Abstract
This paper proposes a novel controller for vehicle suspension system to regulate the current driving state, which is helpful to improve ride comfort while the dynamic wheel load and the suspension deflection keep in a safe and appropriate region. The idea of the control method is using one-step time-delay to estimate the road excitation that is difficult to be measured. Thus, a road excitation predictive discrete-time sliding mode control (PDSMC) using proportional-integral (PI) sliding function for the vehicle system is proposed to enhance the comfortability when driving. The outstanding of this controller is that only a simply second-order vehicle suspension system is required when implementing and can provide a fast dissipation speed so that the oscillations would be eliminated as soon as possible. Moreover, this approach can integrate with quarter-car seamlessly and provide a satisfactory road holding ability. The stability of this system is verified using Lyapunov function approach and the effectiveness has been validated in a comparison with incremental PID method using MATLAB simulation.