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US 7,503,871 B2Granted
Strategy for improving shift quality in a hybrid electric vehicle powertrain
AssigneeFord Global Technologies, LLC
InventorsShailesh Kozarekar, Stephen Burke
Life of this patent
Estimating the term…
Abstract
The hybrid electric vehicle powertrain includes an internal combustion engine and two electric machines, one electric machine being connected directly to an engine power output shaft and to a multiple-ratio transmission power input shaft. A second electric machine powers front vehicle traction wheels as the engine powers rear traction wheels during a transmission shift interval.
Claims8
A hybrid electric vehicle powertrain for a vehicle having a set of front traction wheels and a set of rear traction wheels comprising:
- an internal combustion engine;
- a multiple-ratio transmission with a torque input shaft drivably connected to a power output shaft for the engine and a power output shaft drivably connected to one of the sets of traction wheels;
- a first electric motor connected directly to the engine power output shaft whereby electric motor torque of the first electric motor complements engine driving torque and is adapted to provide engine starting torque;
- a second electric motor connected drivably to a second of the sets of traction wheels;
- a battery electrically coupled to the first and second electric motors;
- the second electric motor, during a ratio shift of the multiple-ratio transmission, providing wheel torque to the second set of traction wheels as driving torque from the engine to the first set of traction wheels is reduced during a ratio shift interval of the multiple-ratio transmission.
3 more elements
Dependencies are inferred from the claim text.