Dynamic output-feedback fuzzy MPC for Takagi-Sugeno fuzzy systems under event-triggering-based try-once-discard protocol

The fuzzy model predictive control (FMPC) problem is studied for a class of discrete-time Takagi-Sugeno (T-S) fuzzy systems with hard constraints. In order to improve the network utilization as well as reduce the transmission burden and avoid data collisions, a novel event-triggering-based try-once-discard (TOD) protocol is developed for networks between sensors and the controller. Moreover, due to practical difficulties in obtaining measurements, the dynamic output-feedback method is introduced to replace the traditional state feedback method for addressing the FMPC problem. Our aim is to design a series of controllers in the framework of dynamic output-feedback FMPC for T-S fuzzy systems so as to find a good balance between the system performance and the time efficiency. Considering nonlinearities in the context of the T-S fuzzy model, a min-max strategy is put forward to formulate an online optimization problem over the infinite-time horizon. Then, in light of the Lyapunov-like function approach that fully involves the properties of the T-S fuzzy model and the proposed protocol, sufficient conditions are derived to guarantee the input-to-state stability of the underlying system. In order to handle the side effects of the proposed event-triggering-based TOD protocol, its impacts are fully taken into consideration by virtue of the S-procedure technique and the quadratic boundedness methodology. Furthermore, a certain upper bound of the objective is provided to construct an auxiliary online problem for the solvability, and the corresponding algorithm is given to find the desired controllers. Finally, two numerical examples are used to demonstrate the validity of proposed methods.