| 摘要 |
PURPOSE:To prevent deep plowing in starting tillage by decreasing the set plowing depth in starting the tillage in plowing depth control. CONSTITUTION:Plowing depth control is carried out from a higher position of a tiller in starting tillage by a CPU 15 based on detection with a plowing depth sensor 2 using a shallower plowing depth than a given plowing depth set by a position setter 27 as the target by hydraulic operation. When the plowing depth attains a shallow value, plowing depth control is performed by the given plowing depth. When a car body is advanced, control for keeping the given plowing depth is carried out. As a result, since the position of expanded and softened after the tiller can be detected in starting the forward tillage, a greater plowing depth than that required is not provided.
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