The Study On Diagnosis Expert System Of Electronic Fuel Injection Engine

With the development of modern Electronic Fuel Injection engine, fault diagnosis of the engine became more necessary. The complexity of EF1 engine's fault diagnosis behaved as fuzzy relation between symptoms and causes and uncertainty of reasoning course as well. On-Board-Diagnosis can only be used on diagnosing simple faults of electronic control system, and general measure instruments can not diagnosis exactly because of the complexity of EFI engine's fault diagnosis. It is necessary to develop Diagnosis Expert System for EFI engine's diagnosis considering about the specialty of the EFI engine.EE-DES include four module: Diagnosis module, Knowledge base management module, learning assistant module, maintain management module and so on. User can diagnosis in two kinds mode: Diagnosis based on Diagnosis Tree , commix fuzzy reasoning based on expert's knowledge and experience.The former method emphasizes particularly on obtaining more failure information by testing and asking regularly during the process of diagnosis. In such way, the course of reasoning is optimized. Knowledge base was organized ideally by DT at the same time . By utilizing self-diagnosis method and diagnosis method based on DT, it become more convenience for fault orientation .Considering about fuzzy relation between fault causeand symptom, commix fuzzy diagnosis module was set up by means of fuzzy synthesize judge.EE-DES was implemented with Visual Basic development studio. The system realized diagnosis , knowledge acquisition, maintain management and learning assistant by friendly interface, which satisfied maintain personnel in different level.