Method and system for improving hybrid vehicle shifting
First Claim
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1. A hybrid powertrain system, comprising:
- a drivetrain including an engine;
a transmission including a torque converter; and
a controller including executable instructions stored in non-transitory memory for operating the 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, where the first inertia does not include an inertia of the engine, and where the torque converter impeller torque is based on an offset that is related to driveline spin losses.
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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.
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Citations
12 Claims
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1. A hybrid powertrain system, comprising:
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a drivetrain including an engine; a transmission including a torque converter; and a controller including executable instructions stored in non-transitory memory for operating the 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, where the first inertia does not include an inertia of the engine, and where the torque converter impeller torque is based on an offset that is related to driveline spin losses. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hybrid powertrain system, comprising:
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a drivetrain including an engine and a transmission; and a controller including executable instructions stored in non-transitory memory for operating the 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 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, where 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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification