Fault Feature Extraction of Relay Valve Leakage Based on Test for Standard EMU Brake System

Abstract

In order to excavate the leakage fault of the relay valve for the standard EMU brake system, a test using the fault injection method is carried out in this paper. By processing the pressure data collected by the pressure sensor, the BC steady-state pressure of the brake hold phase, determined as leakage fault feature, under the normal and leaking conditions is extracted and analyzed. The test results show that the BC steady-state pressure of the brake hold phase is the effective feature of the leakage fault of the relay valve, which provides a feasible way for the mining of the relay valve leakage fault.