Abstract: How to implement high bandwidth diagnostic communication for vehicles based on Ethernet in vehicle development is undoubtedly a hot topic among engineers. At present, on-board diagnostic technology has become increasingly mature, but there is no standard development system to constrain it. Based on Ethernet and tests diagnostic functions, this paper is achieving a complete closed-loop operation of the diagnostic ecosystem platform. The use of diagnostic communication over Internet protocol (DoIP) has many advantages, such as faster diagnostic response and shorter time for transmitting large amounts of data. The paper will explains the DoIP function from three aspects: UDSonDoIP database development, DoIP diagnostic communication connection, and DoIP flashing examples, combined with practical cases. At the same time, it will provide a comparative analysis between DoIP flashing speed and controller area network (CAN) flashing speed. The results show that diagnostic data transmission based on DoIP not only improves the data transmission speed between diagnostic equipment and electronic control unit (ECU), but also shortens the transmission time, achieving good data transmission performance, and has certain guiding significance for the development of Ethernet diagnostic technology.

Key words: Ethernet technology; on-board diagnostic; DoIP protocol; ECU flashing

摘要： 如何在整车研发中基于以太网实现车辆高带宽诊断通信无疑已是工程师们热议的话题。 目前，车载诊断技术已日趋成熟，但没有标准的开发体系来约束。文章基于以太网和诊断功 能测试，实现了诊断生态平台完整闭环操作，且使用基于以太网协议的诊断通信（DoIP）具 有诸多优势，如更快的诊断响应、传输大量数据的时间更短等。文章将结合实际案例从 UDSonDoIP 数据库开发、DoIP 诊断通信连接和 DoIP 刷写实例三个方面来阐述 DoIP 功能， 同时提供 DoIP 刷写速度与控制器局域网（CAN）刷写速度的对比分析。结果表明，基于 DoIP 的诊断数据传输不仅提高了诊断仪与电子控制单元（ECU）之间的数据传输速度，同时缩短 了传输时间，取得了良好的数据传输性能，对以太网诊断技术开发具有一定的指导意义。

关键词: 以太网技术；车载诊断；DoIP 协议；ECU 刷写