BS ISO BRITISH STANDARD 16234:2006 Heavy commercial yehicles and buses - Straight-ahead braking on surfaces with split coefficient of friction - Open-loop test method ICS 43.080.01 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO16234:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO16234:2006. The UK participation in its preparation was entrusted to Technical Committee AUE/15, Safety related to vehicles. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliancewith a British Standard cannot confer immunityfrom legal obligations. This British Standard was Amendmentsissuedsincepublication published underthe authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on29June2007 BSI 2007 ISBN9780580529115 BS ISO 16234:2006 ISO INTERNATIONAL STANDARD 16234 First edition 2006-12-01 Heavy commercial vehicles and buses Straight-ahead braking on surfaces with split coefficient of friction - Open-loop test method Vehicules utilitaires lourds- Freinage en ligne droite sur surfaces a adherencemixte-Methoded'essai enboucleouverte Reference number ISO 16234:2006(E) ISO ii BSISO16234:2006 Contents Page Foreword iv Introduction 1 Scope 2 Normative references.. 3 Terms,definitionsandsymbols. 3.1 Terms and definitions.. 3.2 Symbols... 4 Principle 5 Measuring equipment... 6 Variables 7 Testconditions 7.1 General..... 7.2 Testtrack 7.3 Test vehicle. 8 Test method. 8.1 Conditionandtemperatureofthebrakes 8.2 Initial driving conditions ..... 8.3 Performanceofthebrakingprocedure 8.4 Time references. 9 Data evaluation... 9.1 9.2 Validity criteria 9.3 Time history.. 9.4 Characteristic values. 9.5 Furtheradditionalevaluation AnnexA(normative)Test reportGeneral data andtest conditions. AnnexB(normative)TestreportPresentationofresults Bibliography ... ili BS IS0 16234:2006 Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison_with isO, also take part in the work. iso collaborates closely with the InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 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. ISO16234waspreparedbyTechnicalCommitteeISO/TC22,Roadvehicles,SubcommitteeSC9,Vehicle dynamicsandroad-holdingability. iv BSIS016234:2006 Introduction task of evaluating the dynamic behaviour is therefore very difficult, since significant interactions of these driver-vehicle-road elements are each complex in themselves. A description of the behaviour of the road vehicle must inevitably involve information obtained from a number of tests of different types. Since this test method quantifies only a small part of the complete handling characteristics, the results of this test can only be considered significant for a correspondingly small part of the overall dynamic behaviour. Moreover,sufficientknowledgeis notavailabletocorrelateoverall vehicle dynamicpropertieswithaccident between accident prevention and vehicle dynamic properties in general, and the results of this test in particular. Therefore, it is not possible to use this method and test results for regulation purposes.