Road vehicles — Durability test method of starter relay for stop and start system
This document defines the durability test methods of a starter relay for passenger vehicles (12 V) with a stop and start system. It uses a simulated electrical load to represent the starter solenoid.
Véhicules routiers — Méthodes de test d'endurance pour le relais démarreur stop and start system
Standards Content (Sample)
Road vehicles — Durability test
method of starter relay for stop and
Véhicules routiers — Méthodes de test d'endurance pour le relais
démarreur stop and start system
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1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Structure of starting circuit . 1
5 Types of starter solenoid . 2
6 Test methods . 2
6.1 Test method of the starter relay for the single-coil solenoid . 2
6.1.1 General. 2
6.1.2 Test circuit . 2
6.1.3 Test conditions. 3
6.2 Test method of the starter relay for the double-coil solenoid . 4
6.2.1 General. 4
6.2.2 Test circuit . 4
6.2.3 Test conditions. 4
6.3 Number of operation cycles and characteristics of the relay after the test . 8
Bibliography . 9
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A stop and start system requires more frequent engine starting therefore, the starter relay used in
such an engine should be durable. Currently, there is no common durability test method for starter
relays, and most individual durability test methods of vehicle manufacturers and relay suppliers use
actual starter solenoids as electrical loads of the relay. However, heat mass of the starter solenoid is
not sufficient, so cooling equipment and/or a longer test cycle time are necessary to prevent starter
This document provides a test method using a simulated electrical load which can shorten the test
period or eliminate cooling equipment.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22565:2019(E)
Road vehicles — Durability test method of starter relay for
stop and start system
This document defines the durability test methods of a starter relay for passenger vehicles (12 V) with
a stop and start system. It uses a simulated electrical load to represent the starter solenoid.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases fo