电磁开关阀式液力缓速器特性研究

Study on characteristics of electromagnetic on-off valve hydraulic retarder

为减少汽车刹车时液力缓速器工作响应时间,提高液力缓速器系统的制动特性,文章采用电磁开关阀代替比例压力阀控制液力缓速器的方式,对电磁开关阀本体与液力缓速器的控制策略进行联合仿真,并通过实验验证该控制方式,让液力缓速器更快速的响应。对比比例压力阀的实验数据进行分析,结果表明,使用电磁开关阀代替比例压力阀控制液力缓速器,加入比例积分微分(proportional integral derivative,PID)和窗数的控制手段,在超调量可被接受的范围内,极大缩短液力缓速器的响应时间,实现了液力缓速器响应的快速性,并为车辆提供稳定的制动力矩,实现对液力缓速器各个挡位的稳定控制。

In order to reduce the response time of the hydraulic retarder during car braking and improve the braking characteristics of the hydraulic retarder system,this paper uses an electromagnetic on-off valve instead of a proportional pressure valve to control the hydraulic retarder.The control strategy for the electromagnetic on-off valve and the hydraulic retarder is jointly simulated,and the effectiveness of this control method is verified through experiments to achieve faster response for the hydraulic retarder.The experimental data are compared with those of the proportional pressure valve,and the results show that using an electromagnetic on-off valve to control the hydraulic retarder,along with the proportional integral derivative(PID)control and windowed control,significantly shortens the response time of the hydraulic retarder within an acceptable overshoot range.This approach accelerates the response of the hydraulic retarder,provides stable braking torque for vehicles,and achieves stable control of the different gears of the hydraulic retarder.