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Appl. Sci. 2017, 7(9), 941;

A New Method for Analysing the Pressure Response Delay in a Pneumatic Brake System Caused by the Influence of Transmission Pipes

School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China
Laboratory for FIRST, Tokyo Institute of Technology, Yokohama 226-8503, Japan
Author to whom correspondence should be addressed.
Received: 29 July 2017 / Revised: 2 September 2017 / Accepted: 9 September 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Power Transmission and Control in Power and Vehicle Machineries)
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This study aims to propose an analysis method for resolving the pressure response of a pneumatic brake circuit considering the effect of a transmission pipe. Pneumatic brake systems (PBS) are widely used in commercial vehicles. The pressure response characteristic of the PBS is the key factor affecting braking performance. By using the thermodynamics of a variable-quality system, the pressure response model of the brake chamber is established, which includes the dynamic model of the pipe considering the unsteady friction and heat transfer. The partial-differential control equations of pipe are solved by introducing the constrained interpolation profile (CIP) method, and a virtual chamber model is proposed to set the boundary condition so as to solve the pressure response in the brake chamber simultaneously. Thus, the regularity of the brake pressure response is obtained by considering the influence of the pipe. Lastly, the model is verified experimentally. The present study indicates that the main factors that affect the pressure response delay are the pipe length and the combination forms of the sonic conductances of the orifices inlet and outlet. Furthermore, it helps to verify that the CIP method is an effective way of solving the pressure response of a brake circuit because of its high accuracy. The present study serves as a foundation for the design and analysis of a PBS. View Full-Text
Keywords: pneumatic brake; pressure response; pipeline; brake chamber; CIP method pneumatic brake; pressure response; pipeline; brake chamber; CIP method

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Yang, F.; Li, G.; Hua, J.; Li, X.; Kagawa, T. A New Method for Analysing the Pressure Response Delay in a Pneumatic Brake System Caused by the Influence of Transmission Pipes. Appl. Sci. 2017, 7, 941.

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