| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device of a working machine that carries out a relief cutoff control using a plurality of maps. <P>SOLUTION: The hydraulic control device of a working machine includes an engine, at least one variable displacement pump that can be driven by the engine and can vary a swash plate angle by a command from a controller, and a plurality of actuators that can be driven by the discharge from the variable displacement pump, and carries out a relief cutoff control in such a manner that when the pump discharge pressure of the variable displacement pump reaches the highest pressure, the controller regulates a pump discharge flow rate to the actuators. The controller includes a plurality of prestored maps that set characteristics of the pump discharge pressure and of the pump discharge flow rate for the relief cutoff control, in which any map can be optionally selected. <P>COPYRIGHT: (C)2012,JPO&INPIT |
