Control device for vehicle drive device

A control device of a vehicle drive device including a hydraulic power transmission device having a lockup clutch being configured to directly couple an input-side rotating element to which a power from an engine is input and an output-side rotating element outputting power to drive wheels, a first electric motor directly or indirectly coupled to the input-side rotating element, and a second electric motor directly or indirectly coupled to the drive wheels,

• the control device of a vehicle drive device being configured to have an electric path through which a power is electrically transmitted by giving/receiving electric power between the first electric motor and the second electric motor and a mechanical path through which a power is mechanically transmitted via the hydraulic power transmission device, the control device of a vehicle drive device being configured to control an operating point of the engine by adjusting a torque of the first electric motor,
• to select a transmission path with better power transmission efficiency between
• a power transmission efficiency in a first transmission path transmitting the power of the engine toward the drive wheels by using both the power transmission via the electric path and the power transmission only via fluid in the hydraulic power transmission device in the mechanical path and
• a power transmission efficiency in a second transmission path transmitting the power of the engine toward the drive wheels through power transmission when the lockup clutch of the hydraulic power transmission device is driven to perform an engagement or slip operation in the mechanical path.