| 摘要 |
A hydraulic pressure control apparatus for a torque converter, the torque converter including a pump impeller configured to rotate, a turbine runner configured to rotate in response to fluid transmitted from the pump impeller and a lock-up clutch adapted to directly connect the turbine runner to a power source, includes a control valve outputting a lock-up pressure for engaging the lock-up clutch by controlling a hydraulic pressure outputted by a hydraulic pressure source and a relay valve including a first switching portion for selectively allowing and interrupting a communication between the control valve and the lock-up clutch, wherein the relay valve interrupts the communication between the control valve and the lock-up clutch by means of the first switching portion when a value of the lock-up pressure outputted by the control valve is a predetermined value or more.
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