SAE-J1505-2004.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2004 SAE International All rights reserved. No part of this publication may
3、 be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fa
4、x: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org SURFACE VEHICLE RECOMMENDED PRACTICE J1505 REV. APR2004 Issued1985-05 Revised2004-04 Superseding J1505 APR1995 Brake Force Distribution Test ProcedureTrucks and Buses ForewordThis Document has been changed to reflect a 5-year re
5、view and update. 1.ScopeThis SAE Recommended Practice provides the test procedure and instructions for air braked single unit trucks, buses, and combination vehicles. It also provides recommendations for: a.Instrumentation and equipment b.Vehicle preparation c.Calculating distribution of brake force
6、 1.1PurposeThis procedure provides a method to determine the brake force distribution and threshold pressures for trucks and buses with a GVWR greater than 4536 kg (10 000 lb). 2.References 2.1Applicable PublicationsThe following publications form a part of the specification to the extent specified
7、herein. Unless otherwise indicated, the latest revision of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1854Brake Force/Distribution Performance GuideTrucks and Buses SAE J2115Brake Performance and Wear Test Code Comme
8、rcial Vehicle Inertia Dynamometer SAE J1626Braking, Stability, and Control Performance Test Procedures for Air- and Hydraulic-Brake Equipped Trucks, Truck-Tractors and Buses 2.2Related PublicationThe following publication is provided for information purposes only and is not a required part of this s
9、pecification. 2.2.1FMVSS PUBLICATIONAvailable from The Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. FMVSS 121Air Brake Systems SAE J1505 Revised APR2004 -2- 3.Instrumentation, Equipment, and Facilities 3.1Each vehicle should be equipped with: 3.1.1A speed measu
10、ring device capable of measuring vehicle speed to within 0.32 km/h (0.2 mph). 3.1.2A means of measuring time to within 0.1 s between two speeds such as a strip chart recorder or digital timer that receives a signal from the speed measuring device. 3.1.3Two pressure transducers and a recording device
11、 accurate to within 3.5 kPa (0.5 psi). 3.1.4Brake lining thermocouples as per SAE J2115 and a suitable temperature readout device accurate to within 11 C (20 F). If brake lining thermocouples are not used, a contact pyrometer or other method may be used to ensure that adequate cooling time is provid
12、ed between tests to ensure that brake heating and fade do not contaminate results. 3.1.5Valving to allow brakes on each axle or axle set to be operated, controlled, and evaluated independently. Valving must not disturb the inherent pressure differentials in the vehicle brake system and provide drive
13、r override capability. 3.1.6An external application system (see Figure 1) that can apply the braking system with a constant input is recommended. (Use of the drivers foot to apply the brakes may increase variation in the test results). This system must be designed, installed, and utilized in such a
14、way as to take into account the inherent pressure differentials in the vehicle brake system. FIGURE 1EXTERNAL SYSTEM FOR BRAKE APPLICATION SAE J1505 Revised APR2004 -3- 3.1.7A system such as a treadle stop may be used provided that the brakes are applied at a controlled rate so as to minimize pressu
15、re overshoot during the brake application. Caution must be exercised when applying the brakes on individual axles during partial system testing. The stopping ability of the vehicle will be reduced. 3.1.8Measure and record ambient temperature and wind conditions, including wind speed and direction. 3
16、.1.9Test should be run on a straight 3.6 m (12-ft) wide roadway with a dry Portland cement concrete or equivalent surface to reduce the likelihood of wheel lock-up. The vehicle shall be aligned with the center of the roadway at the beginning of each stop. The roadway should be dry and flat with no m
17、ore than a 1% grade in all directions, including crown. 4.Vehicle Information and Data 4.1Vehicle information sheet (Figure 2) to be filled in prior to starting test. 4.2Test data sheet (Figure 3) to be used as a work sheet during testing. 4.3Vehicle information and test data sheets may be used for
18、or extended to single unit trucks, buses, or multiple combination vehicles. 5.Vehicle ConditionBrake force distribution may be determined for any lining condition new or in service; however, to ensure the accuracy and validity of results, the following conditions should be met: 5.1Inspect the brake
19、lining and mating surface. Replace if abnormal conditions exist or worn beyond manufacturers recommended limits. Adjust brakes to manufacturers specifications. 5.2Lining to drum or disc contact should be at least 90% of contact area. If contact area is not at least 90%, burnish procedure may be cont
20、inued as specified in 5.6 until contact area is at least 90%. 5.3Inspect tires and replace if worn beyond manufacturers recommended limits or abnormal tire condition. Adjust tire pressure per vehicle manufacturers load recommendations. 5.4All components between the air compressor and each of the bra
21、ke chambers must be functioning properly. 5.5Initial testing each day should be preceded by a series of brake snubs which will warm the brakes to 93 to 149 C (200 to 300 F). 5.6In order to satisfy SAE J1854 guidelines, the vehicle brakes shall be burnished prior to testing with the procedure as spec
22、ified in SAE J1626 Section 11 or FMVSS 121 Section 6.1.8. 6.Braking Distribution Tests 6.1Install and secure instrumentation and test equipment in the test vehicle. One of the pressure transducers should be installed at the axle under test, down stream of any relay or proportioning valves; the other
23、 should be installed at the tractor to trailer or truck to trailer control glad-hand as the reference transducer. The axle transducer is moved from axle-to-axle as necessary and is used to ensure that brakes are fully activated (i.e., at steady-state) before data collection occurs. The reference tra
24、nsducer at the glad-hand is used to ensure that the desired input level is achieved. All data is related back to the reference level for braking force distribution calculations. The axle transducer may be omitted if the relationship between the reference pressure and the brake pressure is known and
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