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US 9,656,663 B2Granted
Methods and system for operating a powertrain during regenerative braking
AssigneeFord Global Technologies, LLC
InventorsBernard D. Nefcy, Mark Steven Yamazaki, Jason Meyer, Mark Davison
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating a transmission of a hybrid powertrain that includes a motor/generator are described. The systems and methods may adjust one or more actuators in response to an estimated transmission input shaft speed that is determined from transmission output shaft speed. The one or more actuators may include a transmission clutch, the motor/generator, or a gear selection solenoid.
Claims18
A powertrain operating method, comprising:
- predicting a transmission input shaft speed from a transmission output shaft speed;
- adjusting an actuator in response to an actual transmission input shaft speed minus the predicted transmission input shaft speed;
- and
- determining a negative powertrain wheel torque limit based on the actual transmission input shaft speed minus the predicted transmission input shaft speed.
1 more element
A powertrain operating method, comprising:
- in response to an actual transmission input shaft speed decreasing to less than a threshold value, decreasing a negative wheel torque magnitude limit toward a value of zero;
- and
- adjusting a torque of a motor/generator to provide negative wheel torque less than the negative wheel torque limit.
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 adjusting a clutch pressure in response to an actual transmission input shaft speed minus a predicted transmission input shaft speed, and further comprising additional instructions to decrease a negative torque of the motor/generator toward zero torque in response to the actual transmission input shaft speed minus the predicted transmission input shaft speed.
3 more elements
Dependencies are inferred from the claim text.