Method and system to manage driveline oscillations with motor torque adjustment
First Claim
1. A computerized method for controlling a vehicle having a traction motor selectively coupled to an engine via a first coupling member and to a transmission via a second coupling member, the method comprising:
- via a controller, modifying traction motor torque while the second coupling member is engaged based on a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component to reduce driveline oscillations; and
via the controller, modifying pressure in the second coupling member while the second coupling member is at least partially disengaged based on the difference, wherein the driveline component is a transmission component when the second coupling member is at least partially disengaged.
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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 traction motor torque in response to the difference between rotational speed of a driveline component and the filtered rotational speed of the driveline component to reduce driveline oscillation when the clutch is locked. The traction motor torque 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.
26 Citations
16 Claims
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1. A computerized method for controlling a vehicle having a traction motor selectively coupled to an engine via a first coupling member and to a transmission via a second coupling member, the method comprising:
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via a controller, modifying traction motor torque while the second coupling member is engaged based on a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component to reduce driveline oscillations; and via the controller, modifying pressure in the second coupling member while the second coupling member is at least partially disengaged based on the difference, wherein the driveline component is a transmission component when the second coupling member is at least partially disengaged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for controlling a powertrain of a vehicle, comprising:
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a traction motor selectively coupled to an engine by a first coupling member and to a transmission by a second coupling member; and a controller programmed to, while the second coupling member is engaged, modify traction motor torque based on a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component to reduce driveline oscillations, and while the second coupling member is slipping, modify pressure in the second coupling member based on the difference to reduce driveline oscillations, wherein the driveline component is a transmission component when the second coupling member is slipping. - View Dependent Claims (9, 10, 11, 12)
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13. A hybrid electric vehicle, comprising:
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an engine; a traction motor selectively coupled to the engine by a first clutch, and selectively coupled to a transmission by a second clutch; and a controller programmed to, based on a difference between a rotational speed of a driveline component and a filtered rotational speed of the driveline component, modify motor torque when second clutch is locked and modify second clutch pressure when the second clutch is slipping. - View Dependent Claims (14, 15, 16)
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Specification