1、BSI Standards PublicationBS ISO 13674-2:2016Road vehicles Test methodfor the quantification of on-centre handlingPart 2: Transition testBS ISO 13674-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13674-2:2016.It supersedes BS ISO 13674-2:2006 which is w
2、ithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/15, Safety related to vehicles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contr
3、act. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 77347 1ICS 43.020Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
4、 of theStandards Policy and Strategy Committee on 30 April 2016.Amendments issued since publicationDate Text affectedBS ISO 13674-2:2016 ISO 2016Road vehicles Test method for the quantification of on-centre handling Part 2: Transition testVhicules routiers Mthode dessai pour la quantification du cen
5、trage Partie 2: Essai de la transitionINTERNATIONAL STANDARDISO13674-2Second edition2016-04-01Reference numberISO 13674-2:2016(E)BS ISO 13674-2:2016ISO 13674-2:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise s
6、pecified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below o
7、r ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 13674-2:2016ISO 13674-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13
8、 Terms, definitions and symbols 14 Principle 25 Variables .25.1 Reference system 25.2 Variables to be measured . 26 Measuring equipment . 36.1 Description . 36.2 Transducer installations . 36.3 Data processing 37 Test conditions . 37.1 General . 37.2 Test track 47.3 Wind velocity 47.4 Test vehicle .
9、 47.4.1 General data . 47.4.2 Tyres . 47.4.3 Operating components . 47.4.4 Loading conditions of the vehicle 58 Test procedure 58.1 Warm-up. 58.2 Initial driving condition 58.3 Transition test procedure 59 Data evaluation and presentation of results . 69.1 General . 69.2 Time histories 69.3 Characte
10、ristic values 69.3.1 Presentation of results 69.3.2 Steering-wheel torque versus steering-wheel angle (MHvs. H) . 99.3.3 Yaw velocity versus steering-wheel angle (d / dt vs. H) 99.3.4 Yaw velocity versus steering-wheel torque (d / dt vs. MH) . 99.3.5 Lateral acceleration versus steering-wheel angle
11、(ayvs. H) 99.3.6 Lateral acceleration versus steering-wheel torque (ayvs. MH) . 9Annex A (informative) Characteristic values 10Bibliography .15 ISO 2016 All rights reserved iiiContents PageBS ISO 13674-2:2016ISO 13674-2:2016(E)ForewordISO (the International Organization for Standardization) is a wor
12、ldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on
13、 that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this d
14、ocument and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Direc
15、tives, Part 2 (see www.iso.org/directives).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. Details of any patent rights identified during the develop
16、ment of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO spe
17、cific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles,
18、 Subcommittee SC 33, Vehicle dynamics and chassis components.This second edition cancels and replaces the first edition (ISO 13674-2:2006), which has been technically revised.ISO 13674 consists of the following parts, under the general title Road vehicles Test method for the quantification of on-cen
19、tre handling: Part 1: Weave test Part 2: Transition testiv ISO 2016 All rights reservedBS ISO 13674-2:2016ISO 13674-2:2016(E)IntroductionThe main purpose of this part of ISO 13674 is to provide repeatable and discriminatory test results.The dynamic behaviour of a road vehicle is a very important asp
20、ect of active vehicle safety. Any given vehicle, together with its driver and the prevailing environment, constitutes a closed-loop system that is unique. The task of evaluating the dynamic behaviour is therefore very difficult since the significant interaction of these driver-vehicle-environment el
21、ements are each complex in themselves. A complete and accurate description of the behaviour of the road vehicle must necessarily involve information obtained from a number of different tests.Since this test method quantifies only one small part of the complete vehicle handling characteristics, the r
22、esults of these tests can only be considered significant for a correspondingly small part of the overall dynamic behaviour.Moreover, insufficient knowledge is available concerning the relationship between overall vehicle dynamic properties and accident avoidance. A substantial amount of work is nece
23、ssary to acquire sufficient and reliable data on the correlation between accident avoidance and vehicle dynamic properties in general and the results of these tests in particular. Consequently, any application of this test method for regulation purposes will require proven correlation between test r
24、esults and accident statistics. ISO 2016 All rights reserved vBS ISO 13674-2:2016BS ISO 13674-2:2016Road vehicles Test method for the quantification of on-centre handling Part 2: Transition test1 ScopeThis part of ISO 13674 specifies a test schedule that addresses a particular aspect of the transiti
25、on test, the on-centre handling characteristics of a vehicle. It is applicable to passenger cars in accordance with ISO 3833 and to light trucks, N1 category.NOTE The manoeuvre specified in this test method is not representative of real driving conditions, but is useful for obtaining measures of veh
26、icle on-centre handling behaviour in response to a specific type of steering input under closely controlled test conditions. Other aspects of on-centre handling are addressed in the companion ISO 13674-1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced i
27、n this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1176, Road vehicles Masses Vocabulary and codesISO 2416, Passenger cars Mass d
28、istributionISO 3833, Road vehicles Types Terms and definitionsISO 8855, Road vehicles Vehicle dynamics and road-holding ability VocabularyISO 15037-1:2006, Road vehicles Vehicle dynamics test methods Part 1: General conditions for passenger cars3 Terms, definitions and symbolsFor the purposes of thi
29、s document, the terms, definitions and symbols given in ISO 1176, ISO 2416, ISO 3833, ISO 8855 and the following apply.3.1on-centre handlingdescription of the steering “feel” and steering precision of a vehicle during nominally straight-line driving and in negotiating large radius bends at high spee
30、ds but low lateral accelerations3.2ordinate thresholdvalue of a parameter plotted as the ordinate on a graph and defined as the minimum threshold of human perception3.3abscissa deadbandhorizontal separation between the pair of straight-line fits at ordinate threshold valuesINTERNATIONAL STANDARD ISO
31、 13674-2:2016(E) ISO 2016 All rights reserved 1BS ISO 13674-2:2016ISO 13674-2:2016(E)3.4gradientratio of change in the ordinate with respect to a unit change in the abscissa, for a straight-line fit to a pair of recorded variables plotted one against the other on Cartesian coordinates4 PrincipleOn-c
32、entre handling represents that part of the straight-line directional stability characteristics of the vehicle existing at low lateral acceleration levels, typically no greater than 1 m/s2. On-centre handling is concerned primarily with features that directly influence the drivers steering input, suc
33、h as steering system and tyre characteristics. Thus, test schedules for the evaluation of on-centre handling behaviour seek to minimize other factors that influence the wider aspects of straight-line directional stability, such as disturbance inputs due to ambient winds and road irregularities.This
34、part of ISO 13674 defines test schedules that involve driving the vehicle in a nominally straight line at a constant forward speed. During the tests, driver inputs and vehicle responses are measured and recorded. From the recorded signals, characteristic values are calculated.5 Variables5.1 Referenc
35、e systemThe variables of motion used to describe vehicle behaviour in a test-specific driving situation shall be related to the intermediate axis system (X, Y, Z) (see ISO 8855).The location of the origin of the vehicle axis system (XV, YV, ZV) is the reference point and therefore should be independ
36、ent of the loading condition. The origin is therefore fixed in the longitudinal plane of symmetry at half-wheelbase and at the same height above ground as the centre of gravity of the vehicle at complete vehicle kerb mass (see ISO 1176).5.2 Variables to be measuredWhen using this test method, the fo
37、llowing variables shall be measured: steering-wheel angle, H; steering-wheel torque, MH; yaw velocity, d / dt; longitudinal velocity, vx; lateral acceleration, ay(see the NOTE to 6.2).The following variables should be measured: steering-wheel angular velocity, dH/ dt; roll angle, .The variables are
38、defined in ISO 8855.In order to acquire a deeper understanding of the vehicle behaviour, it may be desirable to determine motions of various components within the steering system, especially for vehicles with more than one steering axle.2 ISO 2016 All rights reservedBS ISO 13674-2:2016ISO 13674-2:20
39、16(E)6 Measuring equipment6.1 DescriptionThe measuring equipment shall be in accordance with ISO 15037-1.Typical operating ranges and recommended maximum errors of the combined transducer and recording system are shown in Table 1.NOTE It is advisable that care be taken to ensure that friction or ine
40、rtia added to the system by steering robot or steering transducers does not improperly influence the measurement of steering-wheel torque.Table 1 Variables, typical operating ranges and recommended maximum errorsVariable Typical operating rangeaRecommended maximum error of the combined transducer an
41、d recorder systembSteering-wheel angle 50 0,1Steering-wheel torque 10 Nm 0,1 NmYaw velocity 10 /s 0,1 /sLongitudinal velocity 0 50 m/s 0,5 m/sLateral acceleration 5 m/s20,1 m/s2Steering-wheel angular velocity 100 /s 1 /sRoll angle 5 0,05Transducers for measuring some of the listed variables are not
42、widely available and are not in general use. Many such instruments are developed by users. If any system error exceeds the recommended maximum value, this and the actual maximum error shall be stated in the test report (ISO 15037-1:2006, Annex A).aThese transducer ranges are appropriate for the stan
43、dard test conditions and may not be suitable for non-standard test conditions.bThe values for maximum errors are provisional until more experience and data are available.6.2 Transducer installationsThe transducers shall be installed according to the manufacturers instructions, where such instruction
44、s exist, so that the variables corresponding to the terms and definitions of ISO 8855 can be determined.If a transducer does not measure a variable directly, appropriate transformations into the specified reference system shall be carried out.NOTE Lateral acceleration, as defined, is measured in the
45、 intermediate XY plane. However, for the purpose of this test procedure, measurement of “sideways” acceleration in the vehicle XvYvplane (i.e. corrupted by vehicle roll) is typically adequate, provided that the roll angle versus lateral acceleration characteristic for the vehicle is known and an app
46、ropriate correction in respect of roll angle can be made to the “sideways” acceleration.6.3 Data processingSee ISO 15037-1:2006, 4.3.7 Test conditions7.1 GeneralGeneral comments relating to test conditions are given in ISO 15037-1:2006, Clause 5. ISO 2016 All rights reserved 3BS ISO 13674-2:2016ISO
47、13674-2:2016(E)7.2 Test trackThe test track requirements shall be in accordance with those of ISO 15037-1:2006, 5.2. In addition, the lateral gradient of the test surface should not exceed 1 %.7.3 Wind velocityDuring a test, the ambient wind velocity shall not exceed 5 m/s when measured at a height
48、above ground of not less than 1 m. Ideally, the maximum ambient wind velocity should not exceed 1,5 m/s. If this cannot be achieved, then conditions of significant “gusting” should be avoided, i.e. testing should be avoided in conditions where changes in wind velocity exceed a range of 1,5 m/s. In t
49、he event that the ambient velocity exceeds 1,5 m/s or the range of “gusting” exceeds 1,5 m/s, or both, the vehicle should be tested in a direction such that the ambient wind is a tail wind. For each test, the climatic conditions shall be recorded in the test report (see ISO 15037-1:2006, Annex B).Where measurement of wind velocity is not possible, estimation by use of the Beaufort scale is suggested (see Table 2).Table 2 Estimation scale for wind intensity for observer without measu
