网络控制系统中基于模糊反馈的消息调度

在网络带宽受限的情况下, 综合考虑了系统响应的误差和误差变化率, 设计了一个共享通信网络的模糊反馈调度器. 该调度器采用模糊最大优先调度算法对网络消息发送的优先级进行动态调整. 同时定义了一种归一化控制质量衡量指标来评价多回路系统的控制性能. 在此评价方法下, 对三种不同调度算法在不同随机时延序列下进行了仿真比较. 结果表明本文提出的调度算法优化了系统的控制性能, 并在不确定运行环境中具有更好的适应性.

Message Scheduling Based on Fuzzy Feedback in Networked Control Systems

Considering the error and error difference of sys- tem response,a fuzzy feedback scheduler that shares commu- nication net is designed with the bandwidth constraints.A scheduling algorithm of the scheduler,namely fuzzy maximum first(FMF),can schedule dynamically the priority of network message.Furthermore,a normalizable criterion of the quality of control(QoC),which can estimate the overall performance of networked control systems,is also defined.By this criterion three different scheduling algorithms with different stochastic delay series are compared with respectively.Finally,the results of simulation highlight that the proposed scheduling algorithm can optimize the performance of control loop and is more flexible than other algorithms in uncertain running conditions.