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 2017 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:/standards.sae.org/J68_201704 SURFACE VEHICLE RECOMMENDED PRACTICE J68 APR2017 Issued 1979-10 Revised 2017-04 Supe
5、rseding J68 FEB2004 Tests for Snowmobile Switching Devices and Components RATIONALE Paragraph numbers in 2.1.1 for SAE J575 have been changed to correspond with the paragraph numbers in SAE J575 April 2010. 1. SCOPE This SAE Recommended Practice covers standardized basic tests, test methods, and req
6、uirements applicable to electromechanical switching devices which may be used on snowmobiles as defined in SAE J33. 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
7、publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J33 Snowmobile Definitions and Nomenclature - General SAE J45 Brake Syste
8、m Test Procedure - Snowmobiles SAE J575 Test Methods and Equipment for Lighting Devices for Use on Vehicles Less than 2032 mm in Overall Width SAE INTERNATIONAL J68 APR2017 Page 2 of 4 The following sections from SAE J575 are a part of this document. a. Paragraph 3.1 - Lighting Devices b. Paragraph
9、3.2 - Lamp Bulbs c. Paragraph 3.3 - Test Fixtures d. Paragraph 4.2 - Vibration Test e. Paragraph 4.9 - Moisture Test SAE J1222 Speed Control Assurance for Snowmobiles 3. DEFINITIONS 3.1 HEADLAMP BEAM SWITCH A headlamp beam switch is a driver-controlled device used to select the high or low beam head
10、lamp circuit. 3.2 STOP LAMP SWITCH A stop lamp switch is a device used to energize the stop lamp circuit with the operator actuation of the brake. 3.3 ACCESSORY SWITCH An accessory switch is a driver-controlled device used to activate accessories (i.e., hand warmers, etc.). 3.4 IGNITION SYSTEM SWITC
11、H An ignition system switch is a device(s) used to interrupt engine ignition such as: emergency shutoff switch, key switch, or speed control assurance device. 3.5 STARTER MOTOR SWITCH A starter motor switch is a driver-controlled device used to activate the starter motor. 4. HIGH TEMPERATURE TEST 4.
12、1 Determine effect of high temperature on the basic function of the switching device. 4.1.1 The switching device shall be exposed to a temperature of 49 C 3 C (120 F 5 F) for a minimum of 2 hours; however, if the switching device is exposed to a higher temperature in service, then the device shall b
13、e tested at this higher temperature. (Reference 4.1.1.1.) 4.1.2 To determine the maximum temperature to which the switching device is exposed, the snowmobile shall be operated for a minimum of 30 min under load, immediately followed by the fade and recovery test of paragraph 6.5 of SAE J45 at a temp
14、erature of at least 10 C (50 F) and use this temperature to conduct 4.1.1. If a minimum ambient of 10 C (50 F) cannot be obtained, subtract the available ambient temperature from 10 C (50 F) and add this difference to the maximum temperature to which the switching device is exposed. 4.1.3 After cond
15、itioning per 4.1.1, the switching device, while still at 49 C 3 C (120 F 5 F) or the higher service temperature, shall be manually cycled for 10 cycles per sequence requirements of Table 1. The switching device shall be electrically and mechanically operable during and after each cycle. 4.1.4 The sa
16、me switching device shall be used for the Low Temperature and Humidity Test, Section 5. SAE INTERNATIONAL J68 APR2017 Page 3 of 4 5. LOW TEMPERATURE AND HUMIDITY TEST 5.1 Determine effect of low temperature and high relative humidity on the basic function of the switching device. 5.1.1 The switching
17、 device shall be exposed to a temperature of 40 C 3 C (40 F 5 F) for a minimum of 2 hours. Next, after no more than 2 min, expose the switching device to an environment of +21 C 6 C (70 F 10 F) and a relative humidity between 60% and 90% for 30 minutes 10 minutes. Finally, after no more than 2 minut
18、es, return switching device to a temperature of 40 C 3 C (40 F 5 F) for 2 h 30 minutes. 5.1.2 After conditioning per 5.1.1, the switching device, while still at 40 C 3 C (40 F 5 F), shall be manually cycled for 10 cycles per sequence requirements of Table 1. The switching device shall be electricall
19、y and mechanically operable during and after each cycle. Table 1 Endurance test and requirements Device Sequence Cycle Design Performance Requirements Headlamp beam switch Hi-beam-Lo-beam-Hi-beam 10000 The switch shall be designed so that the headlight circuits are never maintained open Headlamp swi
20、tch Off-on-off 5000 Brake light switch Off-on-off 50000 Accessory switch Off-on-off 5000 Ignition system switch Emergency shutoff switch On-off-on (Single throw switch) or On-off-on-off-on (Dual throw switch) 10000 Key switch On-off-on 5000 May include start switch and other features or accessories
21、Speed control assurance device Passive (Device used only during speed control malfunction) On-off-on 10000 Refer to J1222 Active (Device actuated during every operation of speed controller) Off-on-off 300000 Starter motor switch Off-on-off 5000 Shall include solenoid if used Remote starter motor swi
22、tch Off-on-off 5000 The switch shall be designed such that the starter motor circuit is never maintained closed. May include key switch, Starter switch, and other features or accessories. 5.1.3 The same switching device shall be used for the Endurance Test, Section 6. SAE INTERNATIONAL J68 APR2017 P
23、age 4 of 4 6. ENDURANCE TEST AND REQUIREMENTS 6.1 Determine effect of cycling on the basic function of the switching device. 6.1.1 The switch shall be operated at no less than the rated electrical load of the circuit it is switching (i.e., headlamp, stop lamp, ignition system, etc.). The test shall
24、be run with DC except systems designed to operate on AC only, which may be tested with AC. 6.1.1.1 The power supply shall not generate any adverse transients not present in the snowmobile and shall comply with the following specifications: a. Output Current - Capable of supplying output and inrush c
25、urrent as required in 6.1.1. b. Regulator - DC supplies Dynamic - The output voltage shall not deviate more than 1.0 V from zero to maximum load (including inrush current). DC supplies should recover 63% of maximum excursion within 5 ms. Static - The output voltage shall not deviate more than 2% wit
26、h changes in static load (not including inrush current) and means shall be provided to compensate for static line voltage variations. Ripple Voltage - (DC supplies only) Maximum 300 MV peak to peak. 6.1.1.2 Speed control assurance devices actuated during every operation of the speed control shall be
27、 mechanically sequenced 300000 cycles, per Table 1. However, those same switching devices interrupting their electrical load only during speed control malfunction shall have the electrical load applied only during the last 10 000 of the total 300000 cycles. 6.1.2 The switch shall be subjected to an
28、endurance test as specified in Table 1, at a temperature of 21 C 6 C (70 F 10 F) and at a rate not exceeding 30 cpm. a. Travel time - 0.1 to 0.5 seconds maximum. (Time from one position to the next position.) b. Dwell time - 0.4 seconds minimum (in each position). The switch shall be electrically an
29、d mechanically operable during and after this test. 6.1.3 The voltage drop from the input to output terminals of the switching device shall be measured before and after the completion of the endurance test. This voltage drop shall not exceed 2% of the applied voltage at the rated electrical load of
30、the circuit as in 6.1.1. If the wiring is an integral part of the switching device, the voltage drop measurement is to be made including 76 mm (3 inch) of wire on each side of the switch terminals. NOTE: To expedite testing, separate switching device samples may be used for the vibration and corrosi
31、on test. 7. NOTES 7.1 Revision Indicator A change bar (l) located in the left margin 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 SNOWMOBILE TECHNICAL COMMITTEE
