This paper proposes a sliding mode predictive controller with a new robust global sliding surface for a certain networked control system with random time delay, mismatched parametric uncertainty, and external disturbances. First, the model of the networked control system is established, based on which linear transformation is made to get a new form of the system which does not have time delay term in expression. Then a global sliding surface is proposed followed by the sufficient condition given in the form of linear matrix inequality (LMI) to guarantee system stability and robustness. Subsequently, a sliding mode predictive controller is proposed with modified reaching law as its reference trajectory and the rolling optimization method is combined to provide optimal control input for each step so that chattering can be minimized. Finally, simulations have been made and the results indicate the advantages of the proposed controller in the aspect of convergence speed, chattering suppression, and robustness to uncertainties.

This paper investigates the predictive sliding mode control problem of networked control system with long-time delay and consecutive packet dropout in both sensor-controller link and controlleractuator link. A new modeling method that uses only one Markov chain to describe the time delay and packet dropout in a unified model is proposed. As a modification of the original law, a new chattering-free reaching law that is suitable for multiple-input systems is proposed and is later used as the reference trajectory of the designed predictive sliding mode controller. To overcome the influence of time delay and packet dropout, a novel predictive sliding mode controller equipped with a logic zero-order-holder and delay compensator is proposed, and the proposed compensation strategy is theoretically proven to be able to make the system completely free from the influence of long-time delay and consecutive packet dropout. Finally, a simulation example is given to illustrate the validity of the proposed controller.INDEX TERMS Networked control systems, sliding mode control, predictive control, time delay, packet dropout. I. INTRODUCTIONRecently, networked control systems (NCSs) have attracted much attention because of their theoretical and practical significance. In NCSs, the actuators, controller and sensors of a physical plant are distributed in a large physical space and linked together by a communication network. The advantages of NCSs, such as low cost, reduced weight, and easy installation and maintenance, which were unavailable in the past, have been widely recognized [1], [2]. Despite these advantages, the introduction of communication network will inevitably lead to time delay, packet dropout, packet disordering, communication constraints, quantization errors, etc., which may cause degradation or even instability of the NCSs [3]-[9]. Among all the challenging issues that have emerged, time delay and packet dropout are recognized as the most common and critical problems of NCSs and thus have attracted considerable research interest [3], [4], [10]-[14].The associate editor coordinating the review of this manuscript and approving it for publication was Zonghua Gu.

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With a focus on aero‐engine distributed control systems (DCSs) with Markov time delay, unknown input disturbance, and sensor and actuator simultaneous faults, a combined fault tolerant algorithm based on the adaptive sliding mode observer is studied. First, an uncertain augmented model of distributed control system is established under the condition of simultaneous sensor and actuator faults, which also considers the influence of the output disturbances. Second, an augmented adaptive sliding mode observer is designed and the linear matrix inequality (LMI) form stability condition of the combined closed‐loop system is deduced. Third, a robust sliding mode fault tolerant controller is designed based on fault estimation of the sliding mode observer, where the theory of predictive control is adopted to suppress the influence of random time delay on system stability. Simulation results indicate that the proposed sliding mode fault tolerant controller can be very effective despite the existence of faults and output disturbances, and is suitable for the simultaneous sensor and actuator faults condition.