System and method for adjusting on-time calibration of a fuel injector in internal combustion engine
AssigneeCummins Inc.
InventorsMichael J. Ruth, Michael J. Cunningham
Life of this patent
Estimating the term…
Abstract
The disclosure provides a system and method for determining an amount of fuel injected or delivered by a single fuel injector in an internal combustion engine by generating one fuel injection event after the engine has stopped operating. The fuel delivered is statistically analyzed in comparison with a commanded fuel delivery amounts to determine the suitability of fuel injector on-time calibration for the analyzed fuel injector. If the fuel delivered deviates from the commanded amount of fuel delivery by a predetermined value, the fuel injector on-time calibration for the analyzed fuel injector is changed.
Claims24
A method of calibrating fuel injectors of an engine, comprising:
- providing a control system including an engine shutdown sensor, an accumulator pressure sensor, and at least one processor having a non-transitory computer-readable medium configured to receive a plurality of instructions;
- receiving, by the processor, an engine shutdown value indicating that the engine is shut down from the engine shutdown sensor;
- providing a fuel injection value, from the processor to at least one of the fuel injectors, to initiate a single fuel injection event for the one of the fuel injectors corresponding to a cylinder in response to the engine shutdown value when the engine is shut down;
- receiving, by the processor, a pressure value, from the accumulator pressure sensor, representing a fuel pressure over a period of time, which includes the fuel injection event;
- calculating, by the processor, an amount of fuel actually injected in response to the pressure value;
- producing, by the processor, a deviation value in response to the amount of fuel and a commanded amount of fuel;
- and
- determining, by the processor, a correction factor for the injector in response to the deviation value.
A control system, comprising:
- a memory configured to store a commanded amount of fuel for a fuel injector corresponding to a cylinder;
- and
- an analysis module coupled to the memory and configured to:
- detect an engine shutdown value indicating that the engine is shut down;
- determine a deviation value in response to the commanded amount of fuel and an amount of fuel delivered during an injection event initiated in response to the engine shutdown value when the engine is shut down;
- determine a correction factor in response to the deviation value;
- and
- operate the fuel injector in response to the correction factor.
An engine system, comprising:
- an engine including an engine block having a set of cylinders;
- a fuel injection system including a fuel pump, a fuel accumulator, and a set of fuel injectors in fluid communication with the fuel accumulator, each fuel injector configured to inject fuel into a corresponding cylinder;
- and
- means for adjusting an on-time value of a fuel injector in response to a deviation between an amount of fuel and a commanded amount of fuel, wherein the means for adjusting the on-time value of the fuel injector is configured to detect an engine shutdown value indicating that the engine is shut down and error in the amount of fuel caused by an operating fuel pump is mitigated during the engine shutdown.
A method of calibrating fuel injectors of an engine, comprising:
- receiving an engine shutdown value indicating that the engine is shut down;
- providing a fuel injection value to initiate a single fuel injection event for a fuel injector corresponding to a cylinder in response to the engine shutdown value when the engine is shut down;
- receiving a pressure value representing a fuel pressure over a period of time, which includes the fuel injection event;
- calculating an amount of fuel actually injected in response to the pressure value;
- producing a deviation value in response to the amount of fuel and a commanded amount of fuel;
- determining a correction factor for the injector in response to the deviation value;
- and
- operating the fuel injector in response to the correction factor.
Dependencies are inferred from the claim text.