Control device and hydraulic system including the same

A control device that controls movement of a valve body of a valve device, the control device comprising:

• a flow rate obtainment unit that obtains a flow rate of the valve device;
• a flow state determination unit that determines, on the basis of a target flow rate value and the flow rate, whether or not a flow of an operating fluid in the valve device is in a transient flow state, the target flow rate value being input to the flow state determination unit, the flow rate being obtained by the flow rate obtainment unit;
• an opening command calculation unit that calculates an opening command on the basis of the target flow rate value and an upstream-downstream pressure difference of the valve device;
• and
• a valve body control unit that controls the movement of the valve body, wherein:
• when the flow state determination unit determines that the flow is not in the transient flow state, the valve body control unit controls the movement of the valve body on the basis of the opening command, and when the flow state determination unit determines that the flow is in the transient flow state, the valve body control unit controls the movement of the valve body on the basis of the target flow rate value independently of the upstream-downstream pressure difference of the valve device.