This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Estimation of Pushrod Stroke in an Air Brake System with Parametric Uncertainty
Technical Paper
2011-01-0751
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In this paper, we consider the problem of designing an algorithm for estimating the stroke of a pushrod in the presence of uncertainty in the area of the treadle valve. The stroke of pushrod directly relates to the braking force available at the wheels and also affects the response time. The longer the stroke, the volume available for expansion is larger and correspondingly, the response is slower. The stroke depends on the clearance between the brake pad and the drum, which can vary due to variety of factors such as thermal expansion of drum and mechanical wear. Typical safety inspections of air brakes include the measurement of the stroke of the pushrod of each brake chamber. Regulations on trucks such Federal Motor Vehicle Safety Standard (FMVSS) 121 require the inspection to be carried out at 90 psi supply pressure and at full brake application. The evolution of the brake pressure depends on the stroke of the pushrod and the area of the treadle valve, which is controlled by the driver. The treadle valve meters compressed air from the supply reservoir to the brake chamber. The proposed scheme requires the measurement of pressure and a model for predicting the evolution of brake chamber pressure in response to full application of the brake (brake pedal is fully depressed). We assume that the area of treadle valve opening is a constant but not exactly known. We experimentally corroborate the effectiveness of the proposed algorithm. We anticipate that the proposed algorithm can be implemented in a hand-held diagnosis tool for an air brake system
Authors
Topic
Citation
Dhar, S., darbha, S., and Rajagopal, K., "Estimation of Pushrod Stroke in an Air Brake System with Parametric Uncertainty," SAE Technical Paper 2011-01-0751, 2011, https://doi.org/10.4271/2011-01-0751.Also In
References
- Middleton, D. Rowe, J. “Feasibility of standardized diagnostic device for maintenance and inspection of commercial motor vehicles,” Transportation Research Record 1560 48 56 1996
- “Air brake system,” National Highway Traffic Safety Administration, U.S. Department of Transportation
- Scheibe, R.R. Reinhall, P.G. “Safety Monitoring of Air Brake Systems On Board Commercial Vehicles,” Transportation Research Record 1560 40 47 1996
- “Bendix E-7 Dual Brake Valve,” Bendix Commercial Vehicle Systems Document no. SD-03-818 2009
- Subramanian, S.C. Darbha, S. Rajagopal, K. R. “A Diagnostic System for Air Brakes in Commercial Vehicles,” IEEE Transactions on Intelligent Transportation Systems 7 370 376 2006
- Srivatsan, R. Dhar, S. Darbha, S. Rajagopal, K.R. “Development of a model for an air brake system with leaks,” the Proceedings of the American Control Conference 1134 1139 2009
- Subramanian, S.C. Darbha, S. Rajagopal, K.R. “Modeling the pneumatic subsystem of an S-cam air brake system,” ASME Journal of Dynamics, Systems, Measurement and Control 126 36 46 2004
- Subramanian, S.C. “A diagnostic system for air brakes in commercial vehicles,” Ph.D. dissertation Texas A&M University College Station, TX 2006
- Sastry, S. “Nonlinear Systems: analysis, stability and control,” Springer-Verlag New York 1999
- Khalil, H.K. “Nonlinear Systems,” 3rd Prentice Hall New Jersey 2002
- Sastry, S. Isidori, A. “Adaptive Control of Linearizable Systems,” IEEE Transactions on Automatic Control 34 1123 1131 1989