This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Prototype Computer Based Test System to Test Commercial Vehicle Air Brake Systems: Application and Test Results
Technical Paper
1999-01-3782
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes a practical and efficient approach for determining complete transient, as well as steady state response of tractor-trailer air brake systems by recording pushrod displacement and air brake service line pressure as a function to time. The test hardware utilizes easy to fabricate “clip on” transducers to measure pushrod stroke length. Data acquisition is via LABVIEW‚. All transducers are easy to temporarily affix to any tractor- trailer and require no alteration to the vehicle. A complete system check takes less time than manually measuring pushrod stroke as required under FMCSA. This system with one treadle application and release gives digital timing and displacement history of all brakes. Useful information includes: application and release profiles (pushrod velocity), shoe compliance upon seating and crack pressure release points for both tractor and trailer relay valves. The authors believe this testing protocol will be useful to Fleet Managers and Maintenance Personnel, Law Enforcement specializing in Commercial Vehicle Inspection and Accident Investigators who need information on brake system performance.
Recommended Content
Technical Paper | Truck Disc Brakes-Practice Makes Perfect |
Technical Paper | Development challenges of hydraulic brakes for commercial vehicles |
Technical Paper | Brake Testing and Lining Evaluation of Large Off-Highway Mining Trucks |
Authors
Topic
Citation
Robertson, C., Smith, P., and Ruhl, R., "A Prototype Computer Based Test System to Test Commercial Vehicle Air Brake Systems: Application and Test Results," SAE Technical Paper 1999-01-3782, 1999, https://doi.org/10.4271/1999-01-3782.Also In
References
- James William. Fitch Motor Truck Engineering Handbook 4th Edition Society of Automotive Engineers 1994
- Flick, Mark A. The Effect of Brake Adjustment on Braking Performance Accident Reconstruction Journal July/August 1991
- Heusser, Ronald B. Heavy Truck Deceleration Rates as a Function of Brake Adjustment. SAE Technical Paper 910126 . (Revised) 1991
- Commercial Driver’s License Study Guide State of Illinois 1995
- Sealco Air Controls, Inc Stopping Distance Chart for Air Brake Equipment (PRE-121)
- Radlinski, Richard W. Braking Performance of Heavy U.S. Vehicles SAE Technical Paper 870492 1987
- Limpert Rudolf Andrews D. F. Analysis of Truck Braking Accidents SAE Technical Paper 87504 1987
- U.S. Department of Transportation Federal Highway Administration Federal Motor Carrier Safety Regulations 382, 383, 387, 390-399. 49
- NTSB. Safety Study-Heavy Vehicle Airbrake Performance. NTSB 1992