Method and system to manage driveline oscillations with clutch pressure control
First Claim
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1. 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.
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Accused Products
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.
18 Citations
23 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for controlling a powertrain of a vehicle, comprising:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A hybrid electric vehicle, comprising:
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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. - View Dependent Claims (21, 22, 23)
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Specification