Time-delay compensation control and stability analysis of vehicle semi-active suspension systems

With the aim of enhancing the ride comfort and handling stability of vehicles, an improved Takagi-Sugeno (T-S) fuzzy Smith predictive time-delay compensation control strategy (ITSFS) is proposed. Firstly, the vehicle semi-active suspension model with time-delay is established, and the influence of different time-delay sizes is analyzed. Then, combining the theory of time-delay differential equations, the improved Smith predictive time-delay compensation controller is designed. Finally, by combining the semi-active suspension T-S fuzzy controller with the improved Smith predictive time-delay compensation controller, an improved T-S fuzzy Smith predictive time-delay compensation controller for the semi-active suspension system is established. The simulation and experimental results under different operating conditions show that the proposed control strategy can effectively reduce the impact of time-delay on the vehicle semi-active suspension system, significantly improve the dynamic performance of the semi-active suspension system, and have strong adaptive ability to operating conditions. It provides a new method and idea for the research of the semi-active suspension and its control system.