Simulation research on vehicle suspension control system

Abstract

The suspension system functions to transmit forces and moments between the wheels and the chassis, absorb impact forces, and ensure vehicle smoothness. In this study, the nonlinear suspension system was simplified to a two-freedom model. State-space equations for the control system were derived. A simulation model was created using Simulink. Both robust and fuzzy control strategies were applied to assess the control system's performance. Simulation results show that as the vehicle's speed increases, both the sprung and unsprung displacement and velocity responses also increase. The suspension system with fuzzy control shows marginally higher vertical displacement and velocity of the vehicle body compared to the robust control system, indicating that fuzzy control is less effective. In contrast, the state-feedback robust controller exhibits greater robustness.