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US 11,448,151 B1Granted
Methods and systems for improving fuel injection
AssigneeFord Global Technologies, LLC
InventorsIan D. Campbell, Joseph Lyle Thomas, Rani Kiwan, Ross Dykstra Pursifull
Life of this patent
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Abstract
Systems and methods for improving accuracy of an amount of fuel injected to an engine are disclosed. In one example, a maximum fuel injector holding current value is adjusted from a higher value to a lower value within a predetermined amount of time of an end of fuel injection. By adjusting the maximum fuel injector holding current value, it may be possible to reduce variation in an amount of fuel that is injected via the fuel injector.
Claims17
A system, comprising:
- a fuel injector;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust a maximum fuel injector holding current from a first value to a second value, and adjust a fuel injector holding current from the maximum fuel injector holding current to a minimum fuel injector holding current during a fuel injection period, and executable instructions to adjust a holding current frequency of a fuel injector responsive to engine speed being less than a threshold speed.
A method for operating a fuel injector, comprising:
- adjusting a maximum fuel injector holding current value from a first value to a second value via a controller during a first fuel injection period of the fuel injector, where the maximum fuel injector holding current value is adjusted in response to a temperature of a controller being less than a threshold.
A method for operating a fuel injector, comprising:
- adjusting a fuel injector holding current of a fuel injector at a first frequency via a controller during a fuel injection period of the fuel injector;
- and
- adjusting the fuel injector holding current of the fuel injector at a second frequency via the controller during the fuel injection period of the fuel injector, where the fuel injector holding current of the fuel injector is adjusted at the second frequency beginning a predetermined amount of time before a scheduled end of fuel injection for the fuel injector, and where the predetermined amount of time is based on a period of the first frequency.
Dependencies are inferred from the claim text.