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Understanding the Portable Roller Brake Dynamometer
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English
Abstract
Of the several types of performance-based brake testers (PBBTs), roller dynamometers (RDs) have been used for more than 20 years in Europe to judge the braking capabilities of commercial vehicles and for enforcement of minimum brake performance requirements. These RDs, however, have been exclusively of the in-ground design. In recent years, both in Australia as well as in the United States, the use of portable RDs for assessing commercial vehicle braking performance has been increasing. This paper describes some of the differences between the two types of RDs. Analyses of the effect of the roll geometry and coefficient of friction on maximum brake force measurements are made. It is concluded that careful considerations must be taken with the use of such measurements for predicting stopping distance and braking stability using the results from both in-ground as well as portable RDs. Recommendations are made based on the results of the analyses.
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Citation
Shaffer, S. and Kannel, J., "Understanding the Portable Roller Brake Dynamometer," SAE Technical Paper 982829, 1998, https://doi.org/10.4271/982829.Also In
References
- Shaffer S. J. Gaydos P. A. “Development, Evaluation and Application of Performance-Based Brake Testing Technologies” FHWA April 1998
- Shaffer S. J. Alexander G. H. “Evaluation of Performance-Based Brake Testing Technologies” Interim Report, FHWA-MC-96-004 December 1995
- Federal Motor Carrier Safety Regulations, 393.52, United States Code of Federal Regulations, CFR Title 49, Part 393, Section 52 October 1 1997
- United States Code of Federal Regulations, CFR Title 49, Part 571, Section 121
- Shaffer S. J. Christiaen A.-C. “Judging the Stopping Capability of Commercial Vehicles using the Results of a Performance-Based Brake Force Measurement” SAE Paper 982830 Society of Automotive Engineers Warrendale, PA November 1998
- Radlinski R. W. Flick M. A. Clark G. S. “Enhancing the Roller Brake Tester” SAE Paper 922444 Society of Automotive Engineers Warrendale, PA 1992
- Robert Bosch GmbH “Automotive Brake Systems” SAE 188 189 1995
- Shaffer S. J. Alexander G. H. “Commercial Vehicles Brake Testing - Part 2: Preliminary Results of Performance-Based Test Program” SAE Paper 952762 Society of Automotive Engineers Warrendale, PA 1995