Hydraulic control device

A hydraulic control device which is configured to control an object to be controlled by an oil pressure, the hydraulic control device comprising:

• an oil pump having a first discharge port and a second discharge port;
• an input side oil passage through which oil suctioned from an oil tank to the oil pump passes;
• a first output side oil passage which connects the first discharge port and the object to be controlled and into which the oil discharged through the first discharge port flows and which supplies the oil pressure to the object to be controlled;
• a second output side oil passage into which the oil discharged through the second discharge port flows;
• a first connection oil passage through which the first output side oil passage and the second output side oil passage are connected;
• a second connection oil passage through which the second output side oil passage and the input side oil passage are connected;
• a first valve device provided in the first connection oil passage;
• a second valve device provided in the second connection oil passage;
• and
• a third connection oil passage in which the second valve device is connected to a portion of the first output side oil passage between a portion to which the first connection connected and the object to be controlled,
• wherein the first valve device
• is brought into an open state in which oil in the first connection oil passage is allowed to flow from the second output side oil passage to the first output side oil passage when a first value obtained by subtracting a value of a first output oil pressure in a portion in the first output side oil passage to which the first connection oil passage is connected from a value of a second output oil pressure in a portion in the second output side oil passage to which the first connection oil passage is connected is equal to or larger than a first threshold value greater than 0, and
• is brought into a closed state in which a flow of the oil in the first connection oil passage between the second output side oil passage and the first output side oil passage is cut off when the first value is smaller than the first threshold value,
• the second valve device
• is brought into an open state in which the oil in the second connection oil passage is allowed to flow from the second output side oil passage to the input side oil passage when an oil pressure in the third connection oil passage is equal to or larger than a second threshold value, and
• is brought into a closed state in which a flow of the oil in the second connection oil passage between the second output side oil passage and the input side oil passage is cut off when the oil pressure in the third connection oil passage is smaller than the second threshold value, and
• the first value is equal to or larger than the first threshold value and the first valve device is in the open state when the second valve device is in the closed state.