Patent ID: 7840329

Claim:
An automatic transmission comprising: an input section for receiving an input torque from a drive unit; an output section; a first frictional engagement element having an engaged state allowing the output section to rotate at a first transmission gear ratio with respect to the input section; a second frictional engagement element having an engaged state allowing the output section to rotate at a second transmission gear ratio with respect to the input section; and a controller for controlling a gear shift from the first transmission gear ratio to the second transmission gear ratio, the controller being configured to control the first and second frictional engagement elements so as to cancel at least a first portion of an inertia torque resulting from the gear shift, wherein: the gear shift is an upshift; the first frictional engagement element has a disengaged state allowing the output section to rotate at the second transmission gear ratio with respect to the input section; the second frictional engagement element has a disengaged state allowing the output section to rotate at the first transmission gear ratio with respect to the input section; and the controller is configured to control the first and second frictional engagement elements toward their respective engaged states in parallel so as to cancel the first portion of the inertia torque.