Research on Vehicle ECU Application Program Update System Based on SAE J1939 Protocol

Abstract

Aiming at the problems of cumbersome update operation, high hardware cost, complicated protocol design, and inability to roll back if the update fails, a set of automotive electronic control unit ECU application update system was developed. The software of the upper computer update control platform was developed, and the target ECU was realized based on the STM32 controller. The system structure mode was designed as the client-server mode, and the two ends of the system were connected through the USB-CAN adapter to realize the real-time communication of the system. Based on the startup control program and the In Application Programmable (IAP) method, the target ECU Flash programming was carried out to realize the convenient update operation. Handshake communication, packet serial number verification, retransmission, application storage partition and other designs realize stable and reliable communication process, and updates can be rolled back.