ISO INTERNATIONAL STANDARD 16552 First edition 2014-07-15 Heavy commercial vehicles and buses - Stopping distance in straight- line braking with ABS Open loop and closed loop test methods Vehicules utilitaires lourds -Distance d'arret de freinage en ligne droite avec ABS - Méthodes d'essai en boucle ouverte et boucle fermée Reference number IS0 16552:2014(E) LSO @ IS0 2014 Not for Resale IS0 16552:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 All rights reserved. Unless otherwise specified, 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 16552:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 4 Principle ..2 5 Variables .2 5.1 Reference system .2 5.2 Variables to be measured ..3 6 Measuring equipment. .3 7 Test conditions ..4 7.1 General. .4 7.2 Test track. .4 7.3 Ambient conditions .4 7.4 Test vehicle ..4 8 Test method .5 8.1 General. .5 8.2 Performance of the braking procedure. .5 9 Data evaluation and presentation of results. .6 9.1 General .6 9.2 Stopping distance .1 9.3 Deceleration at full braking (optional) 7 9.4 Braking distance (optional) .8 9.5 Build-updistance(optional) .8 9.6 Lateral deviation, Y1 (optional, for open-loop tests) .8 9.7 Yaw angle deviation, (optional, for open-loop tests) .8 9.8 Steering-wheel angle, Sh (optional, for closed-loop test) .9 Annex A (normative) Test report - General data and test conditions ..10 Annex B (informative) Test report Results .11 Annex C (informative) Brake burnishing and calibrations .14 Annex D (informative) Principlegraphs .15 iii Stal ense with ISt thout license from IHS Not for Resale