Automatic position control apparatus for ground working vehicle

摘要

An automatic position control apparatus for a ground working vehicle equipped with a liftable working implement. The control apparatus is adapted to automatically control lifting and lowering of the implement so that the deviation of the draft value of the implement acutally detected by a draft detector from the draft value preset by a draft setting unit is maintained within a permissible range preset by a sensitivity setting unit. The control apparatus is characterized in that the apparatus includes a detector for detecting that the deviation is not decreasing outside the permissible range above the maximum permissible value thereof so as to automatically control the lift of the implement only while the deviation detector is in detecting operation.