1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUW LVSXEOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJL neering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising tKHUHIURPLVWKHVROHUHVSRQVL
2、ELOLWRIWKHXVHU 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 2016 SAE International All rights reserved. No part of this publication may be reproduced, st
3、ored 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 USA) Fax: 724-776-079
4、0 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/J2688_201602 SURFACE VEHICLE RECOMMENDED PRACTICE J2688 FEB2016 Issued 2012-04 Revised 2016-02 Superseding J2688
5、APR2012 Parking Brake Control Identification - Vehicles with Hydraulic Brake Systems and Automatic Transmissions RATIONALE After the initial publication of this recommended practice there has been additional information provided to the committee that warrants a revision to the document. The addition
6、al information will enhance the accuracy of this recommended practice and changes have been made to accommodate this input. 1. SCOPE The scope and purpose of the SAE Recommended Practice is to provide standards for the control and indication of parking brakes in hydraulic braked vehicles over 4540 k
7、g (10000 lb) GVWR. This recommended practice pertains to automatic transmission applications and supplements the SAE J915 recommended practice. This recommended practice does not address parking brake system performance. Parking brake system performance, both static and dynamic conditions, is the re
8、sponsibility of the OEM vehicle manufacturer or manufacturers that modify the vehicle by adding special vocational required equipment (such as but not limited to outriggers, cranes, etc.). 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the exte
9、nt 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, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE
10、J915 Automatic Transmissions - Manual Control Sequence SAE J2208 Park Standard for Automatic Transmissions SAE INTERNATIONAL J2688 FEB2016 Page 2 of 7 2.1.2 United States Government Federal Safety Standards Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbi
11、ns Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. Motor Vehicle Safety Standard (FMVSS) No. 101 Controls and Displays Motor Vehicle Safety Standard (FMVSS) No. 102 Transmission Shift Position Sequence, Starter Interlock, and Transmission Braking Effec
12、t Motor Vehicle Safety Standard (FMVSS) No. 105 Hydraulic and Electric Brake Systems Motor Vehicle Safety Standard (FMVSS) No. 135 Light Vehicle Brake Systems 2.1.3 European Economic Community (EEC) / United Nations Economic Commission for Europe (ECE) Regulations ECE Regulations available from Unit
13、ed Nations Economic Commission for Europe, Palais des nations, CH-1211, Geneva 10 Switzerland. Tel:41-0-22-917-12-34. www.unece.org EEC Regulations available from Automotive Industry, European Commission, B-1049 Brussels Belgium, Tel: 32-2-299-96-96. www.ec.europa.eu. 78/316/EEC Interior Fittings of
14、 Motor Vehicles (identification of controls, tell-tales and indicators) 2.1.4 Government of Canada Motor Vehicle Safety Regulations Available from Transport Canada, 330 Sparks Street, Ottawa, ON K1A ON5, Tel: 613-990-2309, www.tc.gc.ca. Motor Vehicle Safety Standard (CMVSS) No. 101 Controls and Disp
15、lays 3. DEFINITIONS 3.1 TRANSMISSION PARKING PAWL A mechanical device incorporated in the transmission that when engaged locks the transmission from moving resulting in the parking function. This device functions only when the vehicle is stopped (not moving) and does not provide dynamic braking perf
16、ormance. 3.2 MECHANICAL FRICTION PARKING BRAKE $GUIULFWLRQGUXPRUGLVFEUDNHDVVHPEOFRPPRQOFDOOHGWKHSDUNLQJEUDNH WKDWLVDFWXDWHGWRSURYLGHWKHKROGLQJforces to park the vehicle. These parking brakes can be utilized to meet special requirements for dynamic (vehicle moving) vehicle braking performance. 3.3 KE
17、YPAD A keypad is a set of buttons or a pre-printed film surface arranged in a block or “pad“ which usually bear digits, symbols and alphabetical letters that represent the various transmission shift positions 3.4 SAAR Spring Applied and Air pressure Release actuator utilizing air pressure from the a
18、ir brake system or a separate compressed air pressure source on the vehicle to release the parking brake. The parking brake is applied by releasing the pressure allowing the actuator spring to apply. SAE INTERNATIONAL J2688 FEB2016 Page 3 of 7 3.5 SAHR Spring Applied and Hydraulic pressure Release a
19、ctuator utilizing hydraulic pressure from the hydraulic braking system or a separate hydraulic pressure source on the vehicle to release the parking brake. The parking brake is applied by releasing the pressure allowing the actuator spring to apply. 3.6 SAER Spring Applied and direct Electrical powe
20、r Release actuator utilizing the vehicle electrical system or a separate electrical system on the vehicle to release the parking brake. The parking brake is applied by releasing the electrical power allowing the actuator to apply. 3.7 PARKING BRAKE LEVER OR PARKING BRAKE PEDAL A hand or foot operate
21、d lever or pedal, which is located within reach of the operator, which transmits force to apply or release the parking brake. 3.8 LEVER LOCK A latch that must be released by the operator before the parking brake lever can be moved to release the parking brake application. 3.9 POWER ASSISTED PARKING
22、BRAKE Actuation of the parking brake is done with the use of an alternate source of mechanical force to apply and release the brake, such as the SAAR, SAHR, and SAER. 4. CONTROL AND INDICATION There are various types of parking brake mechanisms that are utilized on the vehicles outlined in this docu
23、ment scope. Each requires specific controls to apply and release the parking function. A transmission parking pawl and a mechanical friction parking brake should not be actuated with the same or single actuation device or method. Besides the operator not knowing which parking brake function is actua
24、lly holding the vehicle, there can be binding and brake release sequence issues with having a single parking actuation function. The following indication designations are for the parking function only. Refer to SAE J915 for indication details for the other transmission (R N D L, etc.) functions. a.
25、Automatic application and release of a transmission or axle mounted mechanical friction parking brake. i. For transmissions with a parking pawl, the designation on the transmission lever, decal or key pad shall be: P R N / 5HIHUWR6$(-IRU51/GHILQLWLRQV Note: Indication same as with manual parking bra
26、ke. Note: Application and release of park brake is not controlled by the transmission shifter (for transmissions with parking pawl).Automatic park brake application and release must be done by means other than the transmission shifter (for transmissions with a parking pawl) ii. For transmissions wit
27、hout a parking pawl, the designation on the transmission lever, decal or key pad shall be: PB R N / 5HIHUWR6$(-IRU51/GHILQLWLRQV 1RWH,QGLFDWLRQVKDOOEH3%DQGQRW3 a. 2SWLRQDOOWKH3$5.%5$.(VPERO ,62% PDEHXVHGLQVWHDGRI3%E XWWKHVPEROmust not be RED in color. iii. Automatic application occurs through the au
28、tomatic transmission control lever or key pad. iv. The transmission shifter is a secondary method to apply the parking brake. SAE INTERNATIONAL J2688 FEB2016 Page 4 of 7 b. Manual application and release of a transmission or axle mounted mechanical friction parking brake using a hand or foot operate
29、d lever. i. For transmissions without a parking pawl, the designation on the transmission control lever, decal or key pad shall be: 51/ 5HIHUWRSAE J915 for 5 1/GHILQLWLRQV) ii. For transmissions with a parking pawl, the designation on the transmission lever, decal or key pad shall be: 351/ 5HIHUWR6$
30、(-IRU51/GHILQLWLRQV iii. For a hand operated parking brake lever: 1. To apply parking brake - pull lever to its designed stroke (not all hand levers are designed to be applied at full stroke). a. Over-center levers operate at full stroke every time. b. Ratchet and pawl levers do not operate at full
31、stroke every time. 2. To release parking brake - disengage optional lever lock and push (return) lever to the released position iv. For a foot operated parking brake pedal: 1. To apply parking brake - push foot pedal towards cab floor a. Repeat pushing foot pedal as required to engage parking brake
32、2. To release parking brake push the foot pedal. c. Power assisted application and release of a transmission or axle mounted mechanical friction parking brake using a hand operated mechanical or electrical control device i. For transmissions without a parking pawl, the designation on the transmissio
33、n lever, decal or key pad shall be: 51/ 5HIHUWR6$(-IRURWKHU51/RSWLRQV ii. For transmissions with a parking pawl, the designation on the transmission lever, decal or key pad shall be:P R N / 5HIHUWR6$(-IRURWKHU51/RSWLRQV iii. Hand operated control device is used in conjunction with a mechanical sprin
34、g apply and either air pressure (SAAR), hydraulic pressure (SAHR) or direct electrical power release (SAER) systems: 1. To apply parking brake - pull device handle or button out 2. To release parking brake - push device handle or button in SAE INTERNATIONAL J2688 FEB2016 Page 5 of 7 iv. The control
35、device handle or button to be comprised of: 1. Diamond in shape 2. Yellow in color 3. Markings of a. Parking brake b. Push to release c. Pull to apply d. Optional and automatic application devices i. For specific vehicle vocational applications, the vehicle manufacturer can provide other devices or
36、systems to apply and release the parking brake (example: school bus door interlock system). 5. LOCATION OF CONTROLS Are to be located per the referenced federal and international regulations and practices. 6. CONTROL SYMBOLS Are to be as defined per the referenced federal and international regulatio
37、ns and practices, unless defined in this document. 7. ILLUMINATION AND COLOR OF TELLTALE SYMBOLS Are to be mounted as defined per the referenced federal and international regulations and practices. i. Park Brake Warning Light Telltale 1. Symbol a. If the same light is used for all brake related warn
38、ings (except ABS related warnings), the light must read %5$.( b. If a separate light is used for the pDUN EUDNH ZDUQLQJV WKH OLJKW PXVW UHDG 3$5. DV D PLQLPXP(additional words may be used). c. Park Brake Warning Light Telltale will be RED in color. 2. Function a. Illuminate as a check of lamp functi
39、on upon ignition on. b. Illuminate when ignition is on and park brake is applied. c. Optionally, Flash when ignition is on and park brake requested to be applied, but failed to apply. This is per ECE and FMVSS does not state lamp cannot flash SAE INTERNATIONAL J2688 FEB2016 Page 6 of 7 ii. Park Brak
40、e Malfunction Telltale (optional for power assist parking brake) 1. Symbol a. WKHWHOOWDOHWRUHDG6HUYLFH3%25DVPEROWKDWFRPELQHVWKH3DUN%UDNHV VWHP ,62% DQGService Wrench (ISO 2575; X07). b. Park Brake Malfunction Telltale will be YELLOW in color. 2. Function a. Illuminate as a check of lamp function upo
41、n ignition on. b. Illuminate when ignition is on and a malfunction exists with the parking brake. iii. Park Brake Forget Telltale (optional) 1. Symbol a. WKHWHOOWDOHWRUHDG$SSO3% b. Park Brake Forget Telltale will be YELLOW in color. 2. Function a. Illuminate as a check of lamp function upon ignition
42、 on. b. Illuminate when ignition is off and park brake is not applied. 8. OVER-STROKE SENSORS Optional devices to indicate parking brake service as needed. 9. OPTIONAL AUDIBLE DEVICE (BUZZER, CHIME OR EQUIVALENT DEVICE) Shall SURYLGHVXIILFLHQWOHYHORIZDUQLQJWRWKHRSHUDWRUZKHQVHDWHGLQWKHGULYHUV VHDWDVZ
43、HOODVZKHQWKHGULYHUVGRRUis open and the driver is out of the vehicle. Sequence of operation shall be: i. 2QZKHQWKHSDUNLQJEUDNHLVQRWDSSOLHGDQGWKHLJQLW ion is off. ii. 2QZKHQWKHSDUNLQJEUDNHLVDSSOLHGDQGWKHYHKLFOHLVPRYLQJ 10. OTHER TELLTALE SYMBOLS AND AUDIBLE DEVICES For SAAR, SAHR, and SAER power assis
44、t parking brake systems, appropriate telltale symbols and audible devices are recommended to indicate these system conditions. SAE INTERNATIONAL J2688 FEB2016 Page 7 of 7 11. NOTES 11.1 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
