ISO/PAS PUBLICLY 5101 AVAILABLE SPECIFICATION First edition 2021-10 Road vehicles Field load specification for brake actuation and modulation systems Vehicules routiers-Specification de la charge pour les systemes d'actionnementet demodulationdesfreins Reference number IS0/PAS5101:2021(E) ISO @IS0 2021 IS0/PAS5101:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwisein anyform or by any means,electronic or mechanical, includingphotocopying,or postingon 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: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS0 2021-All rights reserved IS0/PAS5101:2021(E) Contents Page Foreword iv Introduction. .V 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions. .1 4 .2 General 5 Percentiles of field coverage .3 6 Base assumptions and boundary conditions 6.1 General 4 6.2 Lifetime specifications 4 6.2.1 Vehiclelifetime 4 6.2.2 Standstill events, slopes and durations 5 6.2.3 Standstill duration distribution 5 6.2.4 Brake duration distribution. 5 6.3 Number of brakeoperations 6 6.4 Temperature distributions 7 6.4.1 Global environmental temperature distribution Tenv 7 6.4.2 Temperature distribution at installation location Tinst 8 Exceptionalhightemperaturesattheinstallationlocation .9 6.4.3 6.4.4 Function specific occurrence and distributions over temperature ranges 10 6.5 Brakepedal applicationprofile 11 6.5.1Parametersforbrakepedalapplyandreleasetime 11 6.5.2 Modulation of deceleration duringbrakeevents 12 7 Braking system usage .13 7.1 Base brakefunction 13 7.2 Dynamic stabilityfunctions. 14 7.2.1 Electronic brake force distribution (EBD) 14 7.2.2 Antilock braking system (ABS) 14 7.2.3 Traction control (TCS) 16 7.2.4 Electronic stability control (ESC) 20 7.2.5 Trailer sway control (TSC) 24 7.2.6 Roll-overmitigationfunctions. 24 7.3 Brake torque optimizing functions. 25 7.3.1 Brakeboostersupportfunctions. 25 7.3.2 Hydraulic brake assist (HBA). .36 7.3.3 Hydraulic rear-brake boost (HRB) 37 7.3.4 Fading support 37 7.3.5 Brake preconditioning 38 7.4 Assistancefunctions 40 7.4.1 Standstill management. 40 7.4.2 Hill descent control. 45 7.4.3 Adaptive cruise control (ACC) 46 7.4.4 Parking assist (PA) 51 8 Substitution methods 55 8.1 Dependent functions 55 8.1.1 Substitution of ABS functions .55 8.1.2 Substitution of hold functions 56 8.1.3 Substitution of fading support manoeuvres 57 8.1.4 Substitution of brakediscwipingmanoeuvres 57 8.1.5 Substitutionofbasebrakefunctions 58 Bibliography 59 @IS0 2021 - All rights reserved ii