| 摘要 |
PROBLEM TO BE SOLVED: To provide a tractor with a rotary tiller, automatically controlling depth of furrow without leaving furrow on the ground after tilling. SOLUTION: The rotary tiller is provided with a left and right pair of ground sensors 130, 130 located between each rear wheel of the traveling body and the rotary tiller for detecting the depth of the furrow value WD by contacting with the bottom of the furrow. A tiller controller 110 calculates the depth of furrow value WD from the detected value of a ultra sonic sensor 121, a lift angle sensor 129 and the left and right contact sensor 130, and corrects the target furrowing depth value RD0 set on the furrowing depth setter 126 more than the depth of furrow value WD. COPYRIGHT: (C)2007,JPO&INPIT
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