Semi-Active Control of Energy-Regenerative Suspension Based on Hybrid Control Strategy

To achieve semi-active control of energy-regenerative suspension in a certain range, the motor electromagnetic damping force was described by the formula related to velocities of sprung mass and unsprung mass based on hybrid control strategy. Since the motor was not powered by external source when semi-active controlled, the control force was limited by the motor maximum electromagnetic force. The influence of damping force on suspension dynamic performance was discussed, as well as the conditions to achieve semi-active control were studied. On this basis, the particle swarm optimization was used to decide the control parameters with ride comfort as objective function. To follow the required damping force, a direct current controller was designed. Finally, the simulation analysis of energy-regenerative suspension with hybrid control strategy under random road excitations was performed. The results show that the optimal control parameters can ensure semi-active control and energy regeneration of energy-regenerative suspension. The ride comfort is improved obviously.