Abstract
In view of the complicated hydraulic system, the many driving parts and the great load variation in the combine harvester, and on-line monitoring methods of hydraulic actuating parts such as cutting tables, conveyors and threshing drums were studied. By analyzing the working principle of the hydraulic system of the combine harvester, a mathematical model of the hydraulic system of the combine harvester was established; a simulation model for the fault diagnosis of the hydraulic system of the combine harvester was established based on AMESim. The load signal was introduced to simulate the feeding amount, and the simulation test was carried out. According to the simulation analysis results, the best position of each monitoring point was determined. The on-line monitoring system of the hydraulic actuators of the combine harvester was designed by using LabView, which can collect and display the working parameters of the main working parts of a combine harvester in real time, and alarm the user to faulty working conditions. The field experiment results show that the function and precision of the monitoring system completely meet the requirements of field operation condition monitoring of combine harvesters. The accuracy rate of the fault alarm is 96.5%, and the automatic diagnosis time of the fault alarm is less than 1 min and 18 s, which greatly improves the operation efficiency of the combine harvester.
Highlights
The executing parts of the hydraulic system of the combine harvester are mainly composed of a cutting table, rotary wheel, conveyor and threshing drum
The parameter changes of the main working parts were observed, and we found that with the increase in feeding amount, the torque of the header auger, conveying chute and threshing drum increased gradually from the initial value of 0, and their respective rotating speeds slightly decreased, but still maintained the best operation state
The on-line monitoring system of a combine harvester hydraulic actuator studied in this paper solves the shortcomings of low alarm accuracy and long fault diagnosis time of the existing monitoring system, ensures the real-time monitoring of combine harvester operation processes, quickly solves operation faults, and improves operation efficiency and quality
Summary
The executing parts of the hydraulic system of the combine harvester are mainly composed of a cutting table, rotary wheel, conveyor and threshing drum. The working status of each part has a direct impact on the operating performance of the combine harvester [1,2,3]. Most of the performance monitoring of combine harvesters in China adopts the form of single-parameter instrument monitoring, and the monitoring objects mainly include walking speed, engine working condition, feeding amount, etc. The Green Star system developed by John Deere realizes the real-time on-line monitoring of the working speed, feeding amount, threshing rate and working status of working parts [5,6]. The AFS system developed by Case New Holland can monitor crop quality, threshing rate and grain moisture content in real time and form a yield graph [7,8].
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