Abstract: Controller area netword bus is the main way for onboard electronic components to communicate. Onboard diagnostic interface, as an output end of the bus signal, is used to detect the working state of onboard equipment. In addition, it outputs the working state parameters of the engine and chassis for the analysis of vehicle conditions. In order to realize onboard onboard diagnostic interface signal collection, NXP RT1064 is used as the control unit to design the onboard diagnostic interface transceiving module, power supply module, control button and other peripheral circuits. The onboard diagnostic interface data to be recorded is sent to the external storage module through the serial port every second, and at the same time to the SPI serial TFT display. Real-time observation and acquisition of vehicle operating parameters are realized.

Key words: Vehicle; On-board diagnostic interface; Controller area netword bus; NXP RT1064; Data acquisition

摘要： 控制器局域网总线是车载电子元件进行通讯的主要途径，车载诊断接口作为总线信号 的一个输出端，用于检测车载设备的工作状态，此外，它还可以向外输出发动机与底盘的工 作状态参数用于汽车工况分析。为实现随车车载诊断接口信号的采集，使用恩智浦的 RT1064 作为控制单元，设计了车载诊断接口收发模块、供电模块、控制按键等外围电路，将需要记 录的车载诊断接口数据通过串口逐秒发送至外部存储模块，同时发送至 SPI 串口 TFT 显示屏， 实现了汽车工况参数的实时观测与采集。

关键词: 汽车；车载诊断接口；控制器局域网总线；恩智浦 RT1064；数据采集