| 摘要 |
PROBLEM TO BE SOLVED: To provide a new and improved control device of a hydraulic circuit and a control method of the hydraulic circuit, capable of controlling a variable capacity pump to have a discharge pressure suitable for a control input of an actuator in a virtual bleed-off hydraulic system.SOLUTION: A control device of a hydraulic circuit includes a virtual discharge flow rate setting portion for setting a virtual discharge flow rate of a variable capacity pump on the basis of a control input to a direction control valve, a bleed-off flow rate calculating portion for calculating virtual bleed-off flow rates from all of the direction control valves on the basis of the control inputs to the direction control valves, and a pump control portion determining a virtual discharge pressure on the basis of the difference obtained by subtracting the total estimated actuator flow rate and the bleed-off flow rate as the estimated flow rate to all of the actuators from the virtual discharge flow rate, and controlling the variable capacity pump on the basis of the virtual discharge pressure.SELECTED DRAWING: Figure 3 |
