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Comparison of Heavy Truck Foundation Brake Performance Measured with an Inertia Brake Dynamometer and Analyses of Brake Output Responses to Dynamic Pressure Inputs
Technical Paper
2005-01-3611
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In support of NHTSA's studies of heavy truck brake types and their effects on vehicle stopping performance and stability, the NHTSA Vehicle Research and Test Center (VRTC) has evaluated four foundation brake types on their Greening Brake Dynamometer. Several sample assemblies of each type of brake were tested to better understand variability. Braking tests were run under the “Laboratory Test Procedure for FMVSS 121D Air Brake Systems - Dynamometer” (TP- 121D-01) procedures. Afterward, the test scope was expanded to include higher speeds and higher severity conditions than those specified Test Procedure. This paper reports on the differences in braking effectiveness between two traditional S-Cam air brake types and two recently introduced Air Disc brake types. Burnish procedure trends are briefly discussed and compared. Responses of the pneumatic brakes to both constant-pressure and dynamic inputs are also compared and discussed. New statistical methods are introduced to compare brake effectiveness over a broad range of pressures.
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Citation
Hoover, R. and Zagorski, S., "Comparison of Heavy Truck Foundation Brake Performance Measured with an Inertia Brake Dynamometer and Analyses of Brake Output Responses to Dynamic Pressure Inputs," SAE Technical Paper 2005-01-3611, 2005, https://doi.org/10.4271/2005-01-3611.Also In
New Concepts in Commercial Vehicle Suspensions, Advancements in Braking, Steering, and Stability and Handling Simulation
Number: SP-1984; Published: 2005-11-01
Number: SP-1984; Published: 2005-11-01
References
- “Class 8 Truck Tractor Braking Performance Improvement Study; Report 1; Straight Line Stopping Performance on a High Coefficient of Friction Surface,” NHTSA research report DOT HS 809 700 Dunn Ashley L. (Al) Hoover Richard L (Dick) TRC, Inc. June 2004
- “The Effects of Foundation Brakes on Class-8 Tractor Dry Stopping Performance,” SAE paper 2004-01-2701 Dunn Ashley L. (Al) Hoover Richard L. Zagorski Scott B.
- The Effects of Foundation Brake Configuration on Class-8 Tractor Wet Stopping Performance and Stability,” SAE paper 2004-01-2702 Dunn Ashley L. (Al) Hoover Richard L. Zagorski Scott B.
- U.S. D.O.T. National Highway Traffic Safety Administration, Laboratory Test Procedure for FMVSS 121-D, Air Brake Systems - Dynamometer, TP121D-01 May 9 1990
- “S-Cam Brake Effectiveness Comparison using Two Fixtures and Two Lining Types on a Single Inertia Dynamometer,” NHTSA research report DOT HS 809 162 Hoover Richard L (Dick) Howe J. Gavin Flick Mark A. Dashner David A. TRC, Inc. September 2000
- U.S. D.O.T. National Highway Traffic Safety Administration FMVSS 121, Air Brake Systems, 49 CFR, Ch. V (10-1-03 edition)