Methods and systems for controlling a starter motor
AssigneeFord Global Technologies, LLC
InventorsDavid Hesketh, Gary Paisley
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for dealing with a change of mind event during an automatic shut-down of an engine in which the speed at which a starter motor used to restart the engine is disengaged is based upon the comparison of current engine speed (N) with a cranking speed limit (SLIM). In one example, during an engine restart while the engine is spinning down, the starter motor may crank the engine to a threshold cranking engine speed adjusted based on a position of the gear.
Claims20
A method of controlling a starter motor of a powertrain system having an engine and a driveline including a gearbox driven by the engine via a friction clutch comprising:
- when there is requirement to use the starter motor to restart the engine following a change of mind during an automated engine stop, using the starter motor to crank the engine and disengaging the starter motor when a cranking speed limit is reached wherein the cranking speed limit is based upon whether the driveline is confirmed to be fully open.
A method, comprising:
- in response to a request for restarting an engine following commencing an engine idle-stop,
- estimating a position of a gear, and
- selectively cranking the engine, via a starter motor, to a threshold cranking engine speed adjusted based on the position of the gear.
A vehicle system, comprising:
- an engine;
- a transmission system;
- and
- a controller with computer readable instructions stored on non-transitory memory to:
- in response to an engine restart request during an engine spin-down,
- during a first condition, cranking an engine via a starter motor until an engine speed increases to a first cranking speed,
- during a second condition, cranking the engine via the starter motor until the engine speed increases to a second cranking speed,
- during a third condition, cranking the engine via the starter motor until the engine speed increases to a third cranking speed, and
- during a fourth condition, cranking the engine via the starter motor until the engine speed increases to a fourth cranking speed, the fourth cranking speed higher than each of the third cranking speed, the second cranking speed, and the first cranking speed.
Dependencies are inferred from the claim text.