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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。
In order to ensure the real-time transmission of information in the design of distributed CAN bus, aiming at the shortcoming that CAN protocol triggered by event is not limited to the worst transmission time of information, we must strictly analyze the real-time transmission of information offline. Visualization technology is an efficient method and means of studying engineering problems. Therefore, this paper derives a new single-step recurrence relation (SSRR) equation which is easy to visualize based on the research of the famous real-time analysis method called RMA. Based on this principle, MATLAB / GUI is used to design visual real-time Sex analysis software tools, and finally apply it to a car CAN bus information offline real-time analysis, and the use of CAN bus experimental system to analyze the results of the system simulation run validation. The result shows the performance superiority of the scheme.