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US 9,791,040 B2Granted
Methods and system for operating a vehicle transmission
AssigneeFord Global Technologies, LLC
InventorsFelix Nedorezov, Alexander O'Connor Gibson, Hong Jiang, Daniel Colvin, Bernard D. Nefcy
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating a transmission of a hybrid vehicle's driveline are presented. In one example, the systems and methods adjust operation of an electrically driven transmission pump that supplies transmission fluid to one or more transmission components in response to a rotational stopping position of a mechanically drive transmission pump.
Claims19
A driveline operating method performed by an electronic controller, comprising:
- determining, with the controller, a rotational stop position of a mechanically driven transmission pump;
- and
- adjusting a speed of an electric transmission pump via the controller in response to the rotational stop position of the mechanically driven transmission pump in order to compensate for leakage of the mechanically driven transmission pump that varies with the rotational stop position to provide a desired transmission line pressure.
A driveline operating method performed by a controller, the controller performing:
- sending signals to respective actuators to:
- open a driveline disconnect clutch to couple an engine to a driveline integrated starter/generator;
- stop rotation of the driveline integrated starter/generator to stop a mechanically driven transmission pump at a rotational stop position;
- adjust a speed of an electric transmission pump in response to the rotational stop position of the mechanically driven transmission pump in order to compensate for leakage of the mechanically driven transmission pump that varies with the rotational stop position;
- command the driveline disconnect clutch closed to equalize a pressure of fluid supplied to the driveline disconnect clutch and electrically driven transmission fluid pump outlet pressure;
- and
- adjust the speed of the electric transmission pump in response to the pressure of fluid supplied to the driveline disconnect clutch to reach a desired transmission line pressure.
4 more elements
A system, comprising:
- an engine;
- a motor;
- a disconnect clutch positioned in a driveline between the engine and the motor;
- a transmission coupled to the motor, the transmission including an electrically driven pump and a mechanically driven pump;
- and
- a controller including executable instructions stored in non-transitory memory for maintaining a desired transmission line pressure by adjusting a predetermined speed of the electrically driven pump in response to a rotational stop position of the mechanically driven pump, in order to compensate for leakage of the mechanically driven pump, the rotational stop position being a position at which the mechanically driven pump stops rotating.
3 more elements
Dependencies are inferred from the claim text.