Stability and a scheduling method for network-based control systems

This paper presents network-induced maximum allowable delay bounds for stability of network-based control systems and a scheduling method for network-based control systems by using these bounds. The maximum allowable delay bounds for stability of network-based control systems are obtained using the Lyapunov theorem. Also a scheduling method considering three kinds of data (periodic, real-time asynchronous, and nonreal-time asynchronous data) is presented, which allocates the bandwidth of a network for each node and determines the sampling time of each sensor and controller. This method also guarantees the real-time transmission of the real-time synchronous data and periodic data, and the transmission of the nonreal-time asynchronous data. To show usefulness of the proposed method, the proposed method is tested in two types of network protocols such as the token control and the central control.