Poppet-type brake pressure control valve for the hydraulic brake system of railway rolling stock

Abstract

In this study, a novel hydraulic brake system is proposed in order to increase the reliability of railway brake systems. The hydraulic brake system has not been used as a practical railway brake system until now because the brake pressure control (BPC) valve inherently has internal leakage, which causes an insufficient fail-safe function. Accordingly, the development of an hydraulic BPC valve is focused on in this paper. By adopting poppet elements in the valve, it is possible to maintain the braking force without internal leakage, even when the electric power supply fails. The developed BPC valve includes a built-in pressure feedback mechanism that enables the pressure control function to be maintained when the pressure transducer is broken. The operating principle and wear compensation methods for poppet elements are also examined in this paper. Moreover, a simplified transfer function and a non-linear model are developed to design and analyse the behaviour of the BPC valve. The experimental results verify the linearity of static behaviour, the stability and the performance of the valve to maintain the output pressure. In the final stage, the performance of a practical system using this valve is confirmed with the actual brake device of the Shinkansen railway.

Keywords

railway hydraulic brake pressure control poppet valve servomechanism

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