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目前网络控制系统多采用事件驱动方式,这种驱动方式适用于网络延时小于一个采样周期的网络控制系统。为了解决网络延时大于一个采样周期的问题,提出了事件-时间驱动方式。在采用事件-时间驱动方式下系统成为变采样网络控制系统。在网络时延大于一个采样周期情况下,系统中的控制值和反馈值不能准时到达时,该系统使用预测环节预测的预测值。在基于预测值的变采样网络控制系统中,给出了不同网络时延所对应的状态转移矩阵,分析了变采样网络控制系统稳定需要的条件,最后给出了一个例子说明了变采样网络控制系统采用预测值控制可以使系统稳定运行。
The current network control system to use more event-driven approach, this drive is suitable for network latency less than one sampling period of the network control system. In order to solve the problem that the network delay is greater than one sampling period, an event-time driven approach is proposed. Under the event-time driven approach, the system becomes a variable sampling network control system. When the network delay is greater than one sampling period, when the control and feedback values in the system can not arrive on time, the system uses the predicted value predicted by the predictive part. In the variable sampling network control system based on the predictive value, the state transition matrices corresponding to different network delays are given, and the conditions required for the stability of the variable sampling network control system are analyzed. Finally, an example is given to illustrate how the variable sampling network control The system uses the predicted value control can make the system stable operation.