Abstract: A control device that controls an internal combustion engine, a first rotary electric machine, a first engagement device, and a second engagement device performing first transition control when transition is performed from a first mode to a second mode. The first transition control includes first control, second control, and third control. The first control is control in which the second engagement device that connects and disconnects power transmission between two rotary elements selected from among three rotary elements of a distribution differential gear mechanism is changed from an engaged state to a disengaged state while a third engagement device of a transmission mechanism is maintained in an engaged state. The second control controls a rotational speed of the first rotary element to is changed from a disengaged state to an engaged state and the internal combustion engine is started by using drive power transmitted from the first rotary electric.

Abstract: A distribution differential gear mechanism includes a first rotation element drivingly connected to input member, a second rotation element drivingly connected to output member, and a third rotation element drivingly connected to rotary electric machine.

Abstract: A vehicle drive device includes a first drive unit that drives first wheels; a second drive unit that drives second wheels; and a control device. When the state of charge of an electrical storage device is less than a first threshold value and a vehicle speed is less than a second threshold value, the control device performs control such that when the vehicle speed is greater than or equal to zero and required drive power is greater than or equal to zero, the operating mode of the first drive unit is set to a second mode to output the required drive power from the second drive unit, and when the vehicle speed is greater than zero and the required drive power is less than zero, the operating mode of the first drive unit is set to a first mode so the first drive power source can generate electric power.

Abstract: When it is determined that predicted required drive power (Tf) which is drive power predicted to be required for a vehicle is greater than a first threshold value (TH1) set within a range of drive power that can be outputted in a second mode, or when actual required drive power (Ta) is greater than the first threshold value (TH1), a control device (10) sets an operating mode to a first mode in which a first engagement device (CL1) is brought into an engaged state and a second engagement device (CL2) is brought into a disengaged state, to control a rotating electrical machine (MG1) and an internal combustion engine (EG) to output the actual required drive power (Ta). In other cases, the control device (10) sets the operating mode to the second mode in which the first engagement device (CLl) is brought into a disengaged state and the second engagement device (CL2) is brought into an engaged state, to control the rotating electrical machine (MGl) to output the actual required drive power (Ta).

Abstract: A vehicle drive device includes a first drive unit that drives first wheels; a second drive unit that drives second wheels; and a control device. When the state of charge of an electrical storage device is less than a first threshold value and a vehicle speed is less than a second threshold value, the control device performs control such that when the vehicle speed is greater than or equal to zero and required drive power is greater than or equal to zero, the operating mode of the first drive unit is set to a second mode to output the required drive power from the second drive unit, and when the vehicle speed is greater than zero and the required drive power is less than zero, the operating mode of the first drive unit is set to a first mode so the first drive power source can generate electric power.