CONTROLLER FOR AUTOMATIC STEERING OF TRACTOR

摘要

PURPOSE:To smoothly control automatic steering independently of the traveling speed of a tractor by taking out the driving force of a steering mechanism at the control of automatic steering directly from a travel driving shaft. CONSTITUTION:A rotational angle of a front wheel 14 is detected by a wheel angle sensor 15 and the detected output is applied to one input terminal of a differential amplifier 21 through an analog operation circuit 19 of the wheel angle sensor. A signal in proportion to the shift length from the border of a tractor 5 is applied to the other input terminal of the differential amplifier 21. An output from the differential amplifier 21 is transmitted to a digital controlling circuit 23 through an AD converter 22. The output of the digital controlling circuit 23 is applied to a drive switching electromagnetic clutch 18 as a driving signal and the front wheel 14 is rotated in the direction to correct the shift from the border.