ISO 6518-2:2024
(Main)Road vehicles — Ignition systems — Part 2: Electrical performance and function test methods
Road vehicles — Ignition systems — Part 2: Electrical performance and function test methods
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.
Véhicules routiers — Systèmes d'allumage — Partie 2: Performances électriques et méthodes d'essai de fonctionnement
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Standards Content (Sample)
International
Standard
ISO 6518-2
Third edition
Road vehicles — Ignition systems —
2024-08
Part 2:
Electrical performance and function
test methods
Véhicules routiers — Systèmes d'allumage —
Partie 2: Performances électriques et méthodes d'essai de
fonctionnement
Reference number
© ISO 2024
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ii
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 .16
8.3 Secondary spark energy measurements .17
8.4 Miscellaneous measurements .18
9 Test procedures for ignition system parameter measurements . 19
iii
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
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constitute an endorsement.
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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 third edition cancels and replaces the second edition (ISO 6518-2:1995), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 6518-2:1995/Cor. 1:1997.
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
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
International Standard ISO 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) and coil near plug (CNP). This document does not
propose methods to measure any advanced ignition technologies. Those advanced technologies may require
advanced methodologies for collection of performance characteristics.
The ignition system as defined for the tests tabulated in this document shall consist of:
a) A coil. This can be the conventional induction coil or an air or magnetic core transformer.
b) High voltage, metal conductor ignition cables which are specified to eliminate the varying effects of the
different kinds of cable with high impedance conductors. Resistance per foot, as well as inductance of
spark plug cables built to suppress radiation, can be quite different from manufacturer to manufacturer.
NOTE It is possible that some ignition systems do not function properly with metallic secondary cables due
to EMI and can require low resistance inductance cables.
c) The standard switching device used in modern systems is the insulated gate bipolar transistor (IGBT).
Other transistorized switches can be utilized too.
The preceding devices shall be interconnected as the manufacturer recommends or similar to the
conventional system see Figure 15 in 7.7.
5 System load
For the purposes of this document, the assumed loads for the ignition coil are capacitance, resi
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