汽车磁流变半主动悬架的控制研究

Study of Control Strategy of Automobile Magnetorheological Semiactive Suspension

为了改善汽车的乘坐舒适性和行驶安全性,提出了一种汽车磁流变半主动悬架的控制策略。首先,设计了磁流变减振器的工作模式,通过试验获得了其速度特性和力学特性,建立了磁流变减振器的数学模型;其次,建立了带磁流变减振器的二自由度车辆简化模型及其参数表;最后,基于双环控制理论,设计了一种控制系统,其外环产生理想的结构阻尼力,内环调节电流驱动器的电流,以使磁流变减振器实时地产生控制阻尼力。仿真结果表明:以磁流变减振器为基础,通过半主动控制技术,悬架系统的振动动态性能得到了有效的控制。

In order to improve passenger comfort and running safety, a control strategy for automobile magnetorheological （MR） semiactive suspension was presented. Firstly, an MR damper working in flow mode was designed. Performance testing was done for this damper. Then, a mathematical model was adopted to characterize the performance of the MR damper. Finally, a quarter-scale 2 DOF car model was set up including the model of the MR damper. Based on different function of inner loop and outer loop of system, a control strategy was adopted. The outer control loop of the control system generated outer target control force, and inner loop stepless adjusted the current of the current driver to drive MR damper to generate controller force. Simulation results show that the vibration of suspension system is well controlled through the semiactive control.