| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic system capable of preventing a "breathing" phenomenon at low speed rotation of an engine, and of efficiently operating a driven member at high speed rotation of the engine. <P>SOLUTION: The hydraulic system includes a pump, a hydraulic actuator driven with the pump, the driven member driven with the hydraulic actuator, an operation means for operating the driven member, a control valve for controlling the hydraulic actuator, and a controller for controlling a spool of the control valve, the spool of the control valve is controlled in proportion to an operation amount of the operation means by a command signal outputted from the controller based on an operation signal in response to the operation amount of the operation means, and a command signal for returning the spool is outputted from the controller to the control valve, when a precursor is detected showing occurrence of insufficiency in a supply amount of pressure oil with respect to the hydraulic actuator while the driven member is operated and lowered. <P>COPYRIGHT: (C)2012,JPO&INPIT |
