AUTOMATIC TRANSMISSION EQUIPPED WITH FRICTION ELEMENT HAVING LOCKING MECHANISM ATTACHED THERETO, AND CONTROL METHOD THEREFOR

摘要

A transmission controller performs engagement processing, where a forward clutch is engaged and a lock mechanism is brought into a locked state by supplying an ON-pressure to an ON-pressure piston chamber and where the hydraulic pressure of the ON-pressure piston chamber is lowered, and supplies the ON-pressure to the ON-pressure piston chamber when the forward clutch slips even though the forward clutch has been engaged in the engagement processing, while a vehicle is traveling.

主权项

1. An automatic transmission comprising:
a friction element which is arranged in a power transmission path and in which a lock mechanism is brought into a locked state when an ON-pressure is supplied to an engagement-side oil chamber and in which an engaged state is maintained even if a hydraulic pressure of the engagement-side oil chamber is lowered when the lock mechanism has been brought into the locked state; and a control device, which performs engagement processing where the friction element is engaged and the lock mechanism is brought into the locked state by supplying the ON-pressure to the engagement-side oil chamber and where the hydraulic pressure of the engagement-side oil chamber is lowered, and which supplies the ON-pressure to the engagement-side oil chamber when the friction element slips even though the friction element has been engaged in the engagement processing, while a vehicle is traveling.