车辆半主动悬架动力学分析及模糊PID控制仿真

Dynamic Analysis and Fuzzy-PID Control Simulation of Semi-active Vehicle Suspension

首先建立4自由度1/2车体动力学模型,针对车辆悬架为非线性、时滞、不确定系统,设计了半主动悬架的参数自整定模糊PID控制器,实现PID参数在线修正的功能,并以C级路面作为输入信号,运用Matlab/Simulink控制仿真软件对该半主动悬架模型各平顺性指标进行计算机仿真,结果表明,模糊PID控制的半主动悬架与被动悬架和模糊控制的半主动悬架相比在对车身垂直加速度、俯仰角加速度、悬架动挠度、轮胎动载荷等平顺性指标都有较大的改善,验证了模糊PID控制具有较好的自适应能力。

A half-vehicle 4DOF dynamic model was built up, as a non-linear, time-delay and uncertain system of vehicle suspension, the parameters of self-adjusting fuzzy PID controller of semi-active suspension was designed, which can achieve the functions of PID parameters on-line amendment, and the C-class road as an input signal. The Matlab/Simulink simulation software is used for simulating the smoothness indicators of the semi-active suspension model. The results show that the fuzzy PID control of semi-active suspension compared to passive suspension and fuzzy control of semi-active suspension, the body vertical acceleration, the body pitch angle acceleration, suspension dynamic deflection, tire dynamic load and other indicators of smoothness have greatly improved;fuzzy PID control has better adaptive ability.