METHOD OF OPERATING AN INTERNAL COMBUSTION ENGINE
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Abstract
An apparatus and method for controlling a fuel injection system of an internal combustion engine is disclosed. Each fuel injector in the system is operated to perform a predetermined injection pattern per engine cycle. A signal representative of a fuel pressure within the fuel rail during the operation of the fuel injectors is sampled. A Fourier analysis of the fuel rail pressure signal is performed to determine one or more harmonic components thereof. The determined harmonic components of the fuel rail pressure signal are used to calculate a dynamic fuel quantity that flows through a fuel injector during an injection pulse of the injection pattern. A fuel quantity actually injected by the fuel injector during the injection pulse as a function of the dynamic fuel quantity is calculated.
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Citations
34 Claims
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1-14. -14. (canceled)
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15. A method of operating an internal combustion engine having a fuel rail in fluid communication with the fuel pump and a plurality of fuel injectors in fluid communication with the fuel rail, wherein the method comprises:
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operating each fuel injector to perform a predetermined injection pattern per engine cycle; sampling a fuel rail pressure signal representative of a fuel pressure within the fuel rail during the operation of the fuel injectors; performing a Fourier analysis of the fuel rail pressure signal to determine at least one harmonic components thereof; calculating a dynamic fuel quantity that flows through a fuel injector during an injection pulse of the injection pattern using the at least one harmonic components of the fuel rail pressure signal; and determining a fuel quantity actually injected by the fuel injector during the injection pulse as a function of the dynamic fuel quantity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A fuel injection system comprising:
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a fuel pump; a fuel rail in fluid communication with the fuel pump; a plurality of fuel injectors in fluid communication with the fuel rail; and an electronic control unit configured to; operate each of the plurality of fuel injectors to perform a predetermined injection pattern per engine cycle; sample a fuel rail pressure signal representative of a fuel pressure within the fuel rail during the operation of the fuel injectors; perform a Fourier analysis of the fuel rail pressure signal to determine at least one harmonic components thereof; calculate a dynamic fuel quantity that flows through a fuel injector (160) during an injection pulse of the injection pattern using use at least one harmonic components of the fuel rail pressure signal; and calculate a fuel quantity actually injected by the fuel injector during the injection pulse as a function of the dynamic fuel quantity. - View Dependent Claims (33, 34)
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Specification