| 汽车CAN系统精确时钟同步机制研究 |
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| 引用本文： | 王跃飞,杨锦,张利,张本宏. 汽车CAN系统精确时钟同步机制研究[J]. 电子测量与仪器学报, 2014, 0(1): 22-28 |
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| 作者姓名： | 王跃飞 杨锦 张利 张本宏 |
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| 作者单位： | [1]合肥工业大学机械与汽车工程学院,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 [3]合肥工业大学计算机与信息学院,合肥230009 |
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| 基金项目： | 国家自然科学基金（61202096）、国家电子信息产业发展基金（[2010]301）、安徽省自然科学基金（1208085QF118）、安徽省科技计划项目（1101c0603059）、安徽省省级高等学校自然科学研究项目（KJ2012A226,KJ2012A229）、中央高校基本科研业务费专项资金资助（2013HGCH0014）、教育部留学回国人员科研启动基金（[2013]693）、广东省教育部产学研结合项目（20128091100417）;国家电子信息产业发展基金（工信部财函[2011]506号） |
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| 摘 要： | 高可靠、高精度的时钟同步机制对于汽车CAN网络安全运行有着重要影响。针对分布式汽车网络同步问题,引入4种特殊的报文帧,定量研究了同步帧传输的网络时延,给出了即时偏差与网络延时的测算方法;在此基础上,结合基于最小"相对即时偏差和"的主时钟协商选择方法,建立了支持主时钟选择的精确时钟同步机制。实验结果表明,该机制不仅具有较高的同步精度和可靠性,而且有效降低了同步网络开销,能够满足当今汽车的高实时性要求。
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| 关 键 词： | 时钟同步 网络传输延时 即时偏差 主时钟选择 |
Research on precise clock synchronization mechanism of car CAN system |
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| Wang Yuefei,Yang Jin,Zhang Li,Zhang Benhong. Research on precise clock synchronization mechanism of car CAN system[J]. Journal of Electronic Measurement and Instrument, 2014, 0(1): 22-28 |
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| Authors: | Wang Yuefei Yang Jin Zhang Li Zhang Benhong |
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| Affiliation: | 1. School of Machinery and Automobile Engineering, Hefei University of Technology, Hefei 230009, China; 2. Engineering Research Center of Safety Critical Industrial Measurement and Control Technology of Ministry of Education, Hefei 230009, China ;3. School of Computer ＆ Information, Hefei University of Technology, Hefei 230009, China) |
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| Abstract: | High reliability and high precision clock synchronization mechanism has an important impact on the safe operation of automotive CAN network. Aiming at the problem of the synchronization in distributed automotive net- work, four special message frames are introduced, the network delay of synchronization frame transmission quantita- tively is studied, and the measurement method of instant deviation and network delay are given. On this basis, com- bined with the master clock consultation selection method based on the minimum relative instant deviation sum, a precise clock synchronization mechanism supporting master clock selection is established. The experiment results show that this mechanism achieves a high synchronization precision and reliability,and reduces the synchronization network overhead effectively. Therefore it can meet the high real-time requirement of today＇s cars. |
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| Keywords: | clock synchronization network transmission delay instant deviation master clock selection |
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