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为了降低高速行驶车辆爆胎带来的危险,分析了车辆在直线行驶中,转向轮胎爆胎后驾驶人的反应操作,结合转向系统的力学模型以及爆胎后轮胎的力学特性变化,研究了在轮胎纵向力作用下主销偏距上的转向力矩受力特性。根据整车动力学模型及爆胎轮心在垂直方向的位移突变,建立了爆胎车辆垂直载荷的运动学方程。通过仿真分析得到了各轮胎垂直载荷以及车辆转向系统的瞬态响应。结果表明:驾驶人采取制动减速的方式来控制爆胎车辆的车速,有可能造成转向盘产生瞬时逆转力矩,如驾驶人无法作出即时反应,车辆偏航将不可避免。
In order to reduce the danger caused by flat tire running at high speed, the reaction operation of the driver after turning to the flat tire is analyzed. The mechanical model of the steering system and the change of the mechanical characteristics of the tire after the flat tire are analyzed. Torsional moment stress characteristics of kingpin offset distance under the effect of longitudinal force of tire. According to the vehicle dynamics model and the vertical displacement displacement of the punctured wheel center, a kinematic equation of the vertical load of the punctured vehicle is established. Through the simulation analysis, the vertical load of each tire and the transient response of the vehicle steering system are obtained. The results show that when the driver adopts the method of braking and deceleration to control the speed of a punctured vehicle, it may cause instantaneous reversal torque of the steering wheel. If the driver can not make an immediate response, the vehicle yawing will be inevitable.