| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device of an automatic transmission for outputting a signal pressure for failure time only when a selector valve at failure time lies in a predetermined state and is changed to a failure time position. <P>SOLUTION: A clutch apply control valve 3 is changed to a left half position based on signal pressure outputted by a solenoid valve SR at a predetermined state, and line pressure PL(D) of an oil passage g1 is supplied to a hydraulic servo 7 of a brake B-1 via oil passages k1, k2, and k3.The signal pressure of the solenoid valve SR is inputted into a B-1 apply control valve 5 via an oil passage f2.When oil pressure of each of hydraulic servos 6, 7, and 8 is simultaneously inputted into the valve 5 via each of oil passages j5, l, and k4, the valve 5 is changed to a right half position, namely the failure time position, the signal pressure for failure time outputted via an oil passage f5 changes the clutch apply control valve 3 to the right half position to block the oil pressure of the hydraulic servo 7 to prevent simultaneous engagement.When the signal pressure of the solenoid valve SR is not outputted, simultaneous engagement does not occur and hence the signal pressure for failure time is not outputted. <P>COPYRIGHT: (C)2004,JPO |
