| 摘要 |
PURPOSE:To remove a delivery pressure in its overshoot and undershoot from a pump main unit by adding an output or an inverted output from a differentiating circuit as one part of an output from a control circuit. CONSTITUTION:A control device for a variable displacement pump has a control circuit 13 which supplies as a control signal to a solenoid 15 of a solenoid valve 10, for controlling a pump main unit 1 in its delivery flow quantity, a signal in accordance with a deviation between a detection signal from a detector 6, detecting the pump main unit 1 in its delivery pressure, and a preset signal from an external setter 14. The control circuit 13 provides a differentiating circuit 20, and its output or inverted output is added as one part of an output from the control circuit 13. Accordingly, the pump main unit 1 suppresses a rapid change in its delivery pressure, removing its overshoot and undershoot. |
