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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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 InternationalAll rights reserved. No part of this publication may be
3、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)Fax: 724-
4、776-0790Email: custsvcsae.orgSAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLERECOMMENDEDPRACTICEJ68REV.FEB2004Issued 1979-10Revised 2004-02Superseding J68 DEC1991Tests for Snowmobile Switching Devices and Components1. ScopeThis SAE Recommended Practice covers standardized basic tests, test methods,
5、and requirementsapplicable to electromechanical switching devices which may be used on snowmobiles as defined in SAE J33.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. The latest issue of SAE publications shall appl
6、y.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J33Definitions for SnowmobilesSAE J45Brake System Test ProcedureSnowmobilesSAE J575Tests for Motor Vehicle Lighting Devices and ComponentsThe following sections from SAE J575 are a part of this document
7、.a. Paragraph 2.2.1Lighting Devicesb. Paragraph 2.2.2Lamp Bulbsc. Paragraph 2.2.3Test Fixturesd. Paragraph 3.1Vibration Teste. Paragraph 3.4Moisture TestSAE J1222Speed Control Assurance for SnowmobilesCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or
8、networking permitted without license from IHS-,-,-SAE J68 Revised FEB2004-2-3. Definitions3.1 Headlamp Beam SwitchA headlamp beam switch is a driver-controlled device used to select the high orlow beam headlamp circuit.3.2 Stop Lamp SwitchA stop lamp switch is a device used to energize the stop lamp
9、 circuit with the operatoractuation of the brake.3.3 Accessory SwitchAn accessory switch is a driver-controlled device used to activate accessories (i.e., handwarmers, etc.).3.4 Ignition System SwitchAn ignition system switch is a device(s) used to interrupt engine ignition such as:emergency shutoff
10、 switch, key switch, or speed control assurance device.3.5 Starter Motor SwitchA starter motor switch is a driver-controlled device used to activate the starter motor.4. High Temperature Test4.1 Determine effect of high temperature on the basic function of the switching device.4.1.1 The switching de
11、vice shall be exposed to a temperature of 49 C 3 C (120 F 5 F) for a minimum of2 hours; however, if the switching device is exposed to a higher temperature in service, then the device shallbe tested at this higher temperature. (Refer to 4.1.1.1.)4.1.1.1 To determine the maximum temperature to which
12、the switching device is exposed, the snowmobile shall beoperated for a minimum of 30 minutes under load, immediately followed by the fade and recovery test ofparagraph 6.5 of SAE J45 at a temperature of at least 10 C (50 F) and use this temperature to conduct4.1.1. If a minimum ambient of 10 C (50 F
13、) cannot be obtained, subtract the available ambienttemperature from 10 C (50 F) and add this difference to the maximum temperature to which theswitching device is exposed.4.1.2 After conditioning per 4.1.1, the switching device, while still at 49 C 3 C (120 F 5 F) or the higherservice temperature,
14、shall be manually cycled for 10 cycles per sequence requirements of Table 1. Theswitching device shall be electrically and mechanically operable during and after each cycle.4.1.3 The same switching device shall be used for the Low Temperature and Humidity Test, Section 5.5. Low Temperature and Humid
15、ity Test5.1 Determine effect of low temperature and high relative humidity on the basic function of the switching device.5.1.1 The switching device shall be exposed to a temperature of 40 C 3 C (40 F 5 F) for a minimum of2 hours. Next, after no more than 2 minutes, expose the switching device to an
16、environment of +21 C 6 C (70 F 10 F) and a relative humidity between 60% and 90% for 30 minutes 10 minutes. Finally, afterno more than 2 minutes, return switching device to a temperature of 40 C 3 C (40 F 5 F) for 2 hours 30 minutes.5.1.2 After conditioning per 5.1.1, the switching device, while sti
17、ll at 40 C 3 C (40 F 5 F), shall be manuallycycled for 10 cycles per sequence requirements of Table 1. The switching device shall be electrically andmechanically operable during and after each cycle.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or ne
18、tworking permitted without license from IHS-,-,-SAE J68 Revised FEB2004-3-5.1.3 The same switching device shall be used for the Endurance Test, Section 6.6. Endurance Test and Requirements6.1 Determine effect of cycling on the basic function of the switching device.6.1.1 The switch shall be operated
19、 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 be run with DC except systems designed tooperate on AC only, which may be tested with AC.6.1.1.1 The power supply shall not generate any adverse transients not
20、present in the snowmobile and shallcomply with the following specifications:a. Output CurrentCapable of supplying output and inrush current as required in 6.1.1.b. RegulatorDC suppliesDynamicThe output voltage shall not deviate more than 1.0 V from zero to maximum load (includinginrush current). DC
21、supplies should recover 63% of maximum excursion within 5 ms.StaticThe output voltage shall not deviate more than 2% with changes in static load (not including inrushcurrent) and means shall be provided to compensate for static line voltage variations.Ripple Voltage(DC supplies only) Maximum 300 MV
22、peak to peak.6.1.1.2 Speed control assurance devices actuated during every operation of the speed control shall bemechanically sequenced 300 000 cycles, per Table 1. However, those same switching devices interruptingtheir electrical load only during speed control malfunction shall have the electrica
23、l load applied only duringthe last 10 000 of the total 300 000 cycles.TABLE 1ENDURANCE TEST AND REQUIREMENTSDevice Sequence Cycle Design Performance RequirementsHeadlamp beam switch Hi-beam-Lo-beam-Hi-beam 10 000 The switch shall be designed so that the headlight circuits are never maintained openHe
24、adlamp switch Off-on-off 5000 Brake light switch Off-on-off 50 000Accessory switch Off-on-off 5000Ignition system switchEmergency shutoff switch On-off-on (Single throw switch) or On-off-on-off-on (Dual throw switch)10 000Key switch On-off-on 5000 May include start switch and other features or acces
25、soriesSpeed control assurance devicePassive (Device used only during speed control malfunction) On-off-on 10 000 Refer to J1222Active (Device actuated during every operation of speed controller) Off-on-off 300 000Starter motor switch Off-on-off 5000 Shall include solenoid if usedCopyright SAE Intern
26、ational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J68 Revised FEB2004-4-6.1.2 The switch shall be subjected to an endurance test as specified in Table 1, at a temperature of 21 C 6 C(70 F 10 F) and at a rate not excee
27、ding 30 cycles/minute.a. Travel time0.1 to 0.5 seconds maximum. (Time from one position to the next position.)b. Dwell time0.4 seconds minimum (in each position).The switch shall be electrically and mechanically operable during and after this test.6.1.3 The voltage drop from the input to output term
28、inals of the switching device shall be measured before andafter the completion of the endurance test. This voltage drop shall not exceed 2% of the applied voltage atthe rated electrical load of the circuit as in 6.1.1. If the wiring is an integral part of the switching device, thevoltage drop measur
29、ement is to be made including 76 mm (3 in) of wire on each side of the switch terminals.NOTE To expedite testing, separate switching device samples may be used for the vibration andcorrosion test.7. Notes7.1 Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the
30、user in locatingareas where technical revisions have been made to the previous issue of the report. An (R) symbol to the leftof the document title indicates a complete revision of the report.PREPARED BY THE SAE SNOWMOBILE COMMITTEECopyright SAE International Provided by IHS under license with SAENot
31、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J68 Revised FEB2004RationaleThe changes are as follows:2.1.1: Changed paragraph numbers and titles. This cleans up the links to SAE J575 without changingany of the information or intent.3.2: Struck definition of head
32、lamp switch. Headlamps are on at all times so a switch is no longerrequired.5.1.1: Added maximum relative humidity of 90%. Changed sentence structure to clarify meaning.Table 1, “Key Switch” row, “Design Performance Requirements” column: Expanded definition of itemsthat may use this switch to includ
33、e accessories or other features.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Practice covers standardized basic tests, test methods, andrequirements applicable to electromechanical switching devices which may be used on snowmobiles asdefined in SAE J33.R
34、eference SectionSAE J33Definitions for SnowmobilesSAE J45Brake System Test ProcedureSnowmobilesSAE J575Tests for Motor Vehicle Lighting Devices and ComponentsSAE J1222Speed Control Assurance for SnowmobilesDeveloped by the SAE Snowmobile CommitteeCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
