| 摘要 |
A reliable gear shift to a reverse gear stage by using a manual operation is allowed even if an electrical system failure occurs in a hydraulic control apparatus for an automatic transmission having a plurality of transmission gear trains. The hydraulic control apparatus performs a gear shift operation by a select actuator and a shift actuator. When the shift actuator is actuated to a neutral position, an oil pressure is supplied from a shift position detection valve 64 toward the select actuator which selects a gear shift stage switching mechanism. Next, when the oil pressure is supplied by a normally open solenoid valve, and also a reverse gear stage switching mechanism is selected, a pilot pressure is supplied from a select position detection valve to a forcible reverse shift valve, and thus one oil pressure supplied to the shift actuator is shut off. Further, when the shift actuator actuates the reverse gear stage switching mechanism, the shift position detection valve is actuated so that the oil pressure from the select position detection valve is supplied to an input clutch.
|
