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US 11,313,310 B1Granted
Methods and systems for improving fuel injection repeatability
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Ross Pursifull, Joseph Lyle Thomas
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for balancing a plurality of fuel injectors. In one example, a method includes determining a fuel injector error shape and applying a fueling correction to all injectors based on the fuel injector error shape.
Claims16
A method, comprising:
- adjusting a fuel injection parameter in response to a fuel rail pressure drop of a group of injectors at a first pulse-width, wherein the fuel rail pressure drop is determined via firing an integer multiple of the group of injectors, wherein the integer multiple is greater than two, and wherein the firing the integer multiple is preceded and followed by a skip injection pattern, wherein the skip injection pattern includes where the group of injectors are skipped and do not inject fuel.
A system, comprising:
- an engine;
- a first cylinder bank and a second cylinder bank comprising a plurality of cylinders, wherein each cylinder of the plurality of cylinders includes a direct injector configured to inject fuel directly therein and a port-fuel injector configured to inject fuel into an intake port thereof;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed cause the controller to:
- execute a pressure-based injector balancing diagnostic in response to conditions;
- learn a first drop of a fuel rail pressure for a multiple integer number of injections of both the first cylinder bank and the second cylinder bank at a first pulse-width (PW);
- and
- adjust fueling parameters of the injections in response to a slope determined between the first drop of the first PW and a second drop of a second PW.
5 more elements
A method for an engine comprising a controller with instructions stored on memory that cause the controller to execute the method, the method, comprising:
- determining a shape of an injector transfer function based on one or more of a drop in fuel rail pressure (FRP) for a single injector at a plurality of pulse-widths (PWs) greater than or equal to a threshold PW and a drop in FRP for a group of injectors at the plurality of PWs, wherein the drop in FRP for the single injectors at the plurality of PWs further includes skipping injections from other injectors of an engine, wherein skipping injections includes deactivating the other injectors and not injecting fuel therefrom;
- and
- adjusting PWs provided to the group of injectors based on the shape of the injector transfer function.
Dependencies are inferred from the claim text.