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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this p
3、ublication may 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2349_201211SURFACE VEHICLE RECOMMENDED PRACTICE J2349 NOV2012 Issued 1997-03 Rev
5、ised 2012-11 Superseding J2349 MAR2002 Electric Windshield Wiper Switch - Trucks, Buses, and Multipurpose Vehicles RATIONALE Made minor corrections to sections 1.a. and 3.1. 1. SCOPE This SAE Recommended Practice establishes for trucks, buses, and multipurpose vehicles with GVW of 4500 kg (10 000 lb
6、) or greater: a. Minimum performance requirements for the switch for electrically or electro-pneumatically powered windshield wiping systems. b. Uniform test procedures that include those tests that can be conducted on uniform test equipment by commercially available laboratory facilities. The test
7、procedures and minimum performance requirements, outlined in this document are based on currently available engineering data. It is the intent that all portions of the document will be periodically reviewed and revised as additional data regarding windshield wiping system performance are developed.
8、2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendal
9、e, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J258 Circuit Breaker - Internal Mounted - Automatic Reset SAE J2348 Electric Windshield Washer Switch - Trucks, Buses, and Multipurpose Vehicles SAE J2349 Revised NOV2012 Page 2 of 3 2.2 Relat
10、ed Publications The following publications are provided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724
11、776-4970 (outside USA), www.sae.org. SAE J112 Electric Windshield Wiper Switch SAE J198 Windshield Wiper System - Trucks, Buses, and Multipurpose Vehicles SAE J553 Circuit Breakers 3. DEFINITIONS 3.1 ELECTRIC WINDSHIELD WIPER SWITCH Part of an electric or electro-pneumatic windshield wiper system b
12、y which the operator of a vehicle causes the windshield wipers to function. 4. REFERENCE STANDARD If the switch employs an internal circuit breaker(s), the circuit breaker shall comply with the requirements of SAE J258. 5. TEMPERATURE TEST 5.1 To insure basic function, the switch shall be manually c
13、ycled for 10 cycles at design electrical load at 24 C 5.5 C (75 F 10 F); 74, +0, 2.8 C (165, +0, 5 F); and 32, +2.8, 0 C (25, +5, 0 F) after a 1 h exposure at each of these temperatures. The switch shall be electrically and mechanically operable during each of these cycles. 5.2 This same switch shal
14、l be used for the endurance test described in Section 6. 6. ENDURANCE TEST SETUP 6.1 The switch shall be set up to operate its design electrical load. 6.2 The test shall be set up to operate the switches for the prescribed number of completed cycles. One complete cycle shall consist of sequencing th
15、rough each position from Lo, Medium (if applicable), Hi (with dwell in each position) and return with dwell in intermediate positions to the initial position. The test equipment shall be so arranged as to provide the following mechanical time requirements: a. Travel Time - 0.1 to 0.5 s (time from on
16、e position to the next) NOTE: If the switch employs a rheostat, the travel time through the rheostat segment in each direction shall be 1.0 to 3.0s. b. Dwell Time - 0.50 to 1.0 s (time in each position) NOTE: After switching to OFF, if a motor is used, sufficient dwell time shall be provided to allo
17、w the motor to park. The dwell time in OFF can then be greater (if required) than the dwell time range indicated previously. SAE J2349 Revised NOV2012 Page 3 of 3 6.3 During the test, the switch shall be operated at 12.8 V dc for a 12-V system, or 25.6 V dc for a 24-V system. These voltages shall be
18、 measured at the input termination on the switch. The power supply shall not generate any adverse transients not present in motor vehicles and shall comply with the following specification: a. Output Current - Capable of supplying the continuous current of the design electrical load. b. Regulation 1
19、 Dynamic - The output voltage at the supply shall not deviate more than 1.0 V from zero to maximum load (including inrush current) and shall recover 63% of its maximum excursion within 100 ms. 2. Static - The output voltage at the supply shall not deviate more than 2% with changes in static load fr
20、om zero to maximum (not including inrush current), and means shall be provided to compensate for static input line voltage variations. c. Ripple Voltage - Maximum 300 mV peak-to-peak. 7. ENDURANCE REQUIREMENTS 7.1 The switch shall be capable of satisfactorily operating for 10 000 complete cycles at
21、a temperature of 24 C 5.5 C (75 F 10 F) followed by 1 h ON in low position at 24 C 5.5 C (75 F 10 F). 7.2 The average voltage drop from the input terminal(s) to the corresponding output terminal(s) shall be measured before and after the endurance test and shall not exceed 0.30 V (excluding rheostat)
22、 the average of three consecutive readings, at design load. If wiring is an integral part of the switch, the voltage drop measurement shall be made at switch terminals. 8. COMBINATION WINDSHIELD WIPER AND WASHER SWITCH The same combination switch shall be used for the test of each function. If the
23、washer and wiper functions are mechanically coordinated, the functions shall be tested simultaneously. The wiper switch shall meet the requirements of this document. The washer switch shall meet the requirements of SAE J2348. 9. NOTES 9.1 Marginal Indicia A change bar (l) located in the left margin
24、is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TRUCK AND BUS WINDSHIELD WIPERSAND CLIMATE CONTROL COMMITTEE OF THE SAE TRUCK AND BUS BODY AND OCCUPANT ENVIRONMENT STEERING COMMITTEE
