Control device and control method for a vehicular automatic transmission

A control method for a vehicular automatic transmission that attains a plurality of gears having different power transmission states by selectively engaging and disengaging at least one of a plurality of frictional engaging devices, and includes an engaging-force control device that controls, when selectively engaging and disengaging the at least one of the plurality of frictional engaging devices, engaging force of the selectively engaged and disengaged frictional engaging devices, the control method comprising:

• performing learning correction of the engaging force of the at least one of the plurality of frictional engaging devices based on a predetermined control parameter when performing a prescribed first gearshift between the gears, the at least one of the plurality of frictional engaging devices being selectively engaged and disengaged in the first gearshift and the engaging force of the at least one of the plurality of frictional engaging devices being controlled by the engaging-force control device in the first gearshift;
• and
• correcting the engaging force of at least one of the plurality of frictional engaging devices based on the learning correction performed in the first gearshift when performing a second gearshift from a driving gear to a non-driving gear, the at least one of the plurality of frictional engaging devices being selectively engaged and disengaged in the second gearshift and the engaging force of the at least one of the plurality of frictional engaging devices being controlled by the engaging-force control device in the second gearshift.

A control apparatus for a vehicular automatic transmission that attains a plurality of gears having different power transmission states by selectively engaging and disengaging at least one of a plurality of frictional engaging devices, comprising:

• engaging-force control means for controlling, when selectively engaging and disengaging the at least one of the plurality of frictional engaging devices, an engaging force of the selectively engaged and disengaged frictional engaging devices, and
• control means for performing learning correction of the engaging force of the at least one of the plurality of frictional engaging devices based on a predetermined control parameter when performing a prescribed first gearshift between the gears, the at least one of the plurality of frictional engaging devices being selectively engaged and disengaged and the engaging force of the at least one of the plurality of frictional engaging devices being controlled by the engaging-force control means in the first gearshift, and for correcting the engaging force of at least one of the plurality of frictional engaging devices based on said learning correction by the control means of the engaging force of the at least one of the frictional engaging devices based on the predetermined control parameter when performing the prescribed first gearshift between the gears, when performing a second gearshift from a driving gear to a non-driving gear, the at least one of the plurality of frictional engaging devices being selectively engaged and disengaged in the second gearshift and the engaging force of the at least one of the plurality of frictional engaging devices being controlled by the engaging-force control means in the second gearshift.