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US 9,435,287 B2Granted
Method for fuel injection control
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Eric Krengel, Joseph Lyle Thomas, Todd Anthony Rumpsa, Michael Howard Shelby
Life of this patent
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Abstract
Methods and systems are described for controlling fuel injection in an engine equipped with a dual injector system including a port injector and a direct injector. A ratio of port injected fuel to direct injected fuel is adjusted based at least on intake valve temperature. The proportion of fuel port injected into a cylinder is increased as the intake valve temperature for the given cylinder increases to improve fuel vaporization in the intake port.
Claims7
A method for an engine, comprising:
- during a cold start, transitioning a first cylinder from a first injection profile to a second injection profile earlier relative to a second cylinder in response to an intake valve temperature of the first cylinder reaching a threshold temperature earlier than an intake valve temperature of the second cylinder, the first injection profile having a higher proportion of direct fuel injection relative to the second injection profile.
Dependencies are inferred from the claim text.