汽车主动悬架控制策略研究及分析

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In order to improve the car ride com- fort and safety, vehicle the active suspension sys-tem. According to automobile suspended frame structure, the establishment of a two degree of freedom 1/4 body active suspension model. Because of fuzzy control has the modeling simple, high con-trol precision,nonlinear adaptability etc, and in the vehicle active suspension control strategy has been the widespread application. Because of its structure with PID controller set flexible, parameter setting convenience, the model error robustness etc. Will their combination, this paper put forward a new control strategy. Design the velocity and accelera-tion in the body for the input of fuzzy PID control- ler, realizing the active suspension control. At the same time, using Matlab/Simulink MA computer simulation was conducted to improve the purpose of vehicle vertical vibration reduction. The simula-tion results show that the designed by fuzzy con- trol strategy of active suspension system, obviously improving the vehicle ride comfort and safety.为了提高汽车的乘坐舒适性和安全性，车辆采用主动悬架系统。根据汽车悬架的结构，建立了二自由度1／4车体主动悬架模型。由于模糊控制具有建模简单、控制精度高和非线性适应性强等优点，在车辆主动悬架控制策略中得到了较广泛的应用。加上PID控制器因其结构设定灵活、参数整定方便、对模型误差具有鲁棒性等优点。将其结合提出一种新的控制策略。设计了以车身速度和加速度为输入的模糊PID控制器，实现了对主动悬架的控制。同时，使用Matlab／Simulink进行计算机仿真，达到了改善车辆垂直减振的目的。仿真结果表明，采用所设计的模糊控制策略的主动悬架系统，明显提高了车辆乘坐的舒适性和安全性。