PROBLEM TO BE SOLVED: To provide a plowing depth-regulating device having a simple structure and capable of aiming at the stabilization of lifting control of a plower irrespective to the size of a deviation between a detected plowing depth position and set plowing depth position, and also capable of aiming at the stabilization of lifting control of the plowing device even in the case of having continuous disturbing inputs.SOLUTION: This plowing depth-regulating device constituted so as to perform an automatic plowing depth regulation for making the detected plowing depth position hD follow the set plowing depth position hR of the plower 400 joined with a vehicle main body 50 as freely being lifted up and down based on the rotation angle of a rear cover 624 is constituted so as to change a regulation gain Kp in the automatic plowing depth regulation based on the size of deviation &Deltah between the detected plowing depth position hD and the set plowing depth position hR.COPYRIGHT: (C)2007,JPO&INPIT【課題】検出耕深位置と設定耕深位置との偏差の大小に拘わらず、耕耘機の昇降制御の安定化を図り得る耕深制御装置、及び持続的な外乱の入力があった場合であっても、耕耘機の昇降制御の安定化を図り得る構造簡単な耕深制御装置を提供する。【解決手段】リヤカバー624の回動角度に基づき、車輌本体50に対して昇降可能に連結された耕耘機400の検出耕深位置hDを設定耕深位置hRに追従させる自動耕深制御を行うように構成された耕深制御装置は、検出耕深位置hDと設定耕深位置hRとの偏差Δhの大きさに基づき自動耕深制御における制御ゲインKpを変更するように構成されている。【選択図】図11
