Method and systems for engine fuel injection control
AssigneeGeneral Electric Company
InventorsPaul Gerard Nistler, Luke Henry, Jeffrey David Willis
Life of this patent
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Abstract
Various methods and systems are provided for indexing an injector map and subsequently controlling fuel injection to an engine. In one embodiment, a non-transitory computer readable storage medium with memory comprises fuel injector activation data indexed in the memory according to an input parameter, instructions for determining a modified pressure value based on a determined pressure and a modified pressure function, and instructions for generating a fuel injector activation output by interpolating among the indexed fuel injector activation data with the modified pressure value as the input parameter.
Claims20
A non-transitory computer readable storage medium with memory, comprising:
- fuel injector activation data indexed in the memory according to two input parameters, where a first of the two input parameters is a function of a fuel rail pressure, and where the function is a modified pressure function that transforms the indexed fuel injector activation data so a relationship between a second of the two input parameters and the first input parameter is more linear;
- instructions for determining a modified pressure value based on a determined pressure and the modified pressure function;
- and
- instructions for generating a fuel injector activation output by interpolating among the indexed fuel injector activation data with the modified pressure value as the first input parameter.
A method for controlling a system having an engine, the method comprising:
- indexing fuel injector activation data in a computer memory as a function of a modified pressure function, where the indexed fuel injector activation data is stored in the computer memory in an injector map, where the modified pressure function is a function of fuel rail pressure and transforms the stored fuel injector activation data to be more linear between data points of the injector map, and where each fuel injector activation data point of the fuel injector activation data corresponds to a modified pressure and a fuel value in the injector map;
- linearly interpolating among the indexed injector activation data of the injector map to determine an injector activation time at a determined fuel rail pressure based on the modified pressure function;
- and
- adjusting fuel injection of the engine based on the injector activation time.
A fuel rail system, comprising:
- a common fuel rail;
- a plurality of fuel injectors operable to inject fuel from the common fuel rail to cylinders of an engine;
- a non-transitory computer readable storage medium with memory, wherein one injector table is stored within the memory, and wherein the one injector table comprises injector data indexed according to a modified pressure function that creates a more linear relationship between the injector data within the one injector table;
- and
- a controller operable to control the fuel injectors based on a fuel injector activation time, wherein the controller is configured to determine the fuel injector activation time by interpolating the indexed injector data within the one injector table based on a determined fuel rail pressure and a quantity of fuel injected by a single fuel injector stroke.
Dependencies are inferred from the claim text.