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对前后轮转向比为定值和实现最优控制的两种四轮转向车辆的操纵稳定性进行了仿真对比分析。在建立四轮转向车辆操纵动力学模型的基础上,对四轮转向车辆的动力学响应进行仿真,并将仿真结果与前轮转向车辆做比较。仿真结果表明:两种四轮转向车辆在中高速行驶时均显著提高了车辆的操纵稳定性,但前后轮转向比为定值的四轮转向车辆会加重驾驶员负担,而最优控制四轮转向车辆会使驾驶员保持原来的转向感觉。
The steering stability of two kinds of four-wheel steering vehicles with front-rear wheel steering ratio as the fixed value and optimal control was simulated and compared. Based on the establishment of steering dynamics model of four-wheel steering vehicle, the dynamic response of the four-wheel steering vehicle is simulated and the simulation results are compared with that of the front steering vehicle. The simulation results show that both four-wheel steering vehicles significantly improve the handling stability of the vehicle at medium speed and high speed, but the four-wheel steering vehicles with the front and rear wheel steering ratios as fixed values increase driver’s burden, while the optimal control four-wheel Steering the vehicle will keep the driver in the original steering feel.