Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Stability evaluation of a proportional valve controller for forward-reverse power shuttle control of agricultural tractors

  • Jeon, Hyeon-Ho (Department of Smart Agricultural Systems, Chungnam National University) ;
  • Kim, Taek-Jin (Research and Development Institute, TYM Co., Ltd.) ;
  • Kim, Wan-Soo (Institute of Agricultural Science, Chungnam National University) ;
  • Kim, Yeon-Soo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Choi, Chang-Hyun (Department of Bio-Mechatronics Engineering, Sungkyunkwan University) ;
  • Kim, Yong-Hyeon (Gint Co., Ltd.) ;
  • Kim, Yong-Joo (Department of Smart Agricultural Systems, Chungnam National University)
  • Received : 2021.06.28
  • Accepted : 2021.08.18
  • Published : 2021.09.01
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Abstract

Due to the characteristics of the farmland in Korea, forward and reverse shift is the most used. The fatigue of farmers is caused by forward and reverse shifting with a manual transmission. Therefore, it is necessary to improve the convenience of forward and backward shifting. This study was a basic study on the development of a current control system for forward and reverse shifting of agricultural tractors using proportional control valves and a controller. A test bench was fabricated to evaluate the current control accuracy of the control system, and the stability of the controller was evaluated through CPU (central processing unit) load measurements. A controller was selected to evaluate the stability of the proportional valve controller. The stability evaluation was performed by comparing and analyzing the command current of the controller and the actual current measured. The command current was measured using a CAN (controller area network) communication device and DAQ (data acquisition). The actual current was measured with a current probe and an oscilloscope. The control system and stability evaluation was performed by measuring the CPU load on the controller during control operations. The average load factor was 12.27%, and when 5 tasks were applied, it was shown to be 70.65%. This figure was lower than the CPU limit of 74.34%, when 5 tasks were applied and was judged to be a stable system.

Keywords

Acknowledgement

본 논문은 농림축산식품부의 재원으로 농림식품기술기획평가원의 첨단농기계산업화기술개발사업(321062-02) 및 첨단생산기술개발사업(319041-03)의 지원을 받아 연구되었음.

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