ISO 6518-2

FINAL DRAFT
International
Standard
ISO/FDIS 6518-2
ISO/TC 22/SC 32
Road vehicles — Ignition systems —
Secretariat: JISC
Part 2:
Voting begins on:
2024-05-08
Electrical performance and function
test methods
Voting terminates on:
2024-07-03
Véhicules routiers — Systèmes d'allumage —
Partie 2: Performances électriques et méthodes d'essai de
fonctionnement
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MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 6518-2:2024(en) © ISO 2024

FINAL DRAFT
ISO/FDIS 6518-2:2024(en)
International
Standard
ISO/FDIS 6518-2
ISO/TC 22/SC 32
Road vehicles — Ignition systems —
Secretariat: JISC
Part 2:
Voting begins on:
Electrical performance and function
test methods
Voting terminates on:
Véhicules routiers — Systèmes d'allumage —
Partie 2: Performances électriques et méthodes d'essai de
fonctionnement
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.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ISO/FDIS 6518-2:2024(en) © ISO 2024

ii
ISO/FDIS 6518-2:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Ignition system description . 1
5 System load . 2
6 Ignition parameter measurements . . 2
6.1 Available secondary (spark) voltage .2
6.2 Secondary output voltage (open circuit coil secondary voltage).3
6.3 Minimum available voltage (loaded secondary voltage) .3
6.4 Secondary voltage at primary current switch on (feed forward voltage).4
6.5 Zener discharge current (peak spark current) .5
6.6 Zener discharge duration .6
6.7 Zener discharge voltage .6
6.8 Zener discharge energy .7
6.9 Primary current (peak coil current) .8
6.10 Average current input .9
6.11 Primary energy .9
6.12 Coil secondary voltage risetime .10
6.13 Peak coil primary voltage .10
6.14 Spark timing delay (time lag/delay time) .11
6.15 Dwell time or dwell angle . 12
7 Test equipment .13
7.1 Voltage probe (voltage divider) . 13
7.2 Oscilloscope . 13
7.3 Current probe . 13
7.4 DC source .14
7.5 Signal generator (arbitrary waveform generator) .14
7.6 Secondary loading .14
7.7 Test bench setup .14
8 Test procedures for ignition system parameter measurements .15
8.1 General comments . 15
8.2 Secondary voltage measurements . 15
8.3 Secondary spark energy measurements .16
8.4 Miscellaneous measurements .17
9 Test procedures for ignition system parameter measurements . 19

iii
ISO/FDIS 6518-2:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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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 32,
Electrical and electronic components and general system aspects.
This second edition cancels and replaces the first edition (ISO 6518-2:1995), which has been technically
revised.
The main changes compared are as follows:
— test description amended to reflect the state of the art in digital technology.
A list of all parts in the ISO 6518 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/FDIS 6518-2:2024(en)
Introduction
The purpose of this document is to provide a compact and concise specification on ignition parameter
measurements, the test equipment and the corresponding measurement procedures.
It is intended to specify equipment, conditions and methods to evaluate ignition systems for internal
combustion engines.
ISO 6518-1 specifies the definitions.

v
FINAL DRAFT International Standard ISO/FDIS 6518-2:2024(en)
Road vehicles — Ignition systems —
Part 2:
Electrical performance and function test methods
1 Scope
This document specifies the design and/or evaluation with the specific equipment, conditions and methods
for distributorless battery ignition systems intended for use in various internal combustion engines
including automotive, marine, motorcycle and utility engine applications. The test procedures listed in this
document are limited to measurements performed on a test bench only and do not include measurements
made directly on engines or vehicles. This document is not intended to supply information for battery
ignition systems used in aircraft applications of any type.
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 6518-1, Road vehicles — Ignition systems — Part 1: Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6518-1 apply.
ISO and IEC maintain terminology 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/
4 Ignition system description
This document applies to single ended coil on plug (COP)
...