Hydraulic controller for automatic transmission having automatic manual control and automatic failsafe operation

A hydraulic controller for an automatic transmission, for use in a vehicle, which switches and controls engagement and disengagement of a plurality of friction engaging elements provided within the automatic transmission to implement speed change control by selecting one of a plurality of speed change positions by switching oil passages selectively connectable to respective ones of said friction engaging elements, said hydraulic controller comprising:

• an integrated valve which integrates a plurality of hydraulic valves for switching the oil passages selectively connectable to the respective friction engaging elements;
• valve switching means for switching said plurality of hydraulic valves directly and simultaneously;
• automatic hydraulic valve switching means for automatically driving and controlling said valve switching means responsive to a driving controller which controls driving of said vehicle;
• manual hydraulic valve switching means for manually driving and controlling said valve switching means;
• determining means for determining whether a speed change control is normal;
• and
• fail-safe positioning means for positioning said hydraulic valves to a preset fail-safe position when said determining means determines that the speed change control is in a fail state, wherein said preset fail-safe position is near a fastest speed position of the plurality of speed change positions and throttles said oil passages to respective friction engaging elements in said fastest speed change position.

A hydraulic controller for an automatic transmission which switches and controls engagement and disengagement of a plurality of friction engaging elements provided within the automatic transmission by selecting one of a plurality of speed change positions by switching oil passages selectively connected to respective ones of said friction engaging elements, said hydraulic controller comprising:

• a plurality of valve plates including oil passages selectively connectable to said respective friction engaging elements, and respective communicating passages for providing line pressure to maintain engagement of said friction engaging elements, providing engagement pressure for engaging said friction engaging elements, and providing drain pressure for disengaging said friction engaging elements;
• a cylindrical rotary spool including a plurality of communicating passages on an outer periphery of said cylindrical rotary spool for switching the oil passages selectively connectable to respective friction engaging elements;
• a cylindrical sleeve fittingly disposed between at least one of said valve plates and said rotary spool for switching the oil passages selectively connectable to the respective friction engaging elements;
• automatic oil passage switching means for automatically driving and controlling the oil passage switching of said rotary spool;
• and
• manual oil passage switching means for switching and controlling the oil passages by manually driving and controlling said sleeve.