Study on the Online Performance Evaluation Method for Relay Valve of EMU
To evaluate in real time the performance of relay valve and discover and treat the deterioration or abnormality of its performance in time,this article proposes an online performance evaluation method for relay valve of EMU.A discrete model for the relay valve in the whole range of pressure variation under different conditions is established in the electronic brake control unit;the model parameters such as pressure difference,time ratio and number of pressure fluctuations are updated in real time during the operation of EMU and the dynamic indices necessary for the performance evaluation are obtained;the static indices for performance evaluation are extracted according to the pressure input-output relation reflected by the model;a multilevel architecture for performance evaluation is established to conduct the online performance evaluation of relay valve from different levels based on the static and dynamic indices and the data of faults related to the relay valve in service.The relay valve of"Fuxing"EMU is taken for the object of test and the evaluation method is verified on the full-scale test platform.It turns out that the online method can improve the instantaneity and the accuracy of the performance evaluation result of relay valve,that the hierarchical evaluation result can better guide the operation and maintenance and that the performance evaluation model can improve the control precision of the pressure of brake cylinder.
EMUrelay valveperformanceonline evaluationhierarchical modelpressure control
NETL
NSTL
万方数据
维普
