A control algorithm for WSP valves in a pneumatic brake system of a railway vehicle

摘要

In a railway vehicle, a WSP valve is a key component for the safety of the vehicle and the supplementation of brake operation in impaired track conditions. The WSP controller detects sliding of each wheelset and reduces pneumatic brake force of the sliding wheelset. Due to the working of the WSP system, the excessive sliding or a locking of wheels is prevented. On the WSP system operating, the WSP valve shall reduce an inner pressure of the brake cylinder sufficiently. But the WSP valve has its own time delay and response time because of the characteristics of the electro-magnet in the valve and air flow of a brake cylinder through pneumatic valves. Therefore it is necessary to develop a mathematical model to simulate and to improve the control algorithm of the WSP system with the valve model. In this study, the mathematical model of the WSP valve is to be built and control algorithm for WSP valve is to be introduced, and then the performance of the algorithm is to be verified through HILS for a pneumatic brake system.