Method and system to manage driveline oscillations with clutch pressure control
AssigneeFord Global Technologies, LLC
InventorsBernard D. Nefcy, Marvin Paul Kraska, Daniel Scott Colvin, Seung-Hoon Lee
Life of this patent
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Abstract
A system and method for controlling a vehicle having an electric traction motor coupled to a transmission by a clutch include modifying torque transmitted to the driveline by modifying the clutch apply pressure in response to a difference between rotational speed of a driveline component and a filtered rotational speed of the driveline component to reduce driveline oscillation when the clutch is unlocked. The clutch pressure may be modified in response to a vehicle event that may otherwise induce driveline oscillations, such as a transmission ratio change or regenerative braking, for example.
Claims23
A method for controlling a vehicle having a traction motor selectively coupled by a clutch to a driveline, comprising:
- modifying clutch pressure of the clutch in response to a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component to reduce driveline oscillations.
A system for controlling a powertrain of a vehicle, comprising:
- a traction motor selectively coupled to a vehicle driveline by a clutch;
- and
- a controller in communication with the clutch and configured to unlock the clutch and modify clutch pressure to control torque transmitted to the driveline in response to a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component.
A hybrid electric vehicle, comprising:
- an engine;
- a traction motor selectively coupled to the engine by a first clutch;
- an automatic transmission selectively coupled to the traction motor by a second clutch;
- and
- a controller programmed to modify clutch pressure of the second clutch when the second clutch is unlocked in response to a difference between a rotational speed and a filtered rotational speed of the driveline component.
Dependencies are inferred from the claim text.