Hydraulic control device, hydraulic circuit control method, and hydraulic device

A hydraulic control device for controlling a hydraulic circuit including a hydraulic actuator, a hydraulic pump that discharges hydraulic oil, and a control valve that switches between a supply state and a discharge state of hydraulic oil from the hydraulic pump to the hydraulic actuator based on an operation amount of an operation tool, the hydraulic control device comprising:

• a virtual bleed information output unit that outputs virtual bleed information indicating a state of hydraulic oil flowing through a virtual bleed circuit based on an operation amount of the operation tool, a discharge pressure of the hydraulic pump, and a preset virtual bleed characteristic that is a characteristic of the virtual bleed circuit to which the control valve and a hydraulic oil tank are assumed to be connected by a bypass line;
• a required bleed information output unit that outputs required bleed information indicating the state of hydraulic oil flowing through the virtual bleed circuit that is required to cause the hydraulic actuator to perform a desired operation based on the operation amount;
• a target control value determination unit that determines a target control value for the hydraulic pump based on a comparison result between the virtual bleed information and the required bleed information;
• and
• a pump control unit that controls the hydraulic pump based on the target control value.