【作者】 黄斌；

【导师】 王跃飞；

【作者基本信息】 合肥工业大学 ， 机械制造及其自动化， 2018， 硕士

【摘要】 随着汽车行业的高速发展,人们对车辆驾驶的舒适性、安全性和娱乐性要求不断提高,汽车行业正向着智能化的方向前进。与此同时,对车载网络的通信带宽和可拓展性也提出了更严苛的要求。为解决汽车智能化造成车内网络通信带宽需求不断增长的问题,车载Ethernet技术应运而生。相对于传统的CAN、FlexRay等总线,它具有高带宽、低成本、可拓展性强等优点,目前正在车载网络领域迅速发展,在未来极具市场前景。本论文以国家自然科学基金为依托,通过收集和阅读大量国内外相关的研究资料,对Ethernet AVB网络的预留带宽设计机制进行了研究。首先,分析Ethernet AVB网络通信协议标准,并给出智能汽车中应用的网络拓扑结构,随后通过定义预定流量来传输网络中的安全关键类消息;在此基础上,通过分析流预留协议和消息传输实时性,提出了网络中各类型消息的最坏响应时间分析方法,并给出对应的定量计算公式和推导过程。其次,针对利用IEEE标准预留带宽配置方法可能导致网络消息错过其截止期的问题,提出超预留带宽设计方法;同时以超预留带宽最优为目标,以消息实时性和IEEE标准最大预留带宽为约束,建立了车载Ethernet AVB网络参数优化模型,并给出求解该模型的OAPO和OBPO算法,随后对该方法进行了评估。最后,利用工具开发了Ethernet AVB网络预留带宽设计软件,搭建了仿真实验平台并设计实验方案,对本文提出的方法进行验证。实验结果表明:本文提出的方法不仅能够满足系统可调度性要求,而且能有效提高Ethernet AVB网络可靠性。本论文的研究成果对提高智能汽车Ethernet AVB网络的实时性与可靠性具有一定的理论意义和工程价值。更多还原

【Abstract】 With the rapid development of the vehicle industry and increasing requirements for the comfort,safety and entertainment of vehicle driving.The vehicle is developing towards the direction of intelligence,at the same time,the bandwidth and expansibility of the vehicular network communication are also higher.Ethernet network technology has born to solve the problem of increasing demand for network communication in vehicle intelligentization.Compared with the traditional CAN and FlexRay bus,Ethernet has the advantages of high bandwidth,low cost and strong expansibility,it is developing rapidly in the field of vehicle network,and has a great market prospect in the future.This thesis is supported by National Nature Science Fund.By collecting and reading domestic and foreign related research,the design mechanism of reserved bandwidth for Ethernet AVB network is studied.At first,the standard of Ethernet AVB network communication protocol is analyzed,and the topology structure applied in the intelligent vehicle is given.Then,the safety-critical class message in the network is transmitted by defining the scheduled traffic.On this basis,by analyzing the stream reservation protocol and the real-time of message transmission,the analysis of the worst response time of the network transmission message is proposed,also the calculation method and the derivation process are given.Secondly,considering that the IEEE standard reservation bandwidth configuration method may cause the network message to miss its deadline,the design method of over-reservation bandwidth is proposed.At the same time,the optimization model of Ethernet AVB parameters is established with the target of optimal over-reservation bandwidth,and with the constrain of real-time and IEEE standard maximum reserved bandwidth,also OAPO and OBPO algorithm is proposed to solve the model,and the evaluation of algorithm is given.Finally,the Ethernet AVB network design software is developed with the software tool,also the simulation experiment platform is set up and the experiment scheme is designed.Then the simulation experiment is carried out to conform the method of this thesis.The experimental results show that the proposed method can not only meet the schedule-ability requirements of the system,but also effectively improve the reliability of Ethernet AVB network.The research results of this thesis have theoretical significance and engineering value to improve the real-time and reliability of Ethernet AVB network in intelligent vehicle.更多还原