Patent ID: 7785231
Filing Date: 2010-08-31
Classification: F16H,Y10T

Abstract:
1. In an automatic transmission for a vehicle that establishes a plurality of gears having different gear ratios by selectively engaging a plurality of engaging elements and a one-way clutch, a gear shift controlling apparatus of the automatic transmission for a vehicle that performs gear-shifting by disengaging the disengaged-side engaging element and by engaging the one-way clutch from a disengaged condition when the vehicle speed is reduced; comprising; a synchronization-time engagement pressure correcting device that, before synchronization of gear-shifting, makes an increase correction of an engagement pressure of the disengaged-side engaging element by a first prescribed amount, to cause an input shaft rotational speed immediately before synchronizing of the automatic transmission to approach a rotational speed calculated by multiplying an output shaft rotational speed by a gear ratio of a gear after gear-shifting the automatic transmission; and a deceleration intent determining device that determines whether a driver intends to decelerate during gear-shifting, wherein after the synchronization-time engagement pressure correcting device performs the increase correction of the engagement pressure of the disengaged-side engaging element, in a case in which the deceleration intent determining device determines that the driver no longer intends to decelerate, the synchronization-time engagement pressure correcting device continuously reduces the engagement pressure of the disengaged-side engaging element to cause disengagement of the disengaged-side engaging element.