高压共轨ECU下线测试系统设计与开发

Design and development of eol test system on common rail ECU

针对国内ECU测试设备智能化程度低、扩展性差等问题,对高压共轨ECU输入/输出信号和工作原理进行了分析,对现有的ECU测试方法进行了研究,设计了一款基于虚拟仪器的高效、智能、可扩展的下线测试系统,实现了ECU自动连接、电源管理、程序烧录、一键测试和数据库管理等功能;该系统采用模拟ECU实际工况和读取ECU存储单元内部数据的方法来判断ECU对应功能的正常与否,测试系统和待测ECU的通信采用基于CAN总线的CCP协议;通过上位机程序结合Lab VIEW和Test Stand软件各自优点,分3层架构完成了测试系统软件开发,实现了简单直观的软件用户界面。实际测试结果表明:该系统能够实现ECU的全功能下线测试,消除了人为操作对测试结果的影响。

Aiming at the problems of domestic ECU test system,such as low intelligence and poor scalability,the input/output signals and functions of high pressure common rail ECU were analyzed,and the existing achievements of ECU test system were summarized. A high efficiency,intelligent and extensible EOL（ end of line） test system was designed which can perform automatic connection,power management,program downloading,test with one click and database management. Simulation of the actual working conditions and fetching the content of the right location was used to test the corresponding function,and can calibration protocol was used to communicate between ECU and test system. According to the advantages of Labview and Test Stand software,the test system software,which has simple and intuitive user interface,was developed in three layers. The test results of several ECUs indicate that,the test system can complete full function test of high pressure common rail ECU,eliminate the effect of human operation on test results.