Study of control strategy of automobile magnetorheological semiactive suspension

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.