Methods and system for controlling driveline torque
First Claim
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1. A powertrain operating method, comprising:
- providing a negative input torque to a transmission via a motor in response to the motor being available to supply the negative input torque and driver demand torque less than a threshold;
providing the negative input torque to the transmission via an engine operating in a deceleration fuel cut off mode in response to the motor being unavailable to supply the negative input torque and the driver demand torque less than the threshold; and
opening a torque converter clutch in response to a request to enter a gear having a ratio greater than a threshold and the motor being unavailable to supply the negative input torque.
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Abstract
Systems and methods for operating a hybrid powertrain that includes an engine and a motor/generator are described. The systems and methods adjust torque converter clutch opening responsive to whether or not a motor/generator is available to provide a negative torque to a driveline. Further, the motor/generator and the vehicle'"'"'s engine are operated to provide a desired amount of driveline braking.
13 Citations
9 Claims
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1. A powertrain operating method, comprising:
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providing a negative input torque to a transmission via a motor in response to the motor being available to supply the negative input torque and driver demand torque less than a threshold; providing the negative input torque to the transmission via an engine operating in a deceleration fuel cut off mode in response to the motor being unavailable to supply the negative input torque and the driver demand torque less than the threshold; and opening a torque converter clutch in response to a request to enter a gear having a ratio greater than a threshold and the motor being unavailable to supply the negative input torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification