Research Of Cleaning Loss Monitoring And Control For Electric Combine Harvester

The grain combine harvester is one of the important tools in the process of foodgrain production. However, the current domestic combine exist the questions of complicated operation, inefficient, serious parts abrasion and inconvenient maintenance. And there is a certain gap in both intellectualized level and control strategy. What's more, because of the impacts of advanced foreign combine in characteristics and prices, it can not suit the situation of our country. Therefore, researching and developing the high automation and intelligent grain combine of portability, minitype, cleanness, high efficiency and easy operation becomes requisite. It can improve china's foodgrain production and have a great significance in accelerating agricultural mechanization and modernization.This paper introduces the developmental situation and dynamic of cleaning loss monitoring and control for domestic and international combine harvester. Furthermore, it analyzes the meaning and market demand of development the cleaning loss monitoring and control system for the electric combine harvester with low prices, high efficiency and convenient use, maintenance and operation. Based on the analytical results, it presents the overall design concept of electric drive for combine harvester and designs overall monitoring program of the system. And that it researches the configuration of the hardware, software and anti-jamming for the system.The contents of the paper include the fllowings: the overall plan of electric drive system design for combine harvester which is to use block-driven form for momentum, the specific design of electric drive for fan; The designation of the hardware which includes the designation for the control core board of 8031 singlechip, A/D conversion board, data and program memory board, real-time clock board, keyboard and display board and so on. The collection of cleaning loss signal select piezoelectric sensor, and there are a reasonable design and simulation for the signal processing circuit. Output control passage is composed of D/A converter and transducer, completed the motor speed adjustment and eventually achieved a fan speed control; if cleaning loss exceeds the setting scope, the system also has a alarm function.In order to facilitate debugging, transplantation and modification for system, software design selects the idea of module frame and subprogram; the system selects assembly language, the designation of software which includes the designation for main program, data collection and A/D conversion subprogram, keyboard subprogram, real-time display subprogram and so on; to enhance reliability and stability of the system, this paper presents the anti-jamming hardware and software design.The components seleced in the system by taking full account of cost and performance have low cost and stable performance. The emulational results and design requirements are basically the same by simulation for the signal processing circuit.The system has great practical significance for improving combine harvester level of intelligentizing and automatization.