基于时间窗口的网络控制系统调度算法

由于网络控制系统中各个控制设备共享物理传输介质,造成了控制设备争用总线的问题,从而引起了控制数据传输的延时,而反馈控制系统的稳定性能由环延时决定,需要研究一种调度算法对网络中消息的传输进行调度,使消息可以满足其实时性要求。该调度算法从控制系统稳定性能角度出发,利用控制环的最大允许环延时确定控制环的采样周期,同时基于时间窗口得出控制环中各个节点的起始传输时刻,最终确定了系统静态调度表的结构。最后分析了该调度算法在CAN总线应用中需解决的问题以及未来的研究工作。

Scheduling algorithm in networked control systems based on time window

As all the control devices of networked control systems shared physical transmission medium,there is the problem of control devices competing the field bus and it leads to the transmis-sion delay of control data. The loop delay determined the stability performance of feedbackcontrol system, so researching a scheduling algorithm is required that satisfies the real-time requirement of message. From the point of the control system's performance, thescheduling algorithm utilized the maximum allowable loop delay to determine sample pe-riod and based on Time Window find the starting transmission time of the network node. Atthe end system static scheduling table structure is established. Ultimately the problemsthat need to be resolved when the scheduling algorithm applied to CAN fieldbus are ana-lyzed and the future research work is presented.