|Table of Contents|

Hierarchic Scheduling Policy Based on Fuzzy Feedback in Networked Control Systems


Research Field:
Publishing date:


Hierarchic Scheduling Policy Based on Fuzzy Feedback in Networked Control Systems
GAO Zheng-nanFAN Wei-huaCHEN Qing-weiHU Wei-li
School of Automation,NUST,Nanjing 210094,China
networked control systems industrial ethernet priority bandwidth allocation hierarchic scheduling fuzzy feedback
According to the characteristics in industrial ethernet networked control systems(IE-NCS),limited priority queues and finite network bandwidth shared by control-loop data,non-realtime data and emergent data,a hierarchic scheduling policy based on fuzzy feedback(HSP-FF) is presented.Requirements of PoC(Performance of control) of control loops and QoS(Quality of service) of non-realtime nodes are comprehensively considered in HSP-FF.The bandwidth range of every control-loop and non-control node is periodically allocated by the appointed scheduling node.Within the allocated bandwidth range,the period and packet priority of control loops are dynamically set by considering error and error difference of control loops in the controller node;the packet length and packet priority of non-control nodes are dynamically set by considering time delay and packet drop rate in the non-realtime node.HSP-FF is validated by the comparative experiment with LEDF(Linearly earliest deadline first),LEDF+DB(Deadband),LMTS(Linearly mixed traffic scheduling) and LMTS+DB.


[ 1] ?? Zuber iK M, Sh in K G. Scheduling m essag es on control area network for rea-l time CIM applications [ J]. IEEE Transactions on Robo tics and Autom ation, 1997, 13( 2): 310- 314.
[ 2] Sa lehM, Othm an Z, SalehM. Effic ient hierarch ica l d if-f EDF schedu lab ility for QoS packet netw orks[ A ]. 2008 IEEE / ACS Internationa l Con fe rence on Com pu-t er System s and App lications ( AICCSA??08) [ C]. Piscataw ay, USA: Institute o f E lec trical and E lec tron ics Eng ineers Inc. , 2008: 815- 819.
[ 3] 李祖欣, 王万良, 雷必成, 等. 网络控制系统中基于 模糊反馈的消息调度[ J] . 自动化学报, 2007, 33( 11) : 1229- 1232.
[ 4] Zhao Y B, L iu G P, Rees D. Integrated predictiv e contro l and scheduling co-design fo r netw orked contro l system s [ J]. IET Con tro l Theory & App lications, 2008, 2( 1) : 7- 15.
[ 5] W alsh G C, YeH ong. Scheduling o f netwo rked contro l system s[ J]. IEEE Contro l Sy stem sM agaz ine, 2001, 21( 1): 57- 65.
[ 6] 王艳, 蔡骅, 陈庆伟, 等. 网络控制系统反馈调度器 的设计[ J]. 电子学报, 2007, 35( 2): 379- 384. [ 7 ] 汤贤铭, 钱凯, 俞金寿. 网络控制系统动态死区反 馈调度[ J]. 华东理工大学学报( 自然科学版), 2007, 33( 5): 716- 721.
[ 8] Zhou L iang, W ang X inbing, Li Ya jun, et a.l Optim a l schedu ling fo r mu ltip le descr iption video stream s in w ire less mu ltihop ne tw orks[ J]. IEEE Comm un ications Le tters, 2009, 13( 7) : 534- 536.
[ 9] 白涛, 吴智铭, 杨根科. 基于CAN 网的模糊优先级 配置策略[ J] . 控制与决策, 2005, 20( 3) : 285- 289 ( 293).
[ 10] 陈磊. 从现场总线到工业以太网的实时性问题研 究[ D]. 杭州: 浙江大学工业控制技术国家重点实 验室, 2004.


Last Update: 2012-11-02