The Research Of Switched Fuzzy Control Methods Based On Observers

Networked control technology has been gradually mature with the rapid development of science and technology.The networked control theory is applied to switched systems and switched large-scale systems in this paper.Since the bandwidth of the networked systems is usually limited,the event-triggered control is put forward in order to reduce the data transmissions and decline the energy consumption.T-S fuzzy model can approximate the nonlinear functions on a compact set with arbitrary accuracy,so the T-S fuzzy model is used to deal with nonlinear problems in this article.As we all know,actuator saturation is a common phenomenon for the practical control systems.Hence,this paper studies the actuator saturation problems of switched systems in order to reduce the effects of saturation.The concrete contents are given as follows:Firstly,for a class of continuous-time switched fuzzy systems with saturated inputs,the stability problem of the closed-loop systems based on event-triggered control mechanism is studied when the system states are available and unavailable.When the states are available,the fuzzy controllers are designed based on parallel distributed compensation and event-triggered mechanism;when the states are unavailable,this chapter designs the fuzzy observer and observer-based controllers based on multiple Lyapunov stability theory and average dwell time method.Furthermore,the sufficient conditions of guaranteeing the stability of the closed-loop systems are also given.At last,the simulation examples are used to prove the effectiveness of the proposed methods.Secondly,for a class of continuous-time switched fuzzy large-scale systems with saturated inputs,when the sates are available,the decentralized fuzzy controllers are designed by using parallel distributed compensation method and event-triggered mechanism;when the states are unavailable,this chapter designs the fuzzy observer and observer-based decentralized fuzzy controllers based on average dwell time method.The sufficient conditions of ensuring the exponential stability of the closed-loop large-scale systems are shown based on multiple Lyapunov stability theory and are transmitted into linear matrix inequalities.At last,the two numerical examples are given to validate the effectiveness of the proposed methods.Thirdly,for a class of discrete-time switched fuzzy large-scale systems with saturated inputs,when the sates are available,the decentralized fuzzy controllers are designed based on parallel distributed compensation method and event-triggered mechanism;when the states are unavailable,this chapter designs the fuzzy observer and observer-based decentralized fuzzy controllers by using multiple Lyapunov stability theory and average dwell time method.Furthermore,the sufficient conditions of guaranteeing the stability of the closed-loop systems are also given.At last,the numerical examples are shown to prove the effectiveness of the proposed methods.