초록 ▼

A vehicle includes an engine and electric machine connected to a planetary gear, a one-way clutch, and a controller. The one-way clutch transfers torque from the planetary gear to an overdrive gear. The controller, in response to a condition requiring disengagement of the one-way clutch, increases a

A vehicle includes an engine and electric machine connected to a planetary gear, a one-way clutch, and a controller. The one-way clutch transfers torque from the planetary gear to an overdrive gear. The controller, in response to a condition requiring disengagement of the one-way clutch, increases a torque of the electric machine based on a torque command for the electric machine and the torque transferred from the planetary gear to the overdrive gear.

대표청구항 ▼

1. A vehicle comprising: an engine and electric machine connected to a planetary gear;a one-way clutch configured to transfer torque from the planetary gear to an overdrive gear; anda controller programmed to, responsive to a power demand increasing or decreasing, braking, a vehicle speed decreasing

1. A vehicle comprising: an engine and electric machine connected to a planetary gear;a one-way clutch configured to transfer torque from the planetary gear to an overdrive gear; anda controller programmed to, responsive to a power demand increasing or decreasing, braking, a vehicle speed decreasing, or an engine shutdown request, each requiring one-way clutch disengagement, increase an electric machine torque based on the torque transferred from the planetary gear to the overdrive gear. 2. The vehicle of claim 1, wherein the controller is further programmed to increase the torque of the electric machine until the torque transferred to the overdrive gear becomes zero. 3. The vehicle of claim 2, wherein the controller is further programmed to, in response to the torque transferred to the overdrive gear becoming zero, adjust a speed of the electric machine such that the one-way clutch achieves an overrunning state. 4. The vehicle of claim 3, wherein the controller is further programmed to, in response to the one-way clutch achieving the overrunning state, retract an engagement mechanism of the one-way clutch. 5. The vehicle of claim 4, wherein the controller is further programmed to, in response to retracting the engagement mechanism of the one-way clutch, exit an overdrive mode and adjust the speed of the electric machine to enter a nominal operation mode. 6. The vehicle of claim 4, wherein the one-way clutch is an electromagnetic rocker one-way clutch and wherein the controller is further programmed to, in response to the electromagnetic rocker one-way clutch being electronically deactivated, retract the rockers of the electromagnetic rocker one-way clutch. 7. A hybrid vehicle comprising: a planetary gear set including sun, carrier, and ring gears, the ring gear configured to transfer torque to a traction wheel;an engine connected to the carrier and configured to transfer torque to the planetary gear set;an overdrive gear configured to transfer torque from the engine to the traction wheel;a one-way clutch configured to transfer torque from the planetary gear set to the overdrive gear when switching between powertrain nominal and overdrive operation modes;a generator connected to the sun gear and configured to overrun the one-way clutch when rotated in a disengagement direction; anda controller programmed to, in response to a condition requiring switching from the powertrain overdrive mode to the powertrain nominal operation mode, alter a torque of the generator in the disengagement direction according to a torque command that is based on the torque transferred from the planetary gear set to the overdrive gear. 8. The vehicle of claim 7, wherein the controller is further programmed to alter the torque of the generator until the torque transferred to the overdrive gear becomes zero. 9. The vehicle of claim 8, wherein the controller is further programmed to, in response to the torque transferred to the overdrive gear becoming zero, adjust a speed of the generator such that the one-way clutch achieves an overrunning state. 10. The vehicle of claim 9, wherein the controller is further programmed to, in response to the one-way clutch achieving the overrunning state, retract an engagement mechanism of the one-way clutch. 11. The vehicle of claim 10, wherein the controller is further programmed to, in response to retracting the engagement mechanism of the one-way clutch, exit the powertrain overdrive mode and adjust the speed of the generator to enter the powertrain nominal operation mode. 12. The vehicle of claim 10, wherein the one-way clutch is an electromagnetic rocker one-way clutch and wherein the controller is further programmed to, in response to the electromagnetic rocker one-way clutch being electronically deactivated, retract the rockers of the electromagnetic rocker one-way clutch. 13. The vehicle of claim 7, wherein the condition is a decrease in power demand, an increase in power demand, braking, a decrease in vehicle speed, or an engine shutdown request. 14. A method of controlling a vehicle having an engine and an electric machine connected to a planetary gear set, and a one-way clutch configured to transfer torque from the planetary gear set to an overdrive gear, the method comprising: in response to a condition requiring disengagement of the one-way clutch, increasing a torque of the electric machine based on the torque transferred from the planetary gear set to the overdrive gear until the torque being transferred to the overdrive gear becomes zero; andin response the torque transferred to the overdrive gear becoming zero, adjusting a speed of the electric machine such that the one-way clutch achieves an overrunning state. 15. The method of claim 14 further comprising, in response to the one-way clutch achieving the overrunning state, retracting an engagement mechanism of the one-way clutch. 16. The method of claim 15, further comprising, in response to retracting the engagement mechanism of the one-way clutch, exiting an overdrive mode, and adjusting the speed of the electric machine to enter a nominal operation mode.