To provide a hydraulic pressure controller of a construction machinery in which a specified structure can be successfully drive-controlled corresponding to the present location in the action direction of the force of gravity, while suppressing consumed energy of a main hydraulic pump.
The controller is comprised of a boom 40 which is the specific structure in which a driving direction and the action direction of gravity may become in the same direction, and an angle sensor 15 to detect an angle θ for a rotating body of a boom cylinder 6. On driving the boom 40 in the tare weight direction, the controller is provided with an actuator control means capable of performing a first drive control to drive the boom 40 by feeding pressure oil from the main hydraulic pump 2 into the boom cylinder 6, performing a boom cylinder control followed by the first drive control, while containing a second drive control to drive the boom cylinder 6 with the tare weight without feeding pressure oil from the main pressure pump into the boom cylinder 6 corresponding to a signal output from the angle sensor 15.
Ichiro Suzuki
Hirohiro Ichimura
Kazunori Satake
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