FlexRay网络通信时滞性分析  

Analysis of FlexRay Network Communication Delay

作　　者：庄江丽[1] 邱瑞昌[1] 高健 刘彪[1,3] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]中国机械工业建设集团有限公司电力工程事业部,北京100045 [3]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《机械与电子》2012年第9期24-27,共4页Machinery & Electronics

基　　金：北京交通大学基本科研业务费资助项目(2011JBM114);清华大学汽车安全与节能国家重点实验室开放基金资助项目(KF11142)

摘　　要：随着人们对汽车安全性的要求越来越高,车载网络通信的主干网络CAN网络在实时性和消息确定性等方面已经不能满足人们的要求,而FlexRay网络由于其基于时间触发的确定性、双通道容错性等特点开始引起重视,从而成为研究热点。但是在FlexRay的应用中仍然存在通信延时的缺陷。主要是针对网络的通信延时进行了分析。通信周期分为静态段与动态段,静态段采用TDMA(时分多址访问方式),因而主要是对数据帧自身的传输延时进行分析;动态段采用FTDMA(柔性的时分多址访问方式),因而主要是对传输延时和发送延时进行分析;最后利用了仿真软件进行理论计算的验证,旨在能够确定应用中所需要的确切通信时间。Along with people＇s demanding on car＇s safety having become increasingly improved, and the main car communication network - CAN network can not satisfy the requirement of people in the real-time performance and determinacy, but the FlexRay network which has benefits to time- triggered determinacy and twin channel＇s fault - tolerance has call people＇s attention and gradually becomes the research hotspot. However it still exists some weakness in the communication delay. This paper is aimed at the network communication delay. Communication cycle is divided into static segment and dynamic segment, static section use the way of TDMA （time division multiple access）, so we mainly focus on the data ;rame;s transmission delay; Dynamic section adopts the FTDMA （flexible time division multiple access）, so the transmission delay and transmitting delay analysis are our point. Finally, we take advantage of the simulation software to verify the calculation, and our goal is to learn the actual communication time.

关 键 词：FLEXRAY 通信延时 传输延时 发送延时 

分 类 号：TN915.05[电子电信—通信与信息系统]