| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a closed hydraulic circuit system configured to determine a state of a hydraulic pump even when an operation environment of the hydraulic pump changes. <P>SOLUTION: This closed hydraulic circuit system 100 for driving a hydraulic cylinder 3 having a first port 3b and a second port 3c, includes: a hydraulic pump 1 having a first pump port 1a fluidly communicating with the first port 3b via a first pipe conduit C1 and a second pump port 1b fluidly communicating with the second port 3c via a second pipe conduit C2; an electric motor 2 for controlling rotation of the hydraulic pump 1; an electric motor control part 11 for feed-back controlling an input value of the electric motor 2 on the basis of an output value of the electric motor 2; and a pump state determining part 13 for determining the state of the hydraulic pump 1 on the basis of the input value of the electric motor 2 and the output value of the electric motor 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
