Analysis And Design Of In-Vehicle Hybrid Network Based On Ethernet AVB

With the informatization and intelligent development of cars, people growing demand for interconnection smart cars, more and more Advanced technology has been applied in the vehicles, such as Advanced driving Assistance Systems(ADAS, the Advanced Driver Assistance Systems), 360-degree panoramic parking system and blu-ray DVD playback system, these new features to drive the demand of on-board network high bandwidth. However, current hybrid network based on CAN bus, because of its low bandwidth, is difficult to meet people's needs. And with the emergence of in-vehicle Ethernet technology, which provides a new technical means to solve the above problem.In-vehicle Ethernet mainly includes BroadR-Reach physical transmission and the Ethernet AVB(Audio/Video Bridging) protocol stack, which has high bandwidth, strong ability to scale and characteristics of open architecture, and can be realized on the list of unshielded twisted pair 100 Mbps full-duplex communication, can meet the requirements of the future automobile body network communication. According to the above problem, this paper mainly studies vehicle hybrid network based on Ethernet AVB protocol and CAN bus, so as to provide new ideas for development future vehicle hybrid network.In this paper the main research content is as follows:First, the thorough research of vehicle hybrid network technology development present situation, put forward the problems existing in the current vehicle hybrid network technology, and in view of the existing problems, studies the related technologies on in-vehicle Ethernet at present, and compared with the traditional vehicle network, analysis summarized the advantage of in-vehicle Ethernet technology.Second, focus on analysis and research the onboard Ethernet transmission physical and the key technologies of Ethernet AVB software protocol stack, design and set up Ethernet AVB network based on BroadR-Reach technology and CAN network hybrid network, realizes Ethernet AVB of video streaming transmission between Talker and Listener, and realize control the Ethernet AVB network video transmission through the CAN network.Finally, according to the characteristics of the design of hybrid network structure, set up a hybrid network system test platform, and according to the principle of hybrid network communication, using the onboard Ethernet testing tools CANoe.Ethernet, respectively on the hybrid network system function test, system performance testing and pedestrian recognition test case, test results show that the design in this paper, based on the Ethernet AVB car hybrid network, basic to realize the function of onboard video image transmission, and image transmission delay is less than 2 ms, meet the onboard Ethernet communications standards, laid a theoretical foundation for future study on the onboard Ethernet, has a certain reference value.