关于外门换端时无法保持开门的改进设计

为了提高城际动车组、地铁车辆运用的可靠性，客室车门控制继电器按在列车安全电路中。客室车门系统在电气控制方面容易发生“在断开司机室主控钥匙时，打开的列车客室车门自动关闭”的故障，对其故障原因进行了分析，提出相应的改进措施，起到了良好的效果。

Improved Design about to Keep Open Door When Changing End

In order to improve the reliability of intercity EMUs,metro vehicle use ,passenger door control relay in train safety circuit. Passenger door system in electrical control ,prone to ＇open primary key driver control,automatic closing＇fault train passenger compartment door open,the fault analysis ,put forward corresponding improvement measures,played a good effect.