建立侧向风作用下的汽车整车横向和垂向非线性动力学模型。考虑到随机路面输入和侧向风干扰,利用L2增益干扰抑制的方法设计出电动助力转向(EPS)与主动悬架系统(ASS)的非线性输出反馈H∞控制器。在Matlab环境下对驾驶员——汽车——道路闭环系统进行仿真计算。结果表明,所设计的控制器能有效抑制路面随机输入和较大的侧向风干扰,改善车辆的操纵稳定性、转向轻便性和行驶平顺性。
A vehicle nonlinear lateral and vertical dynamics model is built under crosswind disturbance. With the L2-gain method of disturbance suppression, the nonlinear H∞ output feedback controller is designed for electrical power steering (EPS) and active suspension system (ASS) with considerations of random road input and strong crosswind disturbance. Simulations for driver-vehicle-road closed-loop system are carried out by using Matlab software. The results show that the designed controller can suppress the disturbances effectively and improve handling stability, handiness and ride characteristics of a vehicle.