Methods and system for stopping an engine of a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsYanan Zhao, Christopher John Teslak, Stuart N. Ford, Ralph Wayne Cunningham, Judhajit Roy, Chenliu Stephen Lu, Girish Gokul Chennupalli
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Abstract
A method and system for operating a vehicle that includes an automatic transmission with a torque converter clutch is described. In one example, the method includes predicting a time that the torque converter clutch will open so that stopping rotation of the engine may be requested before the torque converter clutch is opened. The stopping rotation of the engine is requested to conserve fuel.
Claims19
A method for operating a vehicle driveline, comprising:
- unlocking a torque converter clutch in response to a first unlock schedule during a first condition, where the first condition includes a propulsion pedal being applied;
- and
- unlocking the torque converter clutch in response to a second unlock schedule during a second condition, the second condition including a brake being applied, an integrated starter/generator having torque capacity to start an engine, and a battery having a capacity to start the engine.
A vehicle system, comprising:
- an internal combustion engine;
- an automatic transmission including a torque converter and a torque converter clutch;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to predict a transmission output shaft speed at which the torque converter clutch will be commanded to unlock after a time duration, and additional instructions to activate an electric pump of the automatic transmission in response to preparing for stopping of the internal combustion engine.
A method for operating a vehicle driveline, comprising:
- while a propulsion pedal is fully released, unlocking a torque converter clutch in response to a second unlock schedule, the unlocking performed in response to a brake being applied, an integrated starter/generator having torque capacity to start an engine, and a battery having capacity to start the engine.
Dependencies are inferred from the claim text.