Hydraulic control apparatus and hydraulic control method

A hydraulic control method for a hydraulic control apparatus including:

• a branch path that branches from a main passage that connects an oil pump that operates with rotation of an engine and equipment to which oil is supplied by the oil pump;
• an accumulator connected to the branch path;
• a control solenoid;
• a reference pressure chamber and a control pressure chamber;
• and
• a balance valve unit including a balance valve body and an opening compression spring that biases the balance valve body toward an opening side,
• the method comprising:
• providing a check valve for preventing backflow in an oil inlet path of the branch path, through which oil flows into the accumulator;
• providing the balance valve unit in an oil discharge path of the branch path, through which oil is discharged from the accumulator;
• and
• operating the control solenoid to introduce a high-pressure oil into the control pressure chamber such that opening of the balance valve body is suppressed by a hydraulic pressure of the high-pressure oil.