A Prototype Computer-Based Test System to Test Commercial Vehicle Air Brake Systems: Application and Test Results

Document Number: 1999-01-3782

Date Published: November 1999

Author(s):
Craig Robertson - Ruhl & Associates-Forsenic Inc.
Roland L. Ruhl - University of Illinois at Urbana Chmpaign
Philip J. Smith - Ruhl & Associates-Forsenic Inc.

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\sR. 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.

File Size: 914K
Product Status: In Stock

See other papers presented at International Truck & Bus Meeting & Exposition, November 1999, Detroit, MI, USA, Session: Heavy Vehicle Simulation Capabilities

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