气压式电子驻车制动系统控制电磁阀的匹配研究

Solenoid Valve Match for Pneumatic Electronic Parking Brake System

针对气压式电子驻车制动系统中的电磁阀匹配问题,对改进设计的直动式两位两通电磁阀,以及常见的微型电磁阀、分步直动式电磁阀进行研究。首先对气压式电子驻车制动系统展开了研究,然后依据系统方案设计搭建气压式电子驻车制动系统的阀类试验台,对三种电磁阀进行静、动态特性试验研究;并对不同控制频率和占空比下的系统压力响应特性进行了研究。试验结果证明改进设计后的直动式两位两通电磁阀对于气压式电子驻车制动系统具有优于其余两种阀的匹配性。最后,对该直动式两位两通阀开关动作下系统的压力滞后特性进行研究,得到电磁阀的通电时间至少应大于开启滞后时间20ms,电磁阀的断电时间至少要大于关闭滞后时间24 ms。

Considering solenoid valve match for pneumatic Electronic Parking Brake system,the micro solenoid valves,redesign direct-acting 2 /2 way solenoid valves and multiple step direct-action solenoid valve were studied.First of all,based on the pneumatic Electronic Parking Brake system was analyzed. In addition,solenoid valve test bench was builded according to system design and tests static and dynamic characteristics of the three kinds of solenoid valve applying it. The research is done on the system response under different frequency and duty cycle control. It is suggested that the redesign direct-acting 2 /2 way solenoid valves is superior to the other solenoid valve for pneumatic Electronic Parking Brake system. Through experiments of system pressure hysteresis characteristic of the redesign direct-acting 2 /2 way solenoid valves when it is on and off,it is found that the opening time of the valve is at least 20 ms and turn-off time is at least 24 ms in order to control the breaking force precisely.