动车组中继阀性能在线评估方法研究

Study on the Online Performance Evaluation Method for Relay Valve of EMU

为实时评估中继阀性能并在发现其性能衰退或异常时及时作出处理,文章提出了一种动车组中继阀性能在线评估方法。在电子制动控制单元内建立了中继阀在不同工况下全部压力变换区间的离散模型;在动车组运行过程中对压力差、时间比、压力波动次数等模型参数进行了实时更新并获取了性能评估所需的动态指标;根据模型反映的压力输入输出关系提取了性能评估的静态指标;建立了性能评估的多层级架构,基于静态和动态指标及运行中的中继阀相关故障数据对其性能进行了不同层次的在线评估。以复兴号动车组中继阀为试验对象,在实物测试平台中对此评估方法进行了验证,结果表明,在线评估方法提高了中继阀性能评估结果的实时性和准确性,层次化的评估结果对运用检修具有更好的指导作用,性能评估模型还能够提升制动缸压力的控制精度。

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.