ISO INTERNATIONAL STANDARD 20574 First edition 2019-04 Road vehicles Durability test method for starter motor for stop and start system vehicules routiers - Méthodes de test d'endurance pour les déemarreur stop and start system Reference number IS020574:2019(E) so @ IS0 2019 IS0 20574:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 20574:2019(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normative references ..1 3 Terms, definitions, symbols and abbreviated terms. ..1 4 Planning of durability test ..4 4.1 Determination of durability test types. 4 4.2 Determination of durability test conditions .4 4.3 Definition of cranking time, overrunning time .7 5 Test bench equipment and information .9 5.1 Test bench structure. .9 5.2 Minimum requirements of test bench .9 5.3 Test bench measuring capabilities and channel list .9 5.4 Test stop criteria 10 6 Detailed test procedures .11 6.1 Test procedure. 11 6.1.1 General .11 6.1.2 Installation and setup stage for engine or engine simulator. .11 6.1.3 Pre-check stage .12 6.1.4 Test execution stage ..12 6.1.5 Post processing and reporting stage 13 7 Supplemental test methods .13 7.1 Brush temperature calibration 13 7.2 Starter motor input V-I curve and verification .15 7.3 Brush length measurement... .16 7.4 Pinion to ring gear axial gap... .. 17 Annex A (normative) Test bench structure (Type 1) ..18 Annex B (normative) Test bench structure (Type 2) ..19 Annex C (normative) Test bench structure (Type 3 and 4) .20 Annex D (informative) Summary of reporting items after the test .21 @ IS0 2019 - All rights reserved ii