VEHICLE DRIVING SYSTEM

To provide a vehicle driving system capable of shortening the time required for operation mode transition accompanying the start of an internal combustion engine.SOLUTION: A control device controls an internal combustion engine, a first rotary electric machine, a first engagement device, and a second engagement device. The control device can execute a first transition control in the case of transition from a first mode to a second mode. The first transition control includes: a first control which causes the second engagement device for connecting/disconnecting power transmission between two rotary elements selected from three rotary elements of a distributing differential gear mechanism, to change from an engaged state into a disengaged state while maintaining the third engagement device of a transmission mechanism to be in an engaged state; a second control which controls, after the first control, a rotational speed of a rotor so that a rotational speed N1 of the first rotary element approaches a target rotational speed Nt; and a third control which changes, after the second control, the first engagement device for connecting/disconnecting power transmission between an input member and the first rotary element from the disengaged state into the engaged state, and starts the internal combustion engine by driving force transmitted from the first rotating electric machine to the internal combustion engine via the first engagement device.SELECTED DRAWING: Figure 12 【課題】内燃機関の始動を伴う動作モードの移行に要する時間を短く抑えることができる車両用駆動装置を提供する。【解決手段】内燃機関、第１回転電機、第１係合装置、及び第２係合装置を制御する制御装置は、第１モードから第２モードに移行する場合に、第１移行制御を実行可能であり、第１移行制御は、伝達機構の第３係合装置を係合状態に維持しつつ、分配用差動歯車機構の３つの回転要素のうちから選択される２つの間の動力伝達を断接する第２係合装置を係合状態から解放状態に変化させる第１制御と、第１制御の後に、第１回転要素の回転速度Ｎ１が目標回転速度Ｎｔに近付くようにロータの回転速度を制御する第２制御と、第２制御の後に、入力部材と第１回転要素との間の動力伝達を断接する第１係合装置を解放状態から係合状態に変化させ、第１係合装置を介して第１回転電機から内燃機関に伝達される駆動力により内燃機関を始動させる第３制御と、を含む。【選択図】図１２