Strategy of time-varying sampling and feedback scheduling for networked control systems

Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (16): 239-241.

• 工程与应用 • Previous Articles Next Articles

Strategy of time-varying sampling and feedback scheduling for networked control systems

LIU Qi1，KONG Feng1，ZHANG Xuelin2

1.Department of Computer Engineering，Guangxi University of Technology，Liuzhou，Guangxi 545006，China
2.College of Electrical Engineering，Guangxi University，Nanning 530004，China

Received:1900-01-01 Revised:1900-01-01 Online:2011-06-01 Published:2011-06-01

网络化控制系统的时变采样及反馈调度策略

刘琦1，孔峰1，张雪林2

1.广西工学院计算机工程系，广西柳州 545006
2.广西大学电气工程学院，南宁 530004

Abstract

Abstract: In multi-processor networked control systems，time-delay of information-transmission is one of the main causes for bad control performance.Improved mixed traffic scheduling algorithm can cut much time-delay by sampling several times in a basic sampling-period and completing time-varying sampling-periods to shorten deadline of information-transmission.And by regulating the basic sampling-period of control system，feedback scheduling model for networked control system can schedule instantly information-transmission and always keep reasonable leisure-time.As a result，time-delay for information in the network is decreased，and a rate of utilization for network is raised.According to the results from simulation experiment，the rate of utilization for network and dynamic performance of networked control systems are all improved.

Key words: networked control system, scheduling algorithm, time-varying sampling, feedback scheduling model

摘要： 多处理器网络化控制系统中，信息传输的时延是使控制性能变差的主要原因之一。改进型混合调度算法通过在一个基本采样周期内的多次采样，形成时变的采样周期，缩减信息传输的截止期，可使信息传输的时延大为减少;同时构建网络化控制系统的反馈调度模型，通过调节基本采样周期，及时调度信息传输，能使网络的空闲时间始终保持在一个合理状态。仿真结果表明，网络利用率有所提高，网络化控制系统的动态性能有所改善。

关键词: 网络化控制系统, 调度算法, 时变采样, 反馈调度模型

LIU Qi1，KONG Feng1，ZHANG Xuelin2. Strategy of time-varying sampling and feedback scheduling for networked control systems[J]. Computer Engineering and Applications, 2011, 47(16): 239-241.

刘琦1，孔峰1，张雪林2. 网络化控制系统的时变采样及反馈调度策略[J]. 计算机工程与应用, 2011, 47(16): 239-241.

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Strategy of time-varying sampling and feedback scheduling for networked control systems

网络化控制系统的时变采样及反馈调度策略

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