| 摘要 |
PURPOSE:To conduct speed change operation without giving a feeling of disorder to an operator and prevent troubles such as lateral turning and load scattering by controlling speed change in such a manner as to keep the speed step at that time when the center-of-gravity position of the whole vehicle is separated from its center-of-gravity position by a set value or more. CONSTITUTION:The tilt angle of a mast is detected by a working machine tilt angle detector 26, the height of a working machine 25 is detected by a working machine height detector 24, and the weight of the working machine 25 is detected by a working cylinder working pressure detector 22 when the mast is in vertical state. The weight of the vehicle body and the center-of- gravity position of the working machine 25 are known. From these numerical values, the distance from the center of gravity of the vehicle body to the center of gravity of the whole vehicle is determined, and when the distance exceeds a set value or more, the speed step at that time is kept. These calculation are conducted by a controller 29. |
