Control device for vehicle driving device

A control device for a vehicle driving device which controls the vehicle driving device provided with a particular engagement device, a rotary electric machine, and a transmission apparatus disposed in a power transmission path coupling an internal combustion engine with wheels in order from the internal combustion engine side,

• wherein the transmission apparatus includes a plurality of engagement devices, and selectively forms a plurality of transmission shift stages different in transmission shift ratio according to a state of engagement of the plurality of engagement devices;
• the control device comprising:
• an electronic control unit that includes control logic, which when executed:
• executes an on upshift control for controlling engagement and release of the plurality of engagement devices to switch the transmission shift stage to a transmission shift stage smaller in the transmission shift ratio from a state in which the particular engagement device transmits a torque in a forward acceleration direction to the wheels in a direct engagement state;
• and
• controls the particular engagement device into a slip engagement state, and reduces a rotational speed of the rotary electric machine relative to a rotational speed of the internal combustion engine when decreasing a rotational speed difference between a pair of engagement members of engagement side engagement device which is the engagement device engaged for switching the transmission shift stage during execution of the on upshift control.