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US 9,499,170 B2Granted
Method and system for operating a vehicle powertrain
AssigneeFord Global Technologies, LLC
InventorRalph Wayne Cunningham
Life of this patent
Estimating the term…
Abstract
A system and method for operating a vehicle powertrain are described. In one example, a torque converter that has a variable K factor is adjusted to improve vehicle operation. The system and method may improve vehicle launch and vehicle operation at lower vehicle speeds.
Claims11
A method for operating a vehicle powertrain, comprising:
- adjusting a K factor of a torque converter in response to a difference between a desired vehicle creep speed and an actual vehicle creep speed and absent a driver input demand torque while a transmission is operated in first gear;
- and
- increasing engine speed and engine air flow in response to an engine temperature less than a threshold temperature.
A method for operating a vehicle powertrain, comprising:
- adjusting a K factor of a torque converter in response to a difference between a desired boost pressure and an actual boost pressure, where the K factor is adjusted via adjusting an axial position of a turbine relative to an impeller.
Dependencies are inferred from the claim text.