Research On Jam Fault Monitoring System For Combine Harvester

Combine harvester, which serves as the main harvesting machine, has a rapid development in recent years. But the general level of electronization and automatization of national combine harvesters is low. The problems, such as high fault rate, low efficiency and reliability, prevent the development and application of the combine harvester. Considering the high jam fault rate of the threshing roller, a jam fault monitoring system, especially an early warning and real time warning monitoring system is of great significant for promoting the development of combine harvester monitoring technology and the modernization of agriculture.This work is supported by National Science and Technology Supporting Plan, and the combine harvester, with the type of 4LZ-2.0Bilang Huzhou200 produced by Zhongji Nanfang Machinery Limited Company, is selected as the research object. The thesis analyzed the power consumption model of threshing roller and the factors leading to jam fault. Then, according to the research of current situation of jam fault monitoring system of combine harvester in and out of abroad, the thesis sets down the schematic design of the jam fault early warning and warning monitoring system, and designes the data acquisition system. Based on the data analyzing results acquired from lab and field experiments, the thesis proposes the jam fault diagnosis algorithm. Finally, the corresponding hardware and software of the monitoring system has been developed. The performances of the prototype have been experimentally verified through field harvesting of wheat and rice. The designed system also has the features of sound and light alarming, liquid crystal displaying and CAN communication.The main research of this thesis includes:1. Analyzing the jam fault of the threshing roller of the combine harvester.2. Performing the schematic design of the jam fault early warning and warning monitoring system.3. Designing the data acquisition system, extracting the eigenvectors of the jam fault and determining the fault diagnostic scheme.4. Designing the early warning and warning monitoring device based on single chip C8051F020. Mainly includes: master control circuit, signal processing circuit, power circuit, peripheral interface circuit, sound and light alarming circuit, LCD circuit and CAN bus interface circuit etc.5. Designing the system software which mainly contains system main program, data acquisition subprogram and eigenvector extracting subprogram, early warning and warning subprograms, LCD subprogram and CAN communication subprogram.6. Establishing and implementing the field experimental plan.