摘要
针对事件触发的CAN协议对信息最坏传输时间不具有限制能力这一缺陷,在设计分布式系统CAN总线时为保证信息的在线传输实时性,须对信息的传输实时性进行严格地离线分析。可视化技术是研究工程问题的高效方法与手段。为此本文在研究著名的实时性分析方法即比率单调分析法(RMA)基础上推导出新的易于可视化实现的单步递推关系(SSRR)方程,并基于此原理采用MATLAB/GUI设计可视化实时性分析软件工具,最后把其应用到某汽车CAN总线信息进行离线实时性分析,并采用CAN总线实验系统对分析结果进行系统仿真运行验证。结果表明了该方案的性能优越性。
One of the perceived drawbacks to event-triggered CAN has been the inability to bound accurately the worst-case response time of a given message. To support online-transmission-timeliness guarantees of real-time messages, an adequate offline schedulability analysis is necessary for any real-time distributed CAN bus-based control system. Visual technology is effective way for engineering. A group of new simple single-step-recurrence relation （SSRR） expressions were deduced from the famous rate monotonic analysis （RMA）, and the visual software based on the SSRR for real-time analysis of CAN with MATLAB/GUI was designed. The software was used to real-time analysis for an automotive CAN control system and an online experiment based on CAN development system was made to test the analysis. The result testifies the feasibility of the scheme.
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2008年第9期2345-2347,2374,共4页
Journal of System Simulation
基金
沈阳市科技基金(1063287-1-00)
关键词
比率单调分析法
单步递推关系
可视化设计
离线实时性分析
在线实验
rate monotonic analysis
single-step-recurrence relation
visual design
offiine real-time analysis
online experiment
