Abstract: Aiming at the shortage that the existing vehicle terminal can't connect with the third-party specific cloud service platform, a general vehicle terminal based on automotive on-board diagnostics (OBD) technology and global positioning system (GPS) technology is designed. The vehicle terminal is based on STM32F103ZET6 single chip microcomputer, and is composed of GPS module, 4G communication module, liquid crystal display (LCD) and so on. Vehicle terminal obtains OBD data stream through automobile controller area network (CAN) bus, obtains automobile position data through GPS module, and communicates with cloud server through 4G communication module. The experimental results show that the vehicle terminal works stably and reliably, can read the OBD data stream of the vehicle, accurately obtain the positioning data of the vehicle, and send the data to multiple cloud servers in real time, and can receive the data information sent by the cloud servers, thus realizing the functions of remote monitoring of the vehicle, road risk warning and other networking.

Key words: Vehicle terminal; Cloud service platform; OBD data flow; GPS module; 4G module

摘要： 针对现有车辆的车载终端不能连接第三方特定云服务平台的不足，设计了一种基于汽 车车载自动诊断系统（OBD）技术和全球定位系统（GPS）技术的通用型车载终端。车载终 端以 STM32F103ZET6 单片机为核心，由 GPS 模块、4G 通信模块、液晶显示器（LCD）等组 成。车载终端通过汽车控制器局域网络（CAN）总线获得 OBD 数据流，通过 GPS 模块获得 汽车位置数据，通过 4G 通信模块与云服务器进行通信。试验结果表明，该车载终端工作稳定 可靠，能够读取汽车 OBD 数据流，能够准确地获得车辆的定位数据，并将数据实时发送到多 个云服务器，能够接收云服务器下发的数据信息，实现对车辆的远程监控、道路风险预警等 车联网功能。

关键词: 车载终端；云服务平台；OBD 数据流；GPS 模块；4G 模块