城市轨道交通制动控制装置压力控制方法研究

Pressure Control Method for Urban Rail Transit Brake Control Devices

[目的]压力控制作为城市轨道交通制动控制装置的核心功能,其结构原理设计对于制动控制系统有着至关重要的作用。高频开关电磁阀压力控制方法作为主流的控制方式,研究其结构特性对于提升制动控制装置的可靠性尤为重要。[方法]通过分析电磁阀不同的布局方式,提炼串联排气型、串联保压型、并联排气型、并联保压型、并联充气型等5种高频开关电磁阀压力控制方法的基本结构,结合其故障模式总结其特性及适用场景。[结果及结论]依据T/CAMET 04004.4—2018《城市轨道交通车辆制动系统第4部分:制动控制单元技术规范》:排气型压力控制结构适用于常用制动气路,保压及充气型压力控制结构适用于紧急制动气路;串联式压力控制结构的保持输出压力稳定性能优于并联式压力控制结构,并联式压力控制结构的充气速率优于串联式压力控制结构。制动控制装置压力控制结构设计时应综合考虑目标压力的控制精度、充排气速率需求及电磁阀控制策略等因素,合理配置腔室容积及管路通径。

[Objective]As the core function of urban rail transit brake control devices,the structural principle design of pressure control is crucial for the brake control system.High-frequency switching solenoid valve pressure control method is the mainstream control approach,studying its structural characteristics is particularly important for enhancing the reliability of brake control devices.[Method]By analyzing different configurations of solenoid valves,the basic structures of five high-frequency switching solenoid valve pressure control methods are identified,including series exhaust,series pressure-holding,parallel exhaust,parallel pressure-holding,and parallel inflation.Their characteristics and applicable scenarios based on their failure modes are summarized.[Result&Conclusion]According to T/CAMET 04004.4—2018′Brake systems of urban rail vehicles Part 4:Technical specification of brake control units′,the exhaust-type pressure control structure is suitable for normal braking air circuits,while pressure-holding and inflation-type pressure control structures are suitable for emergency braking air circuits.The series pressure control structure maintains output pressure stability better than the parallel pressure control structure does,whereas the parallel pressure control structure has a faster inflation rate compared to the series pressure control structure.When designing the pressure control structure of brake control devices,it is essential to comprehensively consider factors such as the target pressure control accuracy,inflation and exhaust rate requirements,and solenoid valve control strategies,and to configure the chamber volume and pipeline diameter appropriately.