模糊反馈增量式比例积分微分油气悬架控制

为了提升工程车辆的行驶平稳性,以工程车辆油气悬架为研究对象,以车身加速度为主要优化目标,设计了基于模糊反馈的增量式PID油气悬架控制系统。对被动悬架,增量式PID和模糊反馈增量式PID控制器进行仿真,对车身垂向加速度,车轮动载荷,悬架动挠度和控制力四个指标进行分析。选取C级路面和车辆行驶速度作为油气悬架系统输入激励,在降低车身垂直加速度的前提下,着重解决增量式PID控制器存在的问题。仿真结果表明,与传统被动悬架系统相比,基于模糊反馈的增量式PID控制油气悬架系统的车身垂向加速度的均方根值降低52%、悬架动挠度降低24%、车轮动载荷降低了44%。与增量式PID相比,悬架动挠度降低了69%,且基于模糊反馈的增量式PID控制器相比较于传统增量式PID控制器其输出控制力降低了86%。因此可以证明,基于模糊反馈的增量式PID控制器,不仅可以提升油气悬架系统综合动态性能,对改善车辆行驶的平顺性和操作稳定性,具有较好的应用前景,且其在经济性和环保性方面同样更具优势。

Research on Incremental PID Hydro Pneumatic Suspension Control Strategy Based on Fuzzy Dynamic Output Feedback

In order to improve the driving stability of engineering vehicles, taking the hydro pneumatic suspension of engineering vehicles as the research object and the body acceleration as the main optimization objective, an incremental PID hydro pneumatic suspension control system based on fuzzy feedback is designed. The passive suspension, incremental PID controller and fuzzy feedback incremental PID controller are simulated. The vertical acceleration of vehicle body, dynamic load of wheel, dynamic deflection of suspension and control force are analyzed. The C-class road and vehicle speed are selected as the input excitation of hydro pneumatic suspension system. On the premise of reducing the vertical acceleration of vehicle body, the problems of incremental PID controller are solved. The simulation results show that compared with the traditional passive suspension system, the root mean square value of the vertical acceleration of the vehicle body, the dynamic deflection of the suspension and the dynamic load of the wheel of the hydro pneumatic suspension system based on the incremental PID control with fuzzy feedback are reduced by 52%, 24% and 44% respectively. Compared with the incremental PID controller, the dynamic deflection of the suspension is reduced by 69%, and the output control force of the incremental PID controller based on fuzzy feedback is reduced by 86% compared with the traditional incremental PID controller. Therefore, it can be proved that the incremental PID controller based on fuzzy feedback can not only improve the comprehensive dynamic performance of hydro pneumatic suspension system, but also improve the ride comfort and operation stability of vehicle. It has a good application prospect, and it also has more advantages in economy and environmental protection.