网络控制系统中的改进型死区反馈调度方法

An Enhanced Deadband Feedback Scheduling Approach in Networked Control System

在网络控制系统(NCS)中,死区反馈调度方法可以在网络资源紧缺时提高服务质量(QoS),但同时以牺牲控制系统的控制品质为代价。本文提出了改进型的死区反馈调度方法,在控制器中加入了预测环节,近似地恢复了失去的采样值,并计算出相应的控制信号对目标进行控制。仿真实验表明:该方法能够提高整个系统的控制性能,在一定程度上弥补死区调度方法的缺点,同时又能保证网络资源的有效利用。

In the networked control system （NCS）, deadband feedback scheduling is able to improve the quality of service （QoS） in the case of insufficient network resource, while will also degrade the quality of control in return. An enhanced deadband feedback scheduling approach is proposed in this paper, which includes the prediction step in the controller to retrieve the lost sample values. Also, the corresponding control signal is calculated to control the object. Simulation results demonstrate that the whole system＇s control performance can be improved by this method. At certain extent, the defect of deadband feedback scheduling is compensated by this method and the efficient utilization of network resource is ensured as well.