Patent ID: 8428834

Claim:
A control system of an automatic transmission, the automatic transmission including a stepwise variable transmission section that includes a plurality of frictional elements and establishes a desired speed by a shift change disengaging one of the plurality of frictional elements and engaging another of the plurality of frictional elements and a continuously variable transmission section that establishes a desired speed continuously, the control system making a speed change control of the continuously variable transmission section cooperate with a change of an input rotation speed of the stepwise variable transmission section, the control system configured to: judge, during the shift change of the stepwise variable transmission section, whether a delivery of a torque from one of a plurality of disengaging side frictional elements to one of a plurality of engaging side frictional elements is completed; and start the speed change control of the continuously variable transmission section upon judgment that the delivery of the torque is completed and that an inertial phase has started.