基于模糊PID的汽车液压伺服主动悬架控制系统

Control system of vehicle hydraulic servo active suspensions based on fuzzy PID

在详细分析汽车液压主动悬架中液压伺服系统非线性特性的基础上,建立了1/4汽车悬架非线性系统数学模型.针对具有高度非线性的阀控非对称液压缸系统,设计了模糊PID控制器,使PID控制器的控制参数能随着系统运行状态的变化而自动调整.对比分析了相同路面输入激励下主动悬架与被动悬架的控制效果.仿真结果表明,与被动悬架相比,主动悬架能有效降低车身加速度和轮胎动载荷,该系统能有效改善汽车的平顺性和安全性.

The quarter-car active suspension nonlinear model is build, based on the analyses ot the hydraulic servo control system involving the nonlinear characteristics used in vehicle active suspension. According to the high nonlinear characteristics of asymmetrical cylinder controlled by symmetrical valve, the fuzzy PID controller is designed and the controller＇s parameters can he regulated with the running states of the control system. For the same road input, the controlled effect is compared between active and passive suspension. The simulation results show that the body vertical acceleration and wheel dynamic load are improved in active suspension compared with passive suspension. The ride performance and handling stability can be improved by the control system.