气制动ABS电磁阀压力动态特性研究

Study on Dynamic Characteristics of Braking Pressure in Pneumatic ABS Solenoid Valve

为了解决ABS气动系统建模过程中采用一、二阶系统模型所出现的压力估计不精确和电磁阀动态特性过于简化等问题,基于某客车压力调节器,设计了ABS气压系统试验平台。通过改变电磁阀的控制信号对制动气室入口处的压力动态特性进行了测试分析;采用回归分析的方法对压力特性曲线进行了参数辨识;综合考虑气室初始压力、电磁阀开关滞后等影响因素建立了气压电磁阀的压力特性等效模型并进行了验证。试验与仿真结果吻合,表明所建立的模型和测试系统是有效的。

In order to solve the inaccurate estimate of the pressure and oversimplification of the dynamic characteristics of solenoid valve by using the first - or the second-order model during the modeling process of Pneumatic ABS ,a pressure model of valve ,which considered factors such as initial pressure in the air chamber and switch lag, was established based on the specific pressure regulator. The test-bed of hardware in-loop simulation of Pneumatic-ABS was built up. Model parameters are calculated by regression analysis according the pressure which was measured in the entrance of brake Air chamber by changing the control signal. The agreement between the simulation results and the experimental data proved the effectiveness of identification and the testing system.