1、BRITISH STANDARDBS ISO 11157:2005Road vehicles Brake lining assemblies Inertia dynamometer test methodICS 43.040.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g4
2、3g55g3g47g36g58BS ISO 11157:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 17 January 2006 BSI 17 January 2006ISBN 0 580 47100 4National forewordThis British Standard reproduces verbatim ISO 11157:2005 and implements it as the UK nationa
3、l standard. It supersedes BS ISO 11157:1999 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee AUE/11, Braking systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cros
4、s-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Stand
5、ards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the r
6、esponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover
7、, the ISO title page, pages ii to iv, pages 1 to 20, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsReference numberISO 11157:2005(E)INTERNATIONAL STANDARD
8、ISO11157Second edition2005-09-15Road vehicles Brake lining assemblies Inertia dynamometer test method Vhicules routiers Ensembles de garnitures de frein Mthode dessai sur banc dynamomtrique inertie BS ISO 11157:2005ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms, defin
9、itions and symbols 1 3.1 Terms and definitions. 1 3.2 Symbols . 2 4 General. 3 5 Test equipment . 3 6 Test conditions . 4 7 Test method. 4 7.1 General. 4 7.2 Type-0 test (cold performance test) 4 7.3 Type-l test (fade test) 5 7.4 Type-II test (downhill behaviour test) . 6 7.5 Type-III test (fade tes
10、t) 7 8 Assessment of test data and presentation of results. 8 8.1 Legal requirements and evaluation of test results 8 8.2 Type-0 test . 8 8.3 Type-I, Type-II and Type-III test . 9 8.4 Example of an assessment 9 9 Inspection of brake linings or pads 10 Annex A (informative) Alternative equations for
11、the calculation of the MFDD 16 Annex B (informative) Accuracy considerations 18 BS ISO 11157:2005iv 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
12、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 that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the wo
13、rk. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Inte
14、rnational 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 t
15、he 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 11157 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This second edition cancels and
16、 replaces the first edition (ISO 11157:1999), which has been technically revised. BS ISO 11157:20051Road vehicles Brake lining assemblies Inertia dynamometer test method 1 Scope This International Standard specifies a dynamometer test method to homologate alternative types of brake linings (includin
17、g pads) mounted on original equipment, in accordance with UN-ECE Regulation No. 13-09, Annex 15. This International Standard is applicable to road vehicles of categories M, N and O (see 3.1) as defined in UN ECE Consolidated resolution of the construction of vehicles, R.E.3, Annex 7. Application for
18、 approval corresponding to this test method is to be made by the vehicle manufacturer (in the case of vehicles of category O the application is to be made by the axle or brake manufacturer) or by his duly accredited representative. The values in square brackets, i.e. , are taken from UN-ECE Regulati
19、on No. 13-09. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 611:2003
20、, Road vehicles Braking of automotive vehicles and their trailers Vocabulary ISO 1176:1990, Road vehicles Masses Vocabulary and codes ISO 3833:1977, Road vehicles Types Terms and definitions UN-ECE Regulation No. 13, Uniform provisions concerning the approval of vehicles of categories M, N and O wit
21、h regard to braking, incorporating the 09 series of amendments. 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms, definitions and symbols given in ISO 611, ISO 1176, ISO 3833 and the following apply. 3.1.1 category M power-driven vehicles having
22、 at least four wheels and used for the carriage of passengers 3.1.2 category N power-driven vehicles having at least four wheels and used for the carriage of goods 3.1.3 category O trailers (including semi-trailers) BS ISO 11157:20052 3.2 Symbols Symbol Unit Description di, djm/s2mean deceleration w
23、ithin the time window i resp. j dmm/s2mean fully developed deceleration (MFDD) d(t), d(T) m/s2deceleration in dependence of time t resp. T fd required accuracy of the MFDD fS required accuracy for the measurement of the stopping distance fv required accuracy for the measurement of the prescribed spe
24、ed I kg/m2rotational inertia i, j index characterizing all events which can be consecutively allocated to a time window with a given duration tdm kg mass acting on the ground for the wheel(s) under consideration ni number of pulses within the time window i r m dynamic tyre rolling radius Sdm stoppin
25、g distance travelled between vband veSim distance travelled within the time window i Spbm stopping distance travelled between vpand vbSpem stopping distance travelled between vpand vet, T s time used as a variable in different functions tbs time at the beginning of the evaluation range for a braking
26、 action tds time window in which values of interest are measured tes time at the end of the evaluation range for a braking action TiNm mean torque within the time window i tSs time at the end of a braking action vairkm/h velocity of the cooling air vbkm/h vehicle speed at 0,8 vpvekm/h vehicle speed
27、at 0,1 vpvikm/h mean speed within the time window i vmaxkm/h max. vehicle speed vpkm/h prescribed vehicle speed vtkm/h vehicle test speed at initiation of braking v1km/h initial speed at beginning of braking for heating procedures with repeated braking wS necessary pulse-rate of one revolution for t
28、he measurement of the stopping distance wv necessary pulse-rate of one revolution for the measurement of the speed wd necessary pulse-rate of one revolution for the measurement of the deceleration BS ISO 11157:200534 General 4.1 The test method described can be applied in the event of a modification
29、 of vehicle type resulting from the fitting of alternative types of brake linings on the original equipment of vehicles which have been approved in accordance with UN-ECE Regulation No. 13-09. 4.2 The alternative types of brake linings shall be checked by comparing their performance with that obtain
30、ed from the brake linings with which the vehicle was equipped at the time of approval and conforming to the components identified in the relevant information document, a model of which is given in UN-ECE Regulation No. 13-09, Annex 2. 4.3 The technical service which is responsible for conducting app
31、roval tests may, at its discretion, require that comparison of the performance of the brake Iinings be carried out in accordance with UN-ECE Regulation No. 13-09, Annex 4. 4.4 Application for approval by comparison shall be made by the vehicle manufacturer (in the case of category O vehicles the app
32、lication shall be made by the axle or brake manufacturer) or by the manufacturers duly accredited representative. 4.5 For the purposes of this International Standard, the term “vehicle” means the vehicle type which has been approved according to UN-ECE Regulation No. 13-09, and for which the compari
33、son is required to lead to satisfactory results. 4.6 The vehicle (or axle/brake) manufacturer shall ensure that all requirements of UN-ECE Regulation No. 13-09 for the vehicle (or axle/brake) fitted with the alternative types of linings are fulfilled. 5 Test equipment 5.1 An inertia dynamometer havi
34、ng the characteristics specified in 5.2 to 5.5 shall be used for the test. 5.2 The dynamometer shall be capable of generating the inertia specified in 6.1 and have the capacity to meet the requirements specified in 1.5, 1.6 and 1.7 of UN-ECE Regulation No. 13-09, Annex 4, with respect to Type-I, Typ
35、e-II and Type-III tests. 5.3 The brake fitted shall be identical with that of the original vehicle type. Inconsequential changes to the lining configuration are permitted e.g. chamfers, slots, wear indicators, anti-noise devices). 5.4 Air cooling, if provided, shall be in accordance with 6.4. 5.5 Th
36、e instrumentation for the test shall be capable of providing at least the following data: a) continuous recording of disc or drum rotational speed; b) number of revolutions completed during a stop, with a tolerance as described in Annex B; c) stopping time; d) continuous recording of the temperature
37、 measured at the centre of the path followed by the lining or at mid-thickness of the disc or drum or lining; e) continuous recording of control line pressure or force during brake application; f) continuous recording of brake output torque. BS ISO 11157:20054 6 Test conditions 6.1 The inertia dynam
38、ometer shall be set as close as possible, with a tolerance of 5 %, to the rotary inertia which corresponds to that part of the total inertia of the vehicle braked by the wheel(s) under consideration, according to the following formula: I = m r2(1) where m is that part of the maximum mass of the vehi
39、cle braked by the wheel(s) under consideration. This mass shall be calculated from the design braking force distribution for vehicles of categories M and N when deceleration corresponds to the appropriate value given in 2.1 of UN-ECE Regulation No. 13-09, Annex 4. For category O vehicles the value o
40、f m is that of the mass acting on the ground for the wheel(s) under consideration, when the vehicle is stationary and Ioaded to its maximum mass as given in 3.1 of UN-ECE Regulation No. 13-09, Annex 4. 6.2 The initial rotational speed of the inertia dynamometer shall correspond to the vehicle speed
41、as specified in UN-ECE Regulation No. 13-09 Annex 4, and shall be based on the dynamic rolling radius of the tyre. 6.3 Brake Iinings shall be at least 80 % bedded and shall not have exceeded a temperature of 180 C during bedding, or alternatively, at the vehicle manufacturers request, be bedded in a
42、ccordance with his recommendations. 6.4 Cooling air may be used, directed perpendicularly to the axis of rotation of the wheel. The velocity of the cooling air flowing over the brake shall be air0,33tvv= (2) where: vt= vehicle test speed at initiation of braking. The cooling air shall be at ambient
43、temperature. 6.5 The same dynamometer and equipment shall be used to conduct the tests described in Clause 7. 7 Test method 7.1 General 7.1.1 Five (or less as agreed with the technical service, but at least three) sample sets of the alternative types of brake Iinings shall be subjected to the compar
44、ison test; they shall be compared with the same number of sample sets of the original equipment brake linings conforming to the original components identified in the information document for the first approval of the vehicle. For category O vehicles, the information document concerning the appropria
45、te axle or brake type approval test shall be used as the basis. 7.1.2 Brake lining equivalence shall be based on comparison of the results achieved using the test methods in this International Standard and in accordance with the requirements of 7.2 to 7.5. 7.2 Type-0 test (cold performance test) 7.2
46、.1 The brake applications shall be made when the initial temperature is between 50 C and 100 C measured in accordance with 5.5 d). 7.2.2 Brake applications shall be made from an initial rotational speed equivalent to the specified test speed of the vehicle see Tables 1 a) and 1 b). This test shall c
47、onsist of at least five stops from the specified speed BS ISO 11157:20055and use reasonably spaced increments of input to generate a graph of “braking performance” (measured as mean fully developed deceleration, or MFDD) versus “input” (force, line pressure, etc.) for each sample. One measurement sh
48、all be at least equal to the specified braking performance see Tables 1 a) and 1 b) which will be used as the “Type-0 test reference value”. Table 1 Legal requirements a) for vehicle categories M and N Vehicle category Specified test speed MFDD km/h m/s2M1 80 5,8 M2 60 5,0 M3 60 5,0 N1 80 5,0 N2 60
49、5,0 N3 60 5,0 b) for vehicle category O Specified braking Performance Vehicle type Specified test speed Braking rate MFDD km/h m/s2O (semi-trailer) 60/40 a0,45 4,4 O (fuIl trailer) 60/40 a0,50 4,9 O (centre axle trailer) 60/40 a0,50 4,9 a40 km/h for cold performance test as comparison for Type-l test. 7.2.3 The MFDD assessed during the cold performance test on the alternative types of brake linings being tested for the purposes of comparison shall be, for the same input, within the test limits 15 % of the MFDD assessed w
