FlexRay网络通信延迟时间分析 |
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引用本文: | 李佳,田光宇,钮翔,陈全世.FlexRay网络通信延迟时间分析[J].清华大学学报(自然科学版)网络.预览,2007(8). |
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作者姓名: | 李佳 田光宇 钮翔 陈全世 |
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作者单位: | 清华大学汽车工程系汽车安全与节能国家重点实验室 北京100084 |
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基金项目: | 国家“八六三”高科技项目(2003AA501100) |
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摘 要: | 为满足未来车辆的通信需求,全球各大汽车及半导体厂商联合设计了FlexRay通信协议。为优化设计FlexRay网络,必须对网络中各消息的通信实时性进行估计。该文依据FlexRay的通信原理,得到了计算基于时分多址(TDMA)的静态段消息的延迟时间和基于柔性时分多址(FTDMA)的动态段消息的延迟时间的数学期望和均方差的公式,使用CANoe.FlexRay对燃料电池城市客车通信进行了仿真,得到了各个消息的延迟时间。FlexRay网络中静态段消息可以精确地按照预先设计的时刻发送,动态段消息的延迟时间则振荡较大,但它的数学期望和均方差只与通信周期有关。
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关 键 词: | 通信实时性 延迟时间 FlexRay 时分多址(TDMA) 柔性时分多址(FTDMA) |
Response time for FlexRay communications |
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Authors: | LI Jia TIAN Guangyu NIU Xiang CHEN Quanshi |
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Abstract: | Almost all leading automobile and semiconductor manufacturers are collaborating to design the FlexRay communication protocol for communications in automobiles. The response time of a given message needs to be evaluated to optimize the communication system design with the FlexRay protocol. This paper presents a mathematical model for the response time of a static segment frame base on the TDMA and a dynamic segment frame base on the FTDMA. The FCHV communication system was also simulated using CANoe.FlexRay to validate the model accuracy. The schedule transmission rates of a static segment frame are shown to be accurate. The model and the simulations show that the mean-square deviation of the response time for dynamic segment frames only correlates with the communication cycle. |
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Keywords: | real-time performance response time FlexRay TDMA FTDMA |
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