Control device for starting an internal combustion engine during a shifting operation

A control device for controlling a vehicle drive system in which an engagement device, a rotating electric machine, and a multi-stage automatic transmission are provided in a power transfer path connecting an internal combustion engine to wheels, the control device comprising:

• an electronic control unit that is configured to, when engaging the engagement device to start the internal combustion engine during a shifting operation of the multi-stage automatic transmission under a condition where a vehicle travels on a torque of the rotating electric machine with the engagement device in a disengagement state, cause a rotational speed of the rotating electric machine to change according to a predetermined first change pattern after the rotational speed of the rotating electric machine changes from a pre-shifting synchronous rotational speed in association with progress of the shifting operation until reaching a first synchronous range that is determined on the basis of a rotational speed of the internal combustion engine, the pre-shifting synchronous rotational speed being the rotational speed of the rotating electric machine in a shift speed established before the shifting operation is started,
• wherein the rotational speed of the rotating electric machine in the shift speed established after the shifting operation is completed is defined as a post-shifting synchronous rotational speed, and
• after the rotational speed of the rotating electric machine reaches the first synchronous range until an engagement command pressure for the engagement device becomes equal to a direct engagement pressure, the electronic control unit causes the rotational speeds of the internal combustion engine and the rotating electric machine to change according to a second change pattern that is set to have differential rotation relative to the post-shifting synchronous rotational speed.