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 theref
2、rom, 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 2010 SAE International All rights reserved. No part of this publication ma
3、y 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: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J92_201008SURFACEVEHICLERECOMMENDEDPRACTICEJ92 AUG2010 Issued 1976-09Revised 2010-08 Supersedin
5、g J92 MAY1995 Snowmobile Throttle Control Systems RATIONALEThe changes and revisions included are designed to accommodate existing and potential new technology throttle systems design, specifically electronic control “Throttle by wire” or remote control systems.1. SCOPE This SAE Recommended Practice
6、 is intended to provide the minimum acceptable criteria for snowmobile hand throttle control systems. This recommendation is not intended to cover competition vehicles nor is it intended to limit development of new and/or improved technology in controls. Although these recommendations are primarily
7、addressed to hand control systems using an outer flexible conduit with a multiple strand inner cable, the basic requirements of freedom of movement, strength, material, etc., will apply to any system. 2. REFERENCE 2.1 Applicable Document The following publication forms a part of this specification t
8、o the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org
9、.SAE J33 Snowmobile Definitions and NomenclatureGeneral 3. DEFINITIONS 3.1 SNOWMOBILE As defined in SAE J33. 3.2 THROTTLE CONTROL A hand-controlled device mounted on the steering control; either a lever type (squeeze grip) or a twist grip type. (See Figure 1.) SAE J92 Revised AUG2010 Page 2 of 5FIGU
10、RE 1 - THROTTLE CONTROL 3.3 SPEED CONTROLLER A device such as a carburetor(s), fuel injection valves, sensors,electronic control device, etc., used to control the supply of energy (fuel) to the prime mover (enginemotor). 3.4 CONTROL TRANSFER A means of transmitting mechanical motion or electronic co
11、mmand (throttle by wire) between two or more points. 3.4.1 Control Cable Assembly A linkage consisting of a flexible assembly with an outer housing or conduit and an inner cable, usually multiple stranded; capable of transmitting motion between two points. This assembly is provided with connection m
12、eans on both ends of housing and cable. 3.4.2 Electronic Control A control interface by means of direct electronic connection or remote control. 3.5 THROTTLE CONTROL SYSTEM A complete system used to control engine(s) speed. This includes the throttle control, control linkage, sensors, electronic con
13、troller, speed controller input linkage, springs, brackets. etc., necessary for operation of the system. Any attachment to the system that affects its operation such as a warning light switch, safety switch, etc., shall be considered as part of the system. 3.6 RIGHT-RIGHT HAND, LEFT-LEFT HAND Design
14、ation refers to orientation of the vehicle when the operator is seated in the operators position, facing forward. 3.7 SHALL The word shall is to be understood as mandatory. 3.8 SHOULD The word should is to be understood as advisory. SAE J92 Revised AUG2010 Page 3 of 53.9 IDLE The position of the thr
15、ottle control system at which engine will not propel the vehicle, when the control linkage movement is restricted by a mechanical stop on the speed controller and engine rpm is within the idle range specified by the engine manufacturer.4. REQUIREMENTS AND RECOMMENDATIONS 4.1 Requirements The throttl
16、e control system shall meet the following minimum performance criteria when tested in accord with Section 5, or to design requirements by visual inspection. 4.1.1 The throttle control(s) shall be on the right side of the steering control adjacent to, or at, the right-hand position. 4.1.1.1 Lever typ
17、e throttle controls shall be positioned so that pivoting the lever toward the steering control shall move the speed controller to a higher speed position. 4.1.1.2 Twist grip type throttle controls shall move the speed controller to a higher speed position when rotation of the control about its axis
18、is in a counterclockwise direction when viewed from the right end or downward end. See Figure 1. 4.1.2 The throttle control system shall operate freely without hesitation or binding, and when released from any partial or full-speed position shall automatically return to its idle position within 1 s.
19、 4.1.3 The throttle control systems performance shall not be adversely affected by climatic conditions during vehicle operation.4.1.4 The throttle control system shall be protected from areas which would cause the systems temperature to exceed the temperature limit of the material used. 4.1.5 The th
20、rottle control system shall be protected so that with all guards and shrouds in place, it cannot be pulled or snagged in a manner that would accelerate the vehicle. 4.1.6 Motion of any part of the vehicle, such as the steering control, shall not cause activation, prevent activation, or jam the throt
21、tle control system. 4.2 Recommendations The following design recommendations should improve the performance and safety of a throttle control system. 4.2.1 Throttle control(s) should be designed with an abutment or stop independent of the control linkage that will limit rotation of the control near t
22、he idle and at the full-speed positions. 4.2.2 Adjustments For normal operation, the linkage should be adjusted in such a way that a full-speed position is obtained when the control is in contact with the high speed stop of 4.2.1. 4.2.3 The control system should be routed to avoid entrapment of mois
23、ture. 4.2.4 Control cable assembly, when used, should be routed with bend radii as large as practical. Where small radii are necessary, adequate strain relief protection should be provided to insure that the conduit will not kink. 4.2.5 The adequacy of the throttle control system should be verified
24、by field testing. SAE J92 Revised AUG2010 Page 4 of 55. TESTS 5.1 General Requirements 5.1.1 A minimum of two samples of each type of throttle control system are to be tested. 5.1.2 The throttle control system used throughout the following testing shall be identical to those to be used in vehicle pr
25、oduction.5.1.3 All throttle control system tests shall be conducted on a vehicle with production routing or on a suitable fixture that duplicates the location of components and routing. 5.1.4 Room temperature is defined as being in the range of 15 to 27 C (60 to 80 F). 5.1.5 The engine does not have
26、 to operate unless otherwise noted. 5.1.6 Components may be lubricated at time of initial assembly if specified on production assembly specification. After tests have started, lubrication of any component of the throttle control system, other than components which receive lubrication during normal o
27、perations or which are specified in vehicle service instructions, shall not be allowed.5.1.7 Tests shall be run in the following sequence. 5.2 System High-Temperature Test 5.2.1 Scope To determine the effect of elevated temperature and wear on operation of the throttle control system. 5.2.2 Test Pro
28、cedure 5.2.2.1 Conduct the test at a temperature of 49 C (120 F) minimum. If, however, a portion of the throttle control system is exposed to a higher temperature in service, then at least this portion of the throttle control system shall be tested at this higher temperature. (Refer to 5.2.2.2.) 5.2
29、.2.2 Determine the maximum temperature to which the throttle control system is exposed when the snowmobile has operated for a minimum of 30 min under load at an ambient temperature of at least 10 C (50 F), and use this temperature to conduct test 5.2.2.3. If a minimum ambient of 10 C (50 F) cannot b
30、e obtained, subtract the ambient temperature from 10 C (50 F), and add this difference to the maximum under hood temperature to which the throttle control system is exposed. Use this temperature to conduct test 5.2.2.3. 5.2.2.3 Subject to 5.2.3; cycle the throttle control system through design opera
31、ting range (idle to full speed) at a rate not to exceed 60 cycles per min for 300 000 cycles minimum. 5.2.2.4 Subject to 5.2.3; the throttle control system shall be subjected to strength test 5.4 while remaining at temperature, per 5.2.2.1 or 5.2.2.2. 5.2.3 Test Acceptance The throttle control syste
32、m, when released from any position, shall return to idle position within 1 s. SAE J92 Revised AUG2010 Page 5 of 55.3 System Low Temperature Tests 5.3.1 Scope To determine the effect of high relative humidity and subzero temperatures on throttle control system operation. 5.3.2 Test Procedure 5.3.2.1
33、The throttle control system shall be exposed to a temperature of 40 C 3 C (40 F 5 F) for a minimum of 2 h and then exposed to a relative humidity of 60 to 85% at room temperature for a period of 30 min 10 min, after which the system shall be exposed again to a temperature of 40 C 3 C (40 F 5 F) for
34、a period of 4 h 30 min. 5.3.2.2 Subject to 5.3.3; after conditioning per 5.3.2.1, the throttle control, while still at 40 C 3 C (40 F 5 F) isto be moved from idle to full open position and released allowing the control system to return to its idle position. Actuation of control shall be repeated at
35、least five times within 60 s. 5.3.2.3 Subject to 5.2.3; the throttle control system shall be subjected to strength test 5.4 while remaining at a temperature of 40 C 3 C (40 F 5 F). 5.3.3 Test Acceptance The throttle control system, when released from any position, shall return to its idle position w
36、ithin 1 s. 5.4 Strength Test 5.4.1 Scope To determine the adequacy of the system to withstand forces which may be imposed by the operator. 5.4.2 Maladjustment Test The throttle control or twist grip type control shall be maladjusted a minimum of 6.3 mm (1/4 in) away from its high speed stop or abutm
37、ent. A minimum force of 222.4 N (50 lb) shall be applied 12.7 mm (1/2 in) from the end of the throttle control lever or if a twist grip control is used, a torque load to the grip of 333.6 N (75 lb) times the diameter of grip in inches. Force shall be applied to the throttle control or twist grip the
38、 control at its full speed position and with the control linkagemovement limited at the speed controller. 5.4.3 Test Acceptance The control system shall remain fully functional, and when the throttle control is released from its full speed position the system shall return to the idle position within
39、 1 s. 6. NOTES 6.1 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
