Design Of Fault Diagnosis System For Diesel Engine Based On Embedded Technology

To ensure safe and reliable running of the diesel engine powered mechanical equipment, fault diagnosis system for diesel engine based on embedded technology was design in the thesis. The function of the system is engine status data collection, online fault diagnosis and alarm, status data analysis and back up. The work completed in this thesis is as follows:(1)Based on the requirement of the system, combined with GPRS wireless communication technology and the Internet, the overall design of the system was completed. The diagnostic center server, SQL2000database and application software was finished.(2)From the aspect of low cost and simple function, XC164microcontroller based vehicle diagnostic device using instantaneous speed diagnostic techniques was designed. Functions of engine status data acquisition transmission and diesel engine cylinder condition monitoring were completed.(3) Based on the system requirements, embedded Linux operating system migration was realized on the PC104module of vehicle diagnostic device. Corresponding application program was designed in the QT/E platform.(4) Diagnosis of marine diesel engine using instantaneous speed was researched. Equivalent model based on a certain type of marine diesel engine was established. At last, the thesis came to the conclusion that the low band of the instantaneous speed can be well used for diesel engine cylinder state diagnosis.System design and functions of each module were finished, system test was carried out in diesel engine factory, the results show that the system was available for diesel engine running state monitoring and analysis.