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US 9,031,722 B2Granted
Method and system for improving hybrid vehicle shifting
AssigneeFord Global Technologies, LLC
InventorsJeffrey Allen Doering, Dennis Craig Reed, Alex O'Connor Gibson, Gregory Michael Pietron, James William Loch McCallum
Life of this patent
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Abstract
A method and a system for improving operation of a hybrid vehicle are presented. In one example, torque converter impeller torque from beginning to end of transmission shifting is adjusted in response to variable driveline inertia. The approach may improve transmission shifting and reduce driveline torque disturbances.
Claims10
A method for operating a hybrid powertrain, comprising:
- operating a drivetrain with a first inertia and adjusting a torque converter impeller torque during transmission gear shifting in response to the first inertia;
- and
- operating the drivetrain with a second inertia and adjusting the torque converter impeller torque during transmission gear shifting in response to the second inertia;
- wherein the first inertia includes an inertia of a driveline integrated starter/generator (DISG) and inertia of a portion of a driveline disconnect clutch, further comprising capturing a difference between a desired transmission torque when the driveline disconnect clutch is closed and a desired transmission torque when the driveline disconnect clutch is open and adjusting a torque source output based on the difference;
- and
- wherein the first inertia does not include inertia of an engine and wherein the torque converter impeller torque is based on a final drive ratio and an offset that is related to driveline spin losses.
3 more elements
A method for operating a hybrid powertrain, comprising:
- operating a drivetrain with a first inertia and adjusting a first torque converter impeller torque during transmission gear shifting in response to the first inertia;
- capturing the first torque converter impeller torque in a controller memory in response to a request to close a driveline disconnect clutch;
- transitioning from the first torque converter impeller torque to a second torque converter impeller torque;
- and
- operating the drivetrain with a second inertia and adjusting the second torque converter impeller torque during transmission gear shifting in response to the second inertia after the request to close the driveline disconnect clutch;
- wherein the first torque converter impeller torque is based on the first inertia, further comprising capturing a difference between a desired transmission torque when the driveline disconnect clutch is closed and a desired transmission torque when the driveline disconnect clutch is open, and adjusting a torque source based on the difference;
- and
- wherein the second torque converter impeller torque is based on the second inertia, and where the second torque converter impeller torque is further based on a final drive ratio and an offset that is related to driveline spin losses.
5 more elements
Dependencies are inferred from the claim text.