Jun Zhao

In this paper, the anti-disturbance bumpless transfer control problem is addressed for switched fuzzy systems without stable subsystems under event-triggering. First, we establish an original characterization of the anti-disturbance hybrid bumpless transfer performance to simultaneously attenuate disturbances and abrupt large hybrid bumps caused by both switching and triggering. Second, a novel dynamic event-triggered scheme that incorporates triggering-induced bumps and switched turning parameters is designed to improve bumpless transfer performance further. Then, solvability conditions are developed for the considered anti-disturbance hybrid bumpless transfer control problem. Moreover, the bump-dependent dynamic event-triggered scheme, a state-dependent switching law, and disturbance-observer-based event-triggered controllers are designed simultaneously. Finally, a tunnel diode circuit model and a numerical example are used to verify the effectiveness of our method.

This article investigates the cooperative output regulation problem via bumpless transfer (BT) control for switched multiagent systems. First of all, a novel distributed estimator is constructed to track the exosystem for each agent via dynamic output feedback and aperiodic sampled-data transmission. Through the time-dependent Lyapunov functional and free-weighed matrix, the tracking performance between the estimator and the exosystem is achieved and auxiliary dynamic variable asymptotically converges to zero. Further, according to the information of observer and estimator for each agent, the BT controller and the agent-state-dependent switching law are jointly designed to suppress control bumps and determine which subsystem to be activated. Besides, to cope with the tough scenario that the classical design of a single controller for each subsystem cannot achieve the decline of Lyapunov function and satisfactory BT performance simultaneously, two controllers are designed for each subsystem. In this way, a two-layer switching strategy is presented to deal with the problem of cooperative output regulation with satisfactory BT performance. Finally, two examples are provided to demonstrate the validity of results.

This paper establishes a framework of dual-source bumpless transfer control for switched linear systems. A new performance called integral bumpless transfer performance is introduced to measure the distance between the real control signal and the reference control signal over the whole time domain. Moreover, the classical switching-related bumpless transfer performance to suppress the bumps of the control signal at switching points is simultaneously considered. Thus, the dual-source bumpless transfer control problem is formed, aiming at achieving stability while preserving both bumpless transfer performances. A sufficient condition for asymptotic stability with dual-source bumpless transfer performance is developed with the controller and switching law designed. Finally, through the railway system model, the feasibility and the superiority of the proposed dual-source bumpless transfer control strategy are illustrated.

In this brief, we address an adaptive multiobjective switching control problem for vehicle active suspension systems (ASSs) from a switched system point of view. An ASS is modeled as a multiple mode switched system for the first time. Each mode represents a body height mode. This switched system enables us to improve ride comfort, fuel economy, handling stability, and driving safety by adjusting the height. In addition, an adaptive control method is presented to online compensate the unknown sprung mass. In this work, a switching mechanism is developed to guarantee stability of the closed-loop ASSs by using multiple Lyapunov functions (MLFs) under the dwell time framework. Finally, the effectiveness and benefits of the proposed switching control scheme are illustrated by simulation results.

This paper studies bumpless transfer control for a class of switched linear systems. We propose a hierarchical switching strategy to solve the bumpless transfer control problem. The key point is to design two controllers for each subsystem. This is based on the consideration that in many cases the conventional design of each subsystem equipped with only one controller cannot achieve stability and satisfactory bumpless transfer performance simultaneously. The upper level switching determines which subsystem to be active while the lower level switching chooses which controller from the two controllers of the active subsystem to be switched on. The dual design of the switching and controllers makes the closed-loop switched system asymptotically stable with a satisfactory bumpless transfer performance. Numerical examples are provided to illustrate the validity of the proposed methods.

This study investigates the distributed event-driven filtering problem for a class of discrete-time systems in sensor networks (SNs) with switching topology. The addressed systems are considered to suffer from the unknown nonrandom perturbations with bounded peak, and thus the existing filtering or estimation approaches for switched SNs become inapplicable. To tackle this situation, a novel reachable-set-based distributed filtering strategy is established. With the proposed piecewise Lyapunov function approach and the minimum dwell time switching mechanism, sufficient conditions are then formulated for the existence of admissible filters in both the secure and nonsecure communication channels. We prove that the resultant filtering error is ultimately confined to a bounded closed set, which can also be minimized to achieve an optimal perturbation attenuation level in the sense of reachable set. Finally, the practicability and effectiveness of the developed design technique are demonstrated via the distributed event-driven filtering of a two-spring-mass mechanical system monitored by the SN.

This paper mainly focuses on the output regulation (OR) bumpless transfer (BT) control problem for discrete-time switched linear systems (DSLSs). A procedure for solving the OR BT control problem is given by means of the multiple Lyapunov functions technique. Firstly, the definition of the performance of BT for DSLS is introduced. Next, the state-dependent switching law and a group of BT feedback controllers for solving the OR BT problem are designed. Then, a sufficient condition and its deformation form are obtained without the solvability requirement of OR BT control problem for every subsystem. Finally, the Chua’s circuit example is presented and the results of the simulation verify the effectiveness of the proposed control scheme.

This work focuses on an adaptive control problem for active suspension systems (ASSs) with the acceleration performance constraint over the controller area network (CAN). We aim to develop an effective event-triggered control technique to significantly reduce the communication burden of the CAN. To this end, an event-triggered mechanism based on the switching threshold is developed to obtain satisfactory suspension performances while greatly improving the network resource utilization on the CAN. In particular, the threshold parameters are adjusted according to road conditions, which enhances the flexibility of the event-triggered mechanism in face of different road excitation. Then, we propose a novel adaptive algorithm based on the acceleration constrained model by means of which the method ensures that the maximum overshoot of the vehicle acceleration cannot be violated. Moreover, under the presented control strategy, the performance requirements in the resulting closed-loop ASSs are guaranteed, while the tracking error of the vertical displacement converges to a small region. Finally, simulation results by using the simulator consisting of the professional vehicle simulation software Carsim and MATLAB/Simulink are provided to demonstrate the effectiveness of the proposed methodology.