| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid sudden change of tilling depth and to facilitate the return to the tilling depth control by quickening the recovery of loading factor in correcting a target tilling depth according to the loading factor. <P>SOLUTION: A control part 20 of a tractor includes a target tilling depth correcting means for preventing engine stall by correcting the target tilling depth when the loading factor L of an engine ENG exceeds a prescribed value I during the automatic tilling depth control. When the loading factor L of the engine ENG exceeds the prescribed value I, a proportional control amount T in proportion to the deviation of the current loading factor L from the target loading factor H is computed. In determining a correction value E of the target tilling depth by integrating a deviation D between the proportional control amount T and the last correction value E, the correction value E is determined by adding the deviation D to the previously integrated value K if reduction of the loading factor L is not found, and the correction value E is determined by subtracting the deviation D from the previously integrated value K if reduction of the loading factor L is found. <P>COPYRIGHT: (C)2012,JPO&INPIT |
