Hydraulic control device

A hydraulic control device that controls a hydraulic pressure for a torque converter with a lock-up clutch having a circulation oil chamber for circulation of hydraulic oil within a converter body and an engagement oil chamber for engagement of the lock-up clutch using a pressure difference between a supplied hydraulic pressure and the hydraulic pressure within the circulation oil chamber, comprising:

• a circulation input oil passage connected to a circulation input port through which a circulation pressure is input to the circulation oil chamber;
• a circulation output oil passage connected to a circulation output port through which the circulation pressure is output from the circulation oil chamber;
• an engagement oil passage connected to an engagement port through which an engagement pressure is input to and output from the engagement oil chamber;
• a pressure regulation valve that receives and regulates a source pressure to output the regulated pressure;
• a first output oil passage connected to an output port of the pressure regulation valve;
• a second output oil passage connected to the output port of the pressure regulation valve;
• a switcher that switches between a first state in which connection between the engagement oil passage and the first output oil passage is allowed and connection between the circulation input oil passage and the second output oil passage is allowed, and a second state in which connection between the engagement oil passage and the first output oil passage is blocked and connection between the circulation input oil passage and the second output oil passage is blocked;
• an orifice formed in the second output oil passage;
• a pump that generates a hydraulic pressure using power of a motor;
• a hydraulic pressure generator that generates a line pressure that is high and a secondary pressure that is lower than the line pressure on the basis of the hydraulic pressure generated by the pump;
• a line pressure oil passage supplied with the line pressure;
• and
• a secondary pressure oil passage supplied with the secondary pressure, wherein:
• an input port of the pressure regulation valve is connected to the line pressure oil passage;
• and
• the switcher further blocks connection between the secondary pressure oil passage and the circulation input oil passage in the first state, and further allows connection between the secondary pressure oil passage and the circulation input oil passage in the second state.