关键词: 车载控制器；诊断；故障循环显示码；硬件在环

Abstract: In contemporary automotive diagnostics, technicians and engineers predominantly rely on a two-pronged approach involving fault code retrieval via diagnostic tools and subsequent analysis of controller area network (CAN) bus signals to identify malfunction sources. However, this conventional methodology frequently results in operational inefficiencies. To address this challenge, this study presents an innovative rapid fault diagnosis framework for vehicle controler. First, an automotive open system architecture (AUTOSAR) compliant fault diagnosis application layer architecture is systematically designed for controllers. Second, a novel fault codes displayed in a loop is developed, enabling controller to autonomously broadcast detected fault identifiers through the vehicular CAN network at configurable intervals. Finally, the system's efficacy is rigorously validated using hardware-in-the-loop (HIL) simulation platforms. Experimental results demonstrate that this optimized diagnostic scheme eliminates the time-consuming process of manual signal correlation analysis based on control logic principles. The implementation significantly accelerating both R&D debugging cycles and maintenance operations. This research establishes a methodological foundation for next-generation intelligent fault diagnosis systems in automotive embedded controllers.

Key words: vehicle controller; diagnosis; fault codes displayed in a loop; HIL