| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device of an automatic transmission for a vehicle capable of preventing gear shift of undesired drivability in occurrence of interlock. <P>SOLUTION: When the occurrence of failure causing the interlock in the automatic transmission 10 is determined, a first output port 38c and a first drain port 38a of a switch valve 36 are communicated with each other to release engagement of a hydraulic frictional engagement device released in failure, and a specific gear shift stage is established through switching control of the switch valve 36 when the occurrence of failure is determined, thus the gear shift of undesired drivability can be prevented when the failure causing the interlock in the automatic transmission 10 is determined, without hinging on the engagement of the hydraulic frictional engagement device released in occurrence of failure. <P>COPYRIGHT: (C)2007,JPO&INPIT |
