基于电控液压制动系统的车辆稳定性控制策略

Strategy of vehicle stability control based on EHB system

针对带有电控液压制动(EHB)系统的乘用车进行研究,提出了一种新的稳定性控制策略。首先利用模糊推理的方法分别对横摆角速度偏差和质心侧偏角速率的门限值进行确定,然后利用逻辑门限PI控制方法计算出附加横摆力矩,最后在EHB系统上对附加横摆力矩加以实现。另外,还采用模糊PI自整定算法对EHB系统轮缸的目标压力进行优化控制。仿真及实验结果表明:模糊PI自整定算法在EHB的整个工作区段都具有良好的控制效果;当车辆在转向过程中失去稳定时,本文所提出的控制策略能够及时地对车辆进行稳定性控制,提高了车辆在行驶过程中的安全性。

This paper presents a strategy of vehicle stability control based on the Electric Hydraulic Braking（EHB）system of the vehicle.First,the yaw rate deviation and the mass-centre sideslip angle rate threshold are determined using fuzzy inference methods.Then,the logic threshold PI control method is used to calculate the additional yawing moment.Finally the additional yawing moment is realized on the EHB system.In addition,the fuzzy PI self-tuning algorithm is used to optimize the control of the target pressure of the wheel cylinder of EHB system.Simulation and experiment results show that the fuzzy PI self-tuning algorithm can obtain good control effect in the whole working section of EHB system. When the vehicle loses stability in steering,the control strategy can implement corrective action in time to improve the safety of the vehicle.