轿车半主动悬架系统模糊控制

RESEARCH FOR VEHICLE SEMI-ACTIVE SUSPENSION SYSTEM ON FUZZY CONTROL

为了实现汽车操纵稳定性和乘坐舒适性,本文对轿车半主动悬架系统进行研究。建立了1/4轿车二自由度悬架数学模型,并推导出悬架动力学方程和状态方程。接着设计出适用于半主动悬架系统的模糊逻辑控制,将该控制策略应用到半主动悬架中,并与被动悬架的车身加速度、轮胎动载荷、悬架动挠度性能指标进行对比。仿真结果表明半主动悬架系统比传统的被动悬架具有更好的减振性能,同时说明该控制策略的可行,可以有效地提高车辆行驶的平稳性和乘坐舒适性。

In order to achieve stability and vehicle handling and ride comfort,we study the vehicle semi-active suspension system. We establish the 1/4 vehicle two degree-of-freedom suspension mathematical model and infer the suspension dynamic equation and the equation of state.Furthermore,we design the fuzzy logic control which is suitable for the semi-active suspension system and apply the control strategy in semi-active suspension system＇s control. We also compare with the passive suspension＇s performance index of automobile body acceleration,wheel relative moving load and suspension dynamic travel. The simulation indicates the semi-active suspension system has a better antivibration performance compared to the traditional passive suspension. It also shows that this control strategy is feasible and improves the vehicle stability and ride comfort obviously.