ISO INTERNATIONAL STANDARD 10521-1 First edition 2006-10-01 Road vehicles Road load - Part 1: Determination under reference atmospheric conditions VéhiculesroutiersRésistancesurroute- Partie 1: Détermination dans les conditions atmospheriques de reference Reference number ISO 10521-1:2006(E) @ ISO 2006 ISO 10521-1:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but downloading this file, parties accept therein the respons bility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademarkof 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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ? 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 + 4122 749 0947 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2006 - All rights reserved ISO 10521-1:2006(E) Contents Page Foreword.. iv Introduction. 1 Scope. 2 Normative references .. : Terms anddefinitions 4 Required overall measurement accuracy 2 5 Road-load measurement on road.. 5.1 Requirements for road test.... 5.1.1 Atmospheric conditions for road test..... 5.1.2 Test road.... 5.2 Preparation for road test... 5.2.1 Vehicle preparation... 5.2.2 Installation of instruments 5.2.3 Vehicle preconditioning. 5.3 Measurement of total resistance by coastdown method , 5.3.1 Multi-segment method ..... 5.3.2 Average deceleration method .... 5.3.3 Direct regression method ... 10 5.4 Onboard-anemometer based coastdown method... 11 5.4.1 Selection of speed range for road-load curve determination .. 5.4.2 Data collection .... 5.4.3 Vehicle coastdown.. .12 5.4.4 Determination of coefficients 12 5.4.5 Determination of total resistance... 5.5 Measurement of running resistance by torquemeter method .13 5.5.1 Installation of torquemeter .... .13 5.5.2 Vehicle running and data sampling ..... 13 5.5.3 Calculation of mean speed and mean torque ..... 5.5.4 Running resistance curve determination .. .16 5.6 Correction to standard atmospheric conditions ... 16 5.6.1 Correction factors........... 16 5.6.2 Road-loadcurvecorrection. .17 6 Road-load measurement by wind tunnel/chassis dynamometer .19 6.1 Aerodynamic drag measurement in wind tunnel .... .19 6.1.1 Requirements for wind tunnel... .19 6.1.2 Testing procedure.... .19 6.1.3 Test result.... ..19 6.2 Rolling resistance determination with chassis dynamometer... 6.2.1 19 6.2.2 Testing procedure.. 6.2.3 Test results.. 21 6.3 Total-resistance calculation . 21 6.4 Total-resistance curve determination.... Annex A (informative) Examples of onboard-anemometer calibration procedure @ ISO 2006 - All rights reserved ili ISO 10521-1:2006(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 ar