| 摘要 |
A lifting controller of an agricultural working device is provided to prevent damage of the working device by hastening a start timing of a lifting control operation. A lifting controller of an agricultural working device includes: a lifting drive equipment connected to a driving machine to be liftable; a height detecting unit for detecting a ground height of the working device; and a calculating unit(100) for differentiating a detected value of the height detecting unit. The lifting drive equipment is controlled so as to maintain the ground height of the working machine as a set height based on the detected value of the height detecting unit and a change velocity obtained by differentiation of the calculating unit. |
