基于CAN总线网络控制系统中的时延分析及对策  

Analysis and policy of network latency in CAN control system

作　　者：荆楠[1] 王林[1] 安佰岳[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《计算机工程与设计》2009年第20期4599-4602,共4页Computer Engineering and Design

摘　　要：网络时延严重影响网络控制系统的实时性和稳定性。分析CAN总线网络控制系统时延的构成,针对给定的网络控制系统模型,给出系统稳定性与网络时延之间的数学关系式,并讨论了网络负载率对网络时延,系统稳定度的影响。采用基于时间触发方式的CAN总线信息调度方案,结果表明,该调度方法消除了CAN总线系统由于总线冲突而引起的时延。计算机仿真及实验表明,相比于事件触发方案,基于时间触发的CAN总线网络调度方案使系统性能得到明显改善。Real-time and stabilization are affected by network latency in controller area network （CAN）controlsystem. The composition of the network latency is analyzed. Relationship between stabilization and network latency is described by using a mathematical model based on the style of network control system. Affected by traffic load, network latency and stabilization became deteriotative according to this mathematical model. Time-trigger scheduling policy is adopted for CAN control system, which avoided bus collision and removed the network latency. Compared with event-triggered policy, system performance is sharply improved employing time-triggered scheduling policy, proved by both computer simulation and experiments.

关 键 词：网络控制系统 网络时延 时间触发 事件触发 负载率 稳定性 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]