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US 2017/0320484 A1Published application
Methods and system for mitigating undesirable conditions during regenerative braking
AssigneeFord Global Technologies, LLC
InventorsBernard D. Nefcy, Mark Steven Yamazaki, Jason Meyer, Mark Davison
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Abstract
Systems and methods for operating a transmission of a hybrid powertrain that includes a motor/generator are described. The systems and methods may classify transmission degradation in response to an estimated transmission input shaft speed that is determined from transmission output shaft speed. In one example, transmission degradation may be correctable transmission degradation, partial transmission degradation, and continuous transmission degradation.
Claims13
A powertrain operating method, comprising:
- predicting a transmission input shaft speed from a transmission output shaft speed;
- adjusting a regeneration torque of an electric machine coupled to a transmission in response to an actual transmission input shaft speed minus the predicted transmission input shaft speed and a type of transmission degradation.
7-14. (canceled)
A system, comprising:
- an engine;
- a motor/generator;
- a disconnect clutch positioned in a powertrain between the engine and the motor/generator;
- a transmission coupled to the motor/generator;
- and
- a controller including executable instructions stored in non-transitory memory for deactivating one or more transmission gears selectively activated via a clutch in response to an actual transmission input shaft speed minus a predicted transmission input shaft speed being less than a threshold value.
3 more elements
Dependencies are inferred from the claim text.