车辆直行爆胎过程的模糊PI控制

摘要

车辆的爆胎过程是一个非常复杂的非线性过程,轮胎的力学特性会发生非常快的变化,理论和实验研究都非常困难.根据对爆胎车辆运动特性的分析,建立了二自由度车辆理想运动模型,利用刷子模型模拟爆胎过程中轮胎力学特性的变化,并在Simulink中搭建了七自由度整车模型,仿真车辆在高速直行情况下前轮或后轮发生爆胎后的运动状态.以车辆的横摆角速度作为控制变量,并考虑质心侧偏角的影响,设计了模糊PI控制器,利用差别制动的方式对爆胎车辆进行控制仿真,仿真结果表明,模糊PI控制器能够很好地控制车辆爆胎过程的稳定性,并且能够缩短制动距离.%The process of tire blow-out is a complex nonlinear process and the change of tire's mechanical properties is very quickly. So the theoretical and experimental studies are very difficult. Based on the analysis of motion characteristics of the vehicle tire, a two degree of freedom vehicle model was built. Brush model was used to simulate the change of the tire's mechanical properties. And a seven degree of freedom vehicle model was built with Simulink to simulate the state after front and rear wheels blow—out when the vehicle was at high speed straight. Using the vehicle yaw rate as the control variable and considering the impact of the side slip angle, a fuzzy PI controller was designed. A differential brake method was set up to simulate vehicle behavior after tire blow—out. Simulation results show that the fuzzy PI controller can control the stability of vehicle of tire blow-out very well and shorten the braking distance.