汽车爆胎特性建模与主动制动控制策略

为了提高汽车在突发爆胎事故时的稳定性，对爆胎汽车主动制动控制策略进行了研究。根据车轮爆胎时间与压力变化的关系，在UniTire模型基础上建立了爆胎模型；根据电子稳定性控制系统中横摆角速度及质心侧偏角对汽车稳定性影响的关系，基于二自由度汽车动力学模型，通过计算汽车横摆角速度及质心侧偏角实际值与理想值的偏差，并基于线性二次型调节器最优控制方法决策出最优附加横摆力矩，从而修正爆胎后汽车的运动状态。最后通过计算机仿真对所提策略的有效性进行了验证。结果表明：主动制动控制策略可以保证爆胎过程中汽车的行驶稳定性和安全性。

Tire Blow-out Modelling and Active Braking Control Algorithm of Vehicle

In order to avoid serious traffic accident caused by tire blow-out,an active braking control algorithm was studied to improve vehicle stability and safety.Considering the time of blow-out and pressure change of tire,a tire blow-out model was built based on UniTire model.The effects of yaw rate and side-slip angle on vehicle electric stability control systems were referred and the two-degree of freedom vehicle dynamic reference model was built.The difference between the ideal values and the actual values of yaw rate and side-slip angle was computed and the tire blow-out vehicle motion states were modified by the optimal yaw moment which was calculated with linear quadratic regulator.The computer simulation test results show that the active braking control algorithm can improve vehicle stability and safety.