Research on Active Suspension Control Based on Vehicle Speed Control Under Transient Pavement Excitation

Transient road excitation can cause high-frequency impacts to the vehicle, leading to deterioration of smoothness and operational stability, and seriously impairing system life and performance. To address this problem, the vehicle model and the road model containing transient road excitation is first established, and the impact mechanism of transient excitation is simulated and analyzed, from which the fuzzy control of vehicle speed and the model predictive control of the suspension system are designed respectively. The suspension control method based on the speed control is further proposed, which sets the strategy to use fuzzy control to regulate the vehicle speed after the on-board sensors identify the bumpy road excitation, and at the same time to implement the model predictive control for the active suspension system, and dynamically adjusts the control weight parameters to be compatible with the vehicle speed control. The simulation results show that compared with the single suspension control, the control strategy improves in all stages, and the root mean square values of body acceleration, pitch angle acceleration, and front and rear tire dynamic loads are reduced by 9.52%, 4.55%, 29.5% and 17.8%, respectively, and the peaks are reduced by 23.8%, 39.9%, 44.7% and 33.2%, respectively, which further enhances the safety and ride comfort of the vehicle. Finally, the effectiveness and correctness of the strategy are verified by a hardware-in-the-loop test.