Patent ID: 7503875

Claim:
A non-synchronous gear ratio shift control for a multiple-ratio automatic transmission in a powertrain for an automotive vehicle, the transmission including gearing defining multiple torque flow paths from a transmission input torque source to a transmission torque output member, first torque establishing element and second pressure activated torque establishing element for selectively establishing, respectively, a first gear configuration with a low speed ratio and a second gear configuration with a higher speed ratio during a ratio upshift event; a non-synchronous ratio upshift being characterized by a preparatory phase followed by a torque phase; the first torque establishing element being an overrunning or one-way coupling whereby the upshift event is non-synchronous; a controller for increasing transmission input torque during the torque phase as torque capacity of the second torque establishing element is increased during the torque phase; the torque phase being followed by an inertia phase; and a controller for reducing torque from the transmission input torque source during the inertia phase.