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为提高转向工况下四轮驱动汽车的行驶稳定性,分析了轴间和轮间扭矩分配特性,建立了四轮驱动汽车动力学模型,研究了驱动力分配对车辆转向行驶稳定性的影响,提出了基于横摆力矩的驱动力矩分配控制策略,并在单移线工况下进行控制性能仿真分析。结果表明:采用提出的驱动力矩分配控制策略,能根据车辆的行驶状态主动地分配后轴左、右轮的驱动力,有效抑制车辆过多转向和不足转向趋势,提高整车的转向性能和侧向稳定性。
In order to improve the driving stability of four-wheel drive vehicles under steering conditions, the torque distribution characteristics between shafts and between wheels were analyzed. The dynamic model of four-wheel drive vehicle was established and the influence of driving force distribution on the steering stability was studied. The control strategy of driving torque distribution based on yaw moment is proposed and the control performance simulation is carried out under the condition of single line. The results show that the proposed driving torque distribution control strategy can actively distribute the driving force of the left and right rear wheel axles according to the driving conditions of the vehicle, effectively restrain the over-steering and understeering tendency of the vehicle, improve the steering performance of the vehicle and To stability.