Methods and systems for stopping an engine
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, David Oshinsky, Richard John Hippley, Danny Zdravkovski, Craig Cabadas
Life of this patent
Estimating the term…
Abstract
Systems and methods for improving operation of a stop/start vehicle are presented. In one example, an engine throttle position is adjusted in response to whether or not a starter engages a flywheel during engine stopping. The throttle may be adjusted to a more open position if the starter engages the flywheel or to a more closed position if the starter does not engage the flywheel.
Claims18
A method for stopping rotation of an engine of a vehicle, comprising:
- ceasing fuel delivery to engine cylinders combusting air and fuel via a controller;
- commanding engagement of a starter pinion from a state not engaged with a flywheel of the engine to a state engaged with the flywheel of the engine, where the commanding engagement of the starter pinion is based on a first condition of engine speed being less than a first vibration speed threshold and engine speed being greater than a second vibration speed threshold;
- and
- adjusting a position of a throttle based on whether or not the starter pinion engages the flywheel of the engine via the controller in response to commanding engagement of the starter pinion and engine speed reaching zero.
A method for stopping rotation of an engine of a vehicle, comprising:
- ceasing fuel delivery to engine cylinders combusting air and fuel via a controller;
- commanding engagement of a starter pinion that is not engaged to a flywheel of the engine to engage the flywheel of the engine via the controller, where the commanding engagement of the starter pinion is based on a first condition of engine speed being less than a first vibration speed threshold, engine speed being less than a second vibration speed threshold, and engine speed being greater than an engagement speed;
- adjusting a position of a throttle to a first position when the starter pinion engages the flywheel of the engine via the controller;
- adjusting the position of the throttle to a second position when the starter pinion does not engage the flywheel of the engine via the controller, the second position less open than the first position;
- cranking the engine via a starter with the throttle in the first position before engine stopping in response to an operator change of mind via the controller and stopping the engine speed to zero in response to an absence of the operator change of mind via the controller.
A vehicle system, comprising:
- an engine including a throttle;
- a dual mass flywheel (DMF) including a first side mechanically coupled to the engine;
- a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel;
- a starter including a base state where the starter is not engaged to the engine;
- a transmission selectively coupled to the engine via the driveline disconnect clutch;
- and
- a controller including executable instructions stored in non-transitory memory to adjust a position of the throttle during an engine stop based on engine speed being less than a first vibration speed threshold, engine speed being less than a second vibration speed threshold, engine speed being greater than a starter pinion engagement speed, and engine speed being zero.
Dependencies are inferred from the claim text.