Patent ID: 8560195

Claim:
An automatic transmission for shifting from one gear position to another gear position by changing a state of a friction element to he engaged from a released state to an engaged state based on a shift command, comprising: a hydraulic control circuit which controls a hydraulic pressure to the friction element; a control unit electrically connected to the hydraulic control circuit and configured to: output the shift command from the one gear position to the another gear position; output a command hydraulic pressure to the hydraulic control circuit for controlling an engaging force of the friction element to be engaged based on the shift command; calculate a time rate of change of a torque at an output side of the automatic transmission; correct the command hydraulic pressure when transmission of a drive force of the friction element to be engaged is started at a time of a next shift based on a difference between the calculated time rate of change of the output-side torque and a target value; increase the command hydraulic pressure when the transmission of the drive force of the friction element to be engaged is started at the time of the next shift if the output-side torque time rate of change is larger than the target value, and decrease the command hydraulic pressure when the transmission of the drive force of the friction element to be engaged is started at the time of the next shift if the output-side torque time rate of change is smaller than the target value.