Development of a Trailer-Mounted Mechanical Drawbar Control System for a Tractor-Trailer Combination Operation in Greenhouse

  • ALCARAZ Joel M.
    The Japanese Society of Agricultural Machinery United Graduate School of Agricultural Sciences, Ehime University
  • YAMASHITA Jun
    The Japanese Society of Agricultural Machinery Faculty of Agriculture, Ehime University
  • SATO Kazunobu
    Tokushima College of Technology The Japanese Society of Agricultural Machinery

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Other Title
  • 機械式けん引制御システム搭載の植物工場用トレーラ車両の開発

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Abstract

A prototype trailer-mounted mechanical drawbar control system was developed to facilitate the operation of a tractor-trailer combination (TTC) in greenhouse. It was designed to solve the problems of jackknifing and zigzagging of the TTC when driving in a reverse direction and the large turning radius on sharp curves and narrow roads when going forward. The prototype performance was compared to the conventional drawbar hitching system. The results showed that it attained a straight reverse direction at a minimal yaw rate of 0.025-0.05deg/s while the conventional system was observed to be on zigzag path when controlling the steering wheel and jackknifed when steadily held. A reduction in the turning radius and TTC track width of 16 and 20%, respectively, were attained for a 360 degree turn at a maximum tractor steering angle of 42 degrees.

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