| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems in the level control of a working vehicle comprising the generation of hunting in the case of narrowing the width of neutral zone in order to increase the sensitivity of control and the generation of oscillation having long period caused by the gentle undulation of the field surface to apply uncomfortable feeling to the worker in the case of increasing the neutral zone width. SOLUTION: In a working vehicle, etc., having an inclination detecting means 2 to detect the inclination of the body 1, the inclination angle of the body 1 caused by the gentle undulation and local unevenness on the surface of the traveling field is detected by the inclination detecting means 2, a low-frequency signal W caused by the gentle undulation is extracted from the detected inclination signal and the width of neutral zone N in the level control of the body 1 is set to be smaller than the amplitude of the low-frequency signal W.
|
