ignition engine starting auxiliaries . 6
5.2 Setting conditions . 6
5.3 Test conditions . 6
5.4 Test procedure . 8
5.5 Data to be recorded . 8
6 Power correction factors . 8
6.1 Definition of factor α for power correction . 8
6.2 Atmospheric conditions . 9
6.2.1 Reference atmospheric conditions . 9
6.2.2 Test atmospheric conditions . 9
6.3 Determination of power correction factors . 9
6.3.1 Naturally aspirated and pressure-charged spark-ignition engines — Factor α .10
a
6.3.2 Compression-ignition engines — Factor α . .10
c
6.3.3 Turbocharged engine with a system compensating the ambient conditions .12
6.3.4 Other types of engine .12
7 Measurement of and correction for smoke value for compression-ignition engines .12
7.1 Correction factor for light absorption coefficient of smoke .12
7.2 Determination of correction factor for light absorption coefficient of smoke .12
7.3 Limits of application.12
8 Test report .13
8.1 Compression-ignition engines — Essential characteristics .13
8.1.1 Description of engine .13
8.1.2 Cooling system .13
8.1.3 Temperatures specified by the manufacturer .14
8.1.4 Pressure charger (with/without) (delete where inapplicable) .14
8.1.5 Inlet system .15
8.1.6 Additional smoke control devices (if any, and if not covered by another
heading) . .15
8.1.7 Fuel feed system .15
8.1.8 Valve timing .16
8.1.9 Exhaust system .16
8.1.10 Lubrication system .16
8.1.11 Electrical equipment .17
8.1.12 Other engine-driven equipment .17
ISO/FDIS 2534:2020(E)
8.2 Spark-ignition engines — Essential characteristics .17
8.2.1 Description of engine .17
8.2.2 Cooling system .17
8.2.3 Temperature specified by the manufacturer .18
8.2.4 Pressure charger (with/without) (delete where inapplicable) .18
8.2.5 Inlet system .19
8.2.6 Additional anti-pollution devices (if any, and if not covered by another
heading) . .19
8.2.7 Fuel feed system .19
8.2.8 Valve timing .20
8.2.9 Ignition system .20
8.2.10 Exhaust system .21
8.2.11 Lubrication system .21
8.2.12 Electrical equipment .21
8.2.13 Other auxiliaries fitted to engine .21
8.3 Test conditions for measuring engine gross power .21
8.4 Statement of results as function of engine speed.24
9 Verification of engine performance .25
9.1 Designation .25
9.2 Notation .25
9.2.1 Declared gross power and corresponding engine speed (range) .25
9.2.2 Declared gross torque and corresponding engine speed (range) .25
9.2.3 Declared specific gross fuel consumption and corresponding engine
speed (range) .25
9.3 Tolerances – Declared values .25
...
INTERNATIONAL ISO
STANDARD 2534
Third edition
2020-05
Road vehicles — Engine test code —
Gross power
Véhicules routiers — Code d'essai des moteurs — Puissance brute
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Accuracy of measuring equipment and instruments . 2
4.1 Torque . 2
4.2 Engine speed (rotational frequency) . 2
4.3 Fuel flow . 2
4.4 Fuel temperature. 2
4.5 Air temperature . 2
4.6 Barometric pressure . 2
4.7 Back pressure in exhaust system . 3
4.8 Depression in inlet system . 3
4.9 Absolute pressure in inlet duct . 3
5 Tests . 5
5.1 Auxiliaries . 5
5.1.1 Auxiliaries to be fitted . 5
5.1.2 Auxiliaries to be removed . 6
5.1.3 Compression-ignition engine starting auxiliaries . 6
5.2 Setting conditions . 6
5.3 Test conditions . 6
5.4 Test procedure . 8
5.5 Data to be recorded . 8
6 Power correction factors . 8
6.1 Definition of factor α for power correction . 8
6.2 Atmospheric conditions . 9
6.2.1 Reference atmospheric conditions . 9
6.2.2 Test atmospheric conditions . 9
6.3 Determination of power correction factors . 9
6.3.1 Naturally aspirated and pressure-charged spark-ignition engines — Factor α .10
a
6.3.2 Compression-ignition engines — Factor α . .10
c
6.3.3 Turbocharged engine with a system compensating the ambient conditions .12
6.3.4 Other types of engine .12
7 Measurement of and correction for smoke value for compression-ignition engines .12
7.1 Correction factor for light absorption coefficient of smoke .12
7.2 Determination of correction factor for light absorption coefficient of smoke .12
7.3 Limits of application.12
8 Test report .13
8.1 Compression-ignition engines — Essential characteristics .13
8.1.1 Description of engine .13
8.1.2 Cooling system .13
8.1.3 Temperatures specified by the manufacturer .14
8.1.4 Pressure charger (with/without) (delete where inapplicable) .14
8.1.5 Inlet system .15
8.1.6 Additional smoke control devices (if any, and if not covered by another
heading) . .15
8.1.7 Fuel feed system .15
8.1.8 Valve timing .16
8.1.9 Exhaust system .16
8.1.10 Lubrication system .16
8.1.11 Electrical equipment .17
8.1.12 Other engine-driven equipment .17
8.2 Spark-ignition engines — Essential characteristics .17
8.2.1 Description of engine .17
8.2.2 Cooling system .17
8.2.3 Temperature specified by the manufacturer .18
8.2.4 Pressure charger (with/without) (delete where inapplicable) .18
8.2.5 Inlet system .19
8.2.6 Additional anti-pollution devices (if any, and if not covered by another
heading) . .19
8.2.7 Fuel feed system .19
8.2.8 Valve timing .20
8.2.9 Ignition system .20
8.2.10 Exhaust system .21
8.2.11 Lubrication system .21
8.2.12 Electrical equipment .21
8.2.13 Other auxiliaries fitted to engine .21
8.3 Test conditions for measuring engine gross power .21
8.4 Statement of results as function of engine speed.24
9 Verification of engine performance .25
9.1 Designation .25
9.2 Notation .25
9.2.1 Declared gross power and corresponding engine speed (range) .25
9.2.2 Declared gross torque and corresponding engine speed (range) .25
9.2.3 Declared specific gross fuel consumption and corresponding engine
speed (range) .25
9.3 Tolerances – Declared values .25
9.3.1 Power .25
9.3.2 Torque .26
9.3.3 Specific fuel consumption .26
9.3.4 Numerical tolerances .
...
INTERNATIONAL ISO
STANDARD 2534
Third edition
2020-05
Road vehicles — Engine test code —
Gross power
Véhicules routiers — Code d'essai des moteurs — Puissance brute
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Accuracy of measuring equipment and instruments . 2
4.1 Torque . 2
4.2 Engine speed (rotational frequency) . 2
4.3 Fuel flow . 2
4.4 Fuel temperature. 2
4.5 Air temperature . 2
4.6 Barometric pressure . 2
4.7 Back pressure in exhaust system . 3
4.8 Depression in inlet system . 3
4.9 Absolute pressure in inlet duct . 3
5 Tests . 5
5.1 Auxiliaries . 5
5.1.1 Auxiliaries to be fitted . 5
5.1.2 Auxiliaries to be removed . 6
5.1.3 Compression-ignition engine starting auxiliaries . 6
5.2 Setting conditions . 6
5.3 Test conditions . 6
5.4 Test procedure . 8
5.5 Data to be recorded . 8
6 Power correction factors . 8
6.1 Definition of factor α for power correction . 8
6.2 Atmospheric conditions . 9
6.2.1 Reference atmospheric conditions . 9
6.2.2 Test atmospheric conditions . 9
6.3 Determination of power correction factors . 9
6.3.1 Naturally aspirated and pressure-charged spark-ignition engines — Factor α .10
a
6.3.2 Compression-ignition engines — Factor α . .10
c
6.3.3 Turbocharged engine with a system compensating the ambient conditions .12
6.3.4 Other types of engine .12
7 Measurement of and correction for smoke value for compression-ignition engines .12
7.1 Correction factor for light absorption coefficient of smoke .12
7.2 Determination of correction factor for light absorption coefficient of smoke .12
7.3 Limits of application.12
8 Test report .13
8.1 Compression-ignition engines — Essential characteristics .13
8.1.1 Description of engine .13
8.1.2 Cooling system .13
8.1.3 Temperatures specified by the manufacturer .14
8.1.4 Pressure charger (with/without) (delete where inapplicable) .14
8.1.5 Inlet system .15
8.1.6 Additional smoke control devices (if any, and if not covered by another
heading) . .15
8.1.7 Fuel feed system .15
8.1.8 Valve timing .16
8.1.9 Exhaust system .16
8.1.10 Lubrication system .16
8.1.11 Electrical equipment .17
8.1.12 Other engine-driven equipment .17
8.2 Spark-ignition engines — Essential characteristics .17
8.2.1 Description of engine .17
8.2.2 Cooling system .17
8.2.3 Temperature specified by the manufacturer .18
8.2.4 Pressure charger (with/without) (delete where inapplicable) .18
8.2.5 Inlet system .19
8.2.6 Additional anti-pollution devices (if any, and if not covered by another
heading) . .19
8.2.7 Fuel feed system .19
8.2.8 Valve timing .20
8.2.9 Ignition system .20
8.2.10 Exhaust system .21
8.2.11 Lubrication system .21
8.2.12 Electrical equipment .21
8.2.13 Other auxiliaries fitted to engine .21
8.3 Test conditions for measuring engine gross power .21
8.4 Statement of results as function of engine speed.24
9 Verification of engine performance .25
9.1 Designation .25
9.2 Notation .25
9.2.1 Declared gross power and corresponding engine speed (range) .25
9.2.2 Declared gross torque and corresponding engine speed (range) .25
9.2.3 Declared specific gross fuel consumption and corresponding engine
speed (range) .25
9.3 Tolerances – Declared values .25
9.3.1 Power .25
9.3.2 Torque .26
9.3.3 Specific fuel consumption .26
9.3.4 Numerical tolerances .
...
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