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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 217-1a:1987 Incorporating Amendment No. 1 Maximum road speed limiters for motor vehicles Part 1: Specification for installed requirements UDC 629.11-585.7 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00
2、 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 May 1987 BSI 02-2000 The following BSI references relate to the
3、 work on this standard: Committee reference AUE/13 Draft for comment 86/75132 DC ISBN 0 580 15912 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Committee (AUE/-) to Technical Committee AUE/13, upon which the foll
4、owing bodies were represented: British Railways Board Department of Transport (Highways) Freight Transport Association Institute of Road Transport Engineers (Incorporated) London Regional Transport Ministry of Defence National Bus Company Road Haulage Association Ltd. Society of Motor Manufacturers
5、and Traders Limited Amendments issued since publication Amd. No.Date of issueComments 5969June 1988Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 BSI 02-
6、2000i Contents Page Committees responsibleInside front cover Forewordii Section 1. General 1Scope1 2Definitions1 Section 2. Performance 3Speed control on level ground1 4Speed control on descending gradients1 5Failure modes1 6Checking and calibration2 Section 3. Installation 7General2 8Tamper-proofin
7、g2 9Power supply2 10Marking2 Appendix A Test conditions and procedure for demonstrating compliance with speed control requirements3 Figure 1 Allowed tolerances of limiter response characteristic2 Publication referred toInside back cover Licensed Copy: London South Bank University, London South Bank
8、University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 ii BSI 02-2000 Foreword This Part of BS AU 217 has been prepared under the direction of the Automobile Standards Committee at the request of the Department of Transport. Part 2 of BS AU 2171) deals with requ
9、irements relating to the performance of components of speed limiter devices. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself conf
10、er immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated
11、 in the amendment table on the inside front cover. 1) In preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 BSI 02-20001 Section 1. General 1 Scope This Part of BS AU 217 specifies r
12、equirements for the performance and installation of devices designed to limit the maximum road speed of motor vehicles by control of engine power. NOTE 1Unless otherwise referred to in clause 2, the device is referred to hereafter as the limiter. NOTE 2Permitted tolerances of the system may allow th
13、e vehicle to exceed the set speed. 2 Definitions For the purposes of this Part of BS AU 217 the following definitions apply. 2.1 sensed speed the speed of a motor vehicle as indicated by, or measured from, the speed sensing device used as part of the vehicles road speed limiter 2.2 set speed the int
14、ended mean vehicle speed when operating in a stabilized condition in accordance with 3.3. It is marked on the vehicle and used for calibration purposes 2.3 Vmin the minimum speed declared by the limiter supplier at which the limiter may be set and meet the requirements of this standard 2.4 Vmax the
15、maximum speed declared by the limiter supplier at which the limiter may be set and meet the requirements of this standard 2.5 limiter supplier in the case of maximum road speed limiters fitted in the course of construction of the vehicle, the vehicle constructor. In all other cases, the limiter manu
16、facturer or his agent 2.6 limiter calibrator the person responsible for carrying out the final check of the installation and the calibration procedures (see clause 6) 2.7 engine the source (or sources) of the vehicles motive power 2.8 kerbside mass the mass of a vehicle when it carries: a) no person
17、; and b) a full supply of fuel in its tank, an adequate supply of other liquids incidental to its propulsion and no load other than the loose tools and equipment with which it is normally equipped. Section 2. Performance 3 Speed control on level ground 3.1 General When tested in accordance with the
18、procedure given in Appendix A, the requirements given in 3.2 and 3.3 shall be met for each of the test runs. Speed shall be sensed to an accuracy of within 1.5 mile/h ( 2.4 km/h) of actual vehicle speed within the range Vmin to Vmax. 3.2 Transient response (see Figure 1) After the set speed is first
19、 achieved: a) sensed speed shall not exceed the set speed by more than 3 mile/h (4.8 km/h); b) the rate of change of sensed speed shall not exceed 0.5 m/s2; and c) the stabilized speed conditions specified in 3.3 shall be attained within 10 s of first reaching the set speed. 3.3 Stabilized speed (se
20、e Figure 1) When stable speed control has been achieved: a) sensed speed shall not differ from the set speed by more than 2 mile/h (3.2 km/h); b) sensed speed shall not vary by more than 2 mile/h (3.2 km/h); and c) the rate of change of sensed speed shall not exceed 0.2 m/s2. 4 Speed control on desc
21、ending gradients When the vehicle, running at its set speed and with the drivers accelerator at its position of maximum travel, is subject to an accelerating force due to a down gradient, the limiter shall control speed by restricting the engine power to the limiters minimum engine power control set
22、ting. NOTEThe limiter may allow normal accelerator control for the purposes of gear changing. 5 Failure modes No malfunction of the limiter shall result in an increase in engine power above that demanded by the position of the drivers accelerator. Licensed Copy: London South Bank University, London
23、South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 2 BSI 02-2000 6 Checking and calibration The limiter supplier shall provide documentation describing checking and calibration procedures. It shall be possible to check the set speed whilst the veh
24、icle is stationary. Section 3. Installation 7 General The limiter shall be suitable for installation in the vehicle and shall be installed in accordance with the limiter suppliers technical instructions. 8 Tamper-proofing The limiter and its connections necessary for its operation, except those esse
25、ntial for the running of the vehicle, shall be capable of being protected from any unauthorized adjustments or the interruption of its energy supply by the attachment of sealing devices and/or the need to use special tools. 9 Power supply All components necessary for the full function of the limiter
26、 shall be energized whenever the vehicle is being driven. 10 Marking The vehicle shall be marked with the following. a) The name or trade mark of the limiter calibrator. b) The number and date of this British Standard, i.e. BS AU 217-1a:1987. c) The set speed, expressed in mile/h, at which the vehic
27、le is calibrated. NOTESet speed may additionally be shown in km/h. Figure 1 Allowed tolerances of limiter response characteristic Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 BSI 02-20003 A
28、ppendix A Test conditions and procedure for demonstrating compliance with speed control requirements NOTEWhere the limiter is designed for fitting to a range of vehicles, it is recommended that the tests are performed on a “worst case” vehicle, so that the need for additional testing is minimized. E
29、xamples of worst case situations are as follows. a) Maximum engine power to mass ratio of the tested vehicle at Vmax+ 10 %. b) Lowest overall gearing which allows the set speed to be attained, i.e. minimum vehicle speed to engine speed in top gear ratio. c) Where the limiter actuator is a separate c
30、omponent in the engine power control, the minimum travel of the actuator between maximum and minimum engine power control positions. A.1 Ambient weather conditions Mean wind speed shall be less than 6 m/s with gusts not exceeding 10 m/s. The test surface shall be free from standing water, snow or ic
31、e. A.2 Vehicle condition The vehicle shall be at its kerbside mass, plus the mass of the driver and any observer and test equipment. The tyres shall be nominally new, i.e. negligible wear, and inflated to the pressure recommended by the vehicle manufacturer for operation at the vehicles maximum gros
32、s weight. The power train components shall be within their normal operating temperature ranges. A.3 Surface condition The test surface shall be suitable to enable stabilized speed to be maintained, and shall be free from uneven patches. Gradients shall not exceed 2 % and shall not vary by more than
33、1 %, excluding camber effects. A.4 Instrumentation During the test, the instantaneous actual vehicle speed and sensed speed shall be continuously recorded. NOTE 1It is recommended that the accuracy of recorded measured speeds should be 0.2 % against a time base accurate to within 0.3 %. NOTE 2To obt
34、ain an accurate measure of vehicle speed, a number of steady speed runs in the range Vmin to Vmax may be needed (using the limiter to provide these steady speeds if convenient). The runs should be performed over a known distance and the time taken to cover this distance recorded. From the data colle
35、cted calculations can then be made of the ratios between recorded speeds and derived speeds, their mean and standard deviations. A.5 Procedure Drive the vehicle at a speed equal to 90 % of the set speed, and demand full engine power by moving the accelerator to its position of maximum travel as rapi
36、dly as possible. Maintain the accelerator at its position of maximum travel for not less than 30 s. Conduct the test three times in each gear, which allows the set speed to be reached. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Unco
37、ntrolled Copy, (c) BSI 4 blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 BSI 02-2000 Publication referred to BS AU 217, Maximum road speed limiters for motor vehicles. BS AU 217-2, Speci
38、fication for performance of components2). 2) Referred to in the foreword only. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:04:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 217-1a:1987 BSI 389 Chiswick High Road London W4 4AL BSI British Standards In
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