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A control device for a vehicle power transmission device including an electrical differential motion portion in which a differential state between input shaft rotation speed and output shaft rotation speed is controlled through control of the operation state of an electric motor linked to a rotating

A control device for a vehicle power transmission device including an electrical differential motion portion in which a differential state between input shaft rotation speed and output shaft rotation speed is controlled through control of the operation state of an electric motor linked to a rotating element of a differential motion portion, and a power connection-disconnection device constituting a portion of a power transmission path, includes a controller that lessens a transmission capacity of the power connection-disconnection device if during a switch of the state of the vehicle power transmission device from a non-driving state to a driving state, a change in input torque to the vehicle power transmission device occurs, in comparison with when the change in the input torque does not occur. Therefore, the control device reduces the shift shock when the vehicle power transmission device is switched from the non-driving to the driving state.

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What is claimed is: 1. A control device for a vehicle power transmission device including an electrical differential motion portion in which a differential state between an input shaft rotation speed and an output shaft rotation speed is controlled through control of an operation state of an electr

What is claimed is: 1. A control device for a vehicle power transmission device including an electrical differential motion portion in which a differential state between an input shaft rotation speed and an output shaft rotation speed is controlled through control of an operation state of an electric motor linked to a rotating element of a differential motion portion, and a power connection-disconnection device constituting a portion of a power transmission path, comprising a controller that lessens a transmission capacity of the power connection-disconnection device if during a switch of a state of the vehicle power transmission device from a non-driving state to a driving state, a change in input torque to the vehicle power transmission device occurs, in comparison with when the change in the input torque does not occur. 2. The control device according to claim 1, wherein the change in the input torque is due to start-up of an engine. 3. The control device according to claim 1, wherein the change in the input torque is due to stop of an engine. 4. The control device according to claim 1, wherein the change in the input torque is due to a charging control of an electricity storage device. 5. The control device according to claim 1, wherein the change in the input torque is due to a discharging control of an electricity storage device. 6. The control device according to claim 1, further comprising a vehicle start intention determination device that determines degree of a driver's intention to start a vehicle, wherein if the degree of the driver's intention to start the vehicle determined by the vehicle start intention determination device is low, the controller lessens the transmission capacity of the power connection-disconnection device when the change in the input torque to the vehicle power transmission device occurs during the switch of the state of the vehicle power transmission device from the non-driving state to the driving state in comparison with when the change in the input torque does not occur. 7. The control device according to claim 1, further comprising a vehicle speed-related value detection device that detects a vehicle speed-related value regarding vehicle speed of a vehicle, wherein if the vehicle speed-related value detected by the vehicle speed-related value detection device is less than or equal to a predetermined value, the controller lessens the transmission capacity of the power connection-disconnection device when the change in the input torque to the vehicle power transmission device occurs during the switch of the state of the vehicle power transmission device from the non-driving state to the driving state in comparison with when the change in the input torque does not occur. 8. The control device according to claim 1, wherein the electrical differential motion portion operates as a continuously variable transmission when the operation state of the electric motor is controlled. 9. The control device according to claim 1, wherein the vehicle power transmission device comprises a ratio shift portion that constitutes a portion of the power transmission path, and the power connection-disconnection device is an engagement element that constitutes the ratio shift portion. 10. The control device according to claim 9, wherein the ratio shift portion is a stepped ratio transmission. 11. A control device for a vehicle power transmission device including an electrical differential motion portion in which a differential state between an input shaft rotation speed and an output shaft rotation speed is controlled through control of an operation state of an electric motor linked to a rotating element of a differential motion portion, and a power connection-disconnection device constituting a portion of a power transmission path, comprising a controller that delays start of connection by the power connection-disconnection device if during a switch of a state of the vehicle power transmission device from a non-driving state to a driving state, a change in input torque to the vehicle power transmission device occurs, in comparison with when the change in the input torque does not occur. 12. The control device according to claim 11, wherein the change in the input torque is due to start-up of an engine. 13. The control device according to claim 11, wherein the change in the input torque is due to stop of an engine. 14. The control device according to claim 11, wherein the change in the input torque is due to a charging control of an electricity storage device. 15. The control device according to claim 11, wherein the change in the input torque is due to a discharging control of an electricity storage device. 16. The control device according to claim 11, further comprising a vehicle start intention determination device that determines degree of a driver's intention to start a vehicle, wherein if the degree of the driver's intention to start the vehicle determined by the vehicle start intention determination device is low, the controller delays start of connection by the power connection-disconnection device in a case where the change in the input torque to the vehicle power transmission device occurs during the switch of the state of the vehicle power transmission device from the non-driving state to the driving state, in comparison with when the change in the input torque does not occur. 17. The control device according to claim 11, further comprising a vehicle speed-related value detection device that detects a vehicle speed-related value regarding vehicle speed of a vehicle, wherein if the vehicle speed-related value detected by the vehicle speed-related value detection device is less than or equal to a predetermined value, the controller delays start of connection by the power connection-disconnection device in a case where the change in the input torque to the vehicle power transmission device occurs during the switch of the state of the vehicle power transmission device from the non-driving state to the driving state, in comparison with when the change in the input torque does not occur. 18. The control device according to claim 11, wherein the electrical differential motion portion operates as a continuously variable transmission when the operation state of the electric motor is controlled. 19. The control device according to claim 11, wherein the vehicle power transmission device comprises a ratio shift portion that constitutes a portion of the power transmission path, and the power connection-disconnection device is an engagement element that constitutes the ratio shift portion. 20. The control device according to claim 19, wherein the ratio shift portion is a stepped ratio transmission.