Back to results
US 11,692,501 B1Granted
Methods and systems for fuel injector balancing
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Ross Pursifull
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a fuel injector diagnostic. In one example, a method may include modifying an injection pattern to determine a relative fuel mass error of an injector. A fuel injector correction may be determined based the relative fuel mass error.
Claims20
A method, comprising:
- performing a series of injections with a plurality of fuel injectors using modified injector commands at a beginning of a diagnostic and an end of a diagnostic;
- computing an average injected mass of the series of injections of the plurality of injectors for each of the beginning and the end of the diagnostic;
- performing a series of injections with an individual injector of the plurality of fuel injectors at a middle of the diagnostic using a rail pressure change and determining an average injected mass for the individual injector;
- and
- determining a relative fuel mass error for an individual injector based on the determined average injected mass for the individual injector, the beginning average injected mass, and the end average injected mass.
2 more elements
A system, comprising:
- an engine comprising a plurality of cylinders;
- and
- a controller comprising computer-readable instructions stored on non-transitory memory thereof that enable the controller to perform a diagnostic comprising:
- performing a series of injections with a plurality of fuel injectors;
- determining a beginning average injected mass based on injections at the beginning of the diagnostic and determining an end average injected mass based on injections at the end of the diagnostic;
- performing a series of injections with a single injector of the plurality of fuel injectors;
- determining an average injected mass based on the injections of the single injector;
- determine a relative fuel mass error for the single injector based on the average injected mass of the single injector compared to a total average fuel mass injected based on the beginning average injected mass and the end average injected mass.
5 more elements
A method, comprising:
- performing a series of injections with a plurality of fuel injectors using modified injector commands at a beginning and an end of a diagnostic and computing an average injected mass of the series of injections for the plurality of injectors for each of the beginning and the end of the diagnostic;
- performing a series of injections with a single injector of the plurality of fuel injectors at a middle of the diagnostic using a rail pressure change and determining an average injected mass for the single injector;
- determining a total injected mass average based on each of the beginning average injected mass and the end average injected mass;
- determining a relative fuel mass error based on a ratio of the average injected mass for the single injector and the total injected mass average;
- and
- apply a correction to the single injector based on the determined relative fuel mass error.
3 more elements
Dependencies are inferred from the claim text.