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US 2017/0361831 A1Published application
Methods and system for controlling driveline torque
AssigneeFord Global Technologies, LLC
InventorsRajit Johri, Fazal Urrahman Syed, Ming Lang Kuang
Life of this patent
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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.
Claims20
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;
- and
- 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.
A powertrain operating method, comprising:
- opening a torque converter clutch according to a first schedule in response to the motor being available to supply the negative powertrain torque and driver demand torque being less than a threshold;
- and
- opening the torque converter clutch according to a second schedule in response to the motor being unavailable to supply the negative powertrain torque and the driver demand torque being less than the threshold.
A system, comprising:
- an engine;
- a motor/generator;
- a motor/generator controller in electrical communication with the motor/generator;
- a disconnect clutch positioned in a powertrain between the engine and the motor;
- a transmission including a torque converter lockup clutch, the transmission coupled to the motor/generator;
- and
- a vehicle system controller including executable instructions stored in non-transitory memory to unlock the torque converter clutch based on a first schedule in response to the motor/generator being available to supply negative powertrain torque and release of an accelerator pedal, and additional executable instructions to unlock the torque converter clutch based on a second schedule in response to the motor/generator being unavailable to supply negative powertrain torque and release of an accelerator pedal.
4 more elements
Dependencies are inferred from the claim text.