网络化控制系统的时变采样及反馈调度策略

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.%In multi-precessor 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.