ISO INTERNATIONAL STANDARD 8855 Second edition 2011-12-15 Road vehicles Vehicle dynamics and road-holding ability - Vocabulary Vehicules routiers - Dynamique des véhicules et tenue de route Vocabulaire Reference number ISO 8855:2011(E) @ ISO 2011 ISO 8855:2011(E) COPYRIGHTPROTECTED DOCUMENT @ISO2011 The reproduction of the terms and definitions contained in this International Standard is permitted in teaching manuals, instruction booklets, technical publications and journals for strictly educational or implementation purposes. The conditions for such reproduction are: offered for sale; and that this International Standard is referenced as the source document. With the sole exceptions noted above, no other part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing 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 copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2011 - All rights reserved ISO 8855:2011(E) Contents Page Foreword . ..iv Introduction 1 Scope. 2 Axissystem 3 Vehicle unit Vehicle geometry and masses 5 Vehicle motion variables ... 5.1 Linearmotionvariables 5.2 Angular motion variables . 5.3 Terms relating to vehicle trajectory measures.... 14 6 Forces and moments 15 6.1 Forces.. 15 6.2 Moments 16 7 Suspension and steering geometry 16 7.1 Steer and camber angles. 16 7.2 Steering-axis geometry. 20 8 Kinematics and compliances. 8.1 Kinematics.. 23 8.2 Compliances 25 9 Ride and roll stiffness. 25 10 Tyres... 26 10.1 Tyre geometry... 26 10.2 Tyreforcesandmoments 27 10.3 Terms relating to tyre measures 28 11 Input types and control modes .30 11.1 Inputtypes 30 11.2 Control modes . 12 Responses ... 31 12.1 General response types 31 12.2 Equilibrium and stability. .31 12.3 Lateral response measures 32 12.4 Understeer and oversteer measures 33 Annex A (informative) Comments on terms and definitions 37 Bibliography 39 Alphabetical index. A!lr'ghtsreserved ii