ISO INTERNATIONAL STANDARD 21750 First edition 2006-03-15 Road vehicles Safety enhancement in conjunction with tyre inflation pressure monitoring Vehicules routiers Renforcement de la sécurité conjointement avec le controle de la pression de gonflage des pneumatiques Reference number ISO 21750:2006(E) @ ISO 2006 ISO 21750:2006(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation ?ISO2006 All rights reserved. Unless otherwise specified, no 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 [email protected] Web www.iso.org Published in Switzerland ISO 2006-All rights reserved ISO21750:2006(E) Contents Page Foreword. iv Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and abbreviations .. 5 Technicalrequirementsandtestproceduresforsystem. 5.1 General..... 5.2 Tyre Pressure Alerting System (TPAS) 5.3 Tyre Pressure Warning System (TPWS) 5.4 Tyre Leak Alerting System (TLAS).... 6 Technical requirements and test procedures of system components 10 6.1 General. 10 6.2 Wheel Fitted Component (WFC) 11 6.3 External car body Fitted Components (EFCs). 15 6.4 Internal car body Fitted Components (IFCs).... 15 7 Human Machine Interface (HMI) .... 15 7.1 Identification of controls, tell-tales and optical indicators 15 7.2 Information to the driver ... 16 7.3 Owner's manual information ... 16 7.4 Compatibility with extended mobility system 17 8 Recommended inflation pressure limits 17 Bibliography.. 'ghts reserved ili ISO 21750:2006(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 21750 was prepared by Technical Committee ISO/TC 22, Road vehicles. @ ISo 2006 - All rights reserved ISO21750:2006(E) Introduction A pneumatic tyre is a flexible component which is deflected when loaded. A tyre needs to be sufficiently inflated in order to be used at a limited deflection adapted to carry the wheel load as part of an axle load at a given speed and to transmit the expected longitudinal and transversal forces. The deflection is at the origin of In real driving conditions, the physical parameter that most correlates to the tyre deflection is the tyre inflation pressure. Therefore, the inflation pressure surveillance of pneumatic tyres for road vehicles has