汽车爆胎附加横摆力矩模型研究

Research on Estimated Calculation Model of Additional Yaw Torque after Vehicle Tire Blow-out

在对爆胎车辆动力学特性进行分析的基础上,建立了爆胎车辆产生附加横摆力矩预估计算模型,并结合车辆电控液压制动系统中进液电磁阀开启时间与制动轮缸压力的相关特性,把附加横摆力矩预估值转化为制动轮缸增压时间,以直接控制车辆各轮缸增压时间来实现差动制动,从而产生相应的抗爆胎附加横摆力矩以平衡车辆。设计了相关试验系统,试验结果表明,该预估计算模型基本可以近似计算车辆爆胎后所需的抗爆胎横摆力矩,为提高汽车爆胎应急自动制动系统响应能力,进一步精准控制爆胎车辆运动轨迹提供了先行条件。

Based on the dynamics analysis of tire blow-out vehicle, an estimated calculation model of additional yaw torque leading by tire blow-out was set up. According to the relativity between the opening duration of inflow valve of the EHB （electric-hydraulic brake system） and the pressure of the brake wheel cylinder, the estimated tire blow-out additional yaw torque was transformed into opening duration of the inflow valve, and the anti tire blow-out additional yaw torque to balance the vehicle was generated by controlling the open duration of different braking cylinders.A test system was designed, and the results show that the anti yaw torque for balancing the tire blow-out vehicle can be estimated by the calculation model, which provides a precondition to improve the response ability of the emergency braking system and precision traveling track control of tire blow-out vehicle.