| 汽车FlexRay网络静态段帧封装机制研究 |
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| 引用本文： | 王跃飞,张恒,张亚生,刘红军.汽车FlexRay网络静态段帧封装机制研究[J].中国机械工程,2015,26(22):3021-3027. |
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| 作者姓名： | 王跃飞 张恒 张亚生 刘红军 |
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| 作者单位： | 1.合肥工业大学,合肥,230009;
2.安全关键工业测控技术教育部工程研究中心,合肥,230009 |
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| 基金项目： | 国家自然科学基金资助项目(61202096);教育部留学回国人员科研启动基金资助项目(\[2013\]693);中央高校基本科研业务费专项资金资助项目(2013HGCH0014);安徽省省级高等学校自然科学研究资助项目(KJ2012A226);江淮汽车技术中心资助项目（W2014JSKF0086） |
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| 摘 要： | 在分析FlexRay消息帧格式和帧编码的基础上,推导出静态时隙长度和总线利用率计算公式,分析了影响总线利用率的主要因素;提出帧封装的前提条件，给出了帧有效负载段上下限精确计算方法；在此基础上，以超周期内总线利用率最高为优化目标，建立了解决帧封装问题的整数线性规划模型，并给出求解该模型的启发式算法。SAE实验结果证明该方法不仅能够提高总线利用率，而且可有效缩短算法执行时间。
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| 关 键 词： | FlexRay总线 静态时隙 总线利用率 帧封装 |
Research on Frame Packing Mechanism of Static Segment in Automobile FlexRay Network |
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| Wang Yuefei,Zhang Heng,Zhang Yasheng,Liu Hongjun.Research on Frame Packing Mechanism of Static Segment in Automobile FlexRay Network[J].China Mechanical Engineering,2015,26(22):3021-3027. |
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| Authors: | Wang Yuefei Zhang Heng Zhang Yasheng Liu Hongjun |
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| Affiliation: | 1.Hefei University of Technology,Hefei,230009
2.Engineering Research Center of Safety Critical Industrial Measurement and Control Technology of Ministry of Education,Hefei,230009 |
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| Abstract: | On the basis of analyzing FlexRay frame format and coding,the calculation formula of the length of static slot and bus utilization rate were obtained,and main factors that influenced bus utilization rate were given.Some prerequisites of frame packing and exact calculation method of lower and upper bounds of the size of the payload segment were proposed.Finally, with the target of realizing highest bus utilization rate in super cycle,the integer linear programming model was established to solve the problem of frame packing and heuristic algorithm of solving the model was given.The American socity of automotive engineers(SAE) experimental results demonstrate the effectiveness of the proposed method,which raises the bus utilization rate,and reduces the execution time of algorithm. |
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| Keywords: | FlexRay bus static slot bus utilization rate frame packing |
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