Research On The Event-triggered Control Strategy Of The Switched Networked Control Systems

With the advent of information,networked control system(NCS)has been widely used in industrial production,intelligent transportation and intelligent home and other fields.Especially under the background of digital transformation and upgrading of manufacturing industry,networked control system plays a crucial role.At the same time,the scale of control system is expanding,showing the characteristics of multi-mode and complexity,so networked switched system has attracted extensive attention of scholars.However,the use of network also brings the network induced problems such as channel congestion,network packet loss and so on.It is worth mentioning that event-triggered scheme,as an on-demand execution strategy,can effectively alleviate network bandwidth pressure and network induced problems,and has been widely introduced into the control systems in recent years.At present,the event-triggered control for networked switched systems mainly adopts static event-triggered conditions,and the research on event-triggered scheme combining the characteristics of control system and dynamic performance is not deep enough.Therefore,further research on event-triggered control strategy of networked switched system has certain theoretical significance and application value.In this paper,we aim to solve the event-triggered control problem for the networked control systems based on the switched system model.In the framework of networked control system,supported by the switched system model,we deeply analyze the dynamics of network switched system under limited switching signal behavior,and then established a variety of effective event-triggered controller design algorithms.The contents can be summarised from the following aspects:(1)The stabilization control of NCS based on the dynamic event-triggered scheme is studied.In this paper,the dynamic event-triggered scheme is designed by introducing dynamic variables for networked switched systems,and a new design algorithm of dynamic event-triggered controller based on switched system model is proposed by using the piecewise Lyapunov function method.The effectiveness and superiority of the proposed dynamic event-triggered strategy for NCS switched system are verified by a simulation example.(2)The stabilization control of NCS based on the hybrid-triggered scheme is studied.Considering the network induced phenomena such as packet loss in the actual NCSs,if the traditional single event-triggered scheme is still used,the system performance can not be guaranteed or even the stability of the system can be destroyed.Therefore,this paper establishes a hybrid-triggered scheme for networked switched system,that is,the time-triggered scheme or event-triggered scheme for data transmission depends on the network condition.The stochastic analysis method is used to design the algorithm of hybrid-triggered controller,which effectively overcomes the influence of network packet loss on the steady-state performance of the system and guarantees the dynamic balance between network communication resources and system performance.(3)The problem of event-triggered sliding mode control for NCS with external disturbance is studied.In this paper,the reduced order sliding mode dynamics model of the networked switched system is established by model transformation,the event-triggered conditions are established based on the accessibility of the switched sliding mode control system,and the event-triggered sliding mode control scheme combining the sliding mode dynamic characteristics and steady-state performance of the networked switched system is proposed.The existing solution of event-triggered control for networked control systems with disturbance is further improved.