四轮转向车辆转向特性分析及试验研究

为了深入研究四轮转向车辆的操纵稳定性,运用自动控制理论对采用质心零侧偏角控制策略的四轮转向车辆的转向特性进行了计算机仿真研究.主要就车速、轮胎侧偏刚度、整车质量、重心位置等因素对整车操纵稳定性的影响趋势进行了分析.同时对四轮转向样车的研制进行了说明,并将其用于仿真及试验.仿真和试验结果表明,相对于前轮转向车辆,高速时四轮转向车辆总体上有利于操纵稳定性,但不同因素的变化也会导致出现一些不利于操纵稳定性的趋势.

Steering Characteristics of Four-Wheel-Steering Vehicle and Relevant Tests

To attain a study in some depth for the stability of control in four-wheel-steering of vehicles the steering characteristics of a four-wheel-steering vehicle is numerically simulated in the light of automatic control where the object of control in four-wheel-steering is the zero side-slip angle of the center of gravity of the vehicle under consideration. Computer simulation of influences of vehicle speed, cornering stiffness of tire, mass of the whole vehicle and position of the gravity center upon the steering stability is carried out. The four-wheel-steering prototype vehicle is described and used in validation test. The research results show that the four-wheel-steering is of benefit to the steering stability of high speed vehicle on the whole, yet attention must be paid to the deteriorating tendencies caused by changes in some factors.