METHOD FOR EVALUATING THE QUANTITY OF FUEL INJECTED BY A FUEL INJECTOR IN AN INTERNAL COMBUSTION ENGINE, PARTICULARLY A DIESEL COMMON-RAIL ENGINE
First Claim
1. A method for evaluating the quantity of a fuel with of an electrically controlled fuel injector that is actually injected into a corresponding cylinder of an internal combustion engine, that includes a crankshaft with associated an detector adapted to provide a signal representative of a speed of the crankshaft, the method comprising the steps of:
- acquiring a signal while the electrically controlled fuel injector is energized for a predetermined period in which substantially all other fuel injectors are de-energized;
processing the signal so as to data representative of an amplitude of a harmonic component of the signal;
calculating a power value of the harmonic component; and
assuming the power value of the harmonic component as an estimation of the quantity of the fuel actually injected by the electrically controlled fuel injector in the predetermined period.
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Accused Products
Abstract
A method is provided that includes, but is not limited to acquiring the crankshaft speed signal while one fuel injector is energized for a determined period of time (ET) in which all the other fuel injectors are de-energized, processing the acquired crankshaft speed signal so as to obtain signals or data (A) representative of the amplitude of a predetermined harmonic component of the crankshaft speed signal, and calculating the power (RMS/MS) of said harmonic component, and assuming the calculated power value (C) as an estimation of the quantity of fuel actually injected by the energized injector in said predetermined period of time (ET).
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Citations
16 Claims
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1. A method for evaluating the quantity of a fuel with of an electrically controlled fuel injector that is actually injected into a corresponding cylinder of an internal combustion engine, that includes a crankshaft with associated an detector adapted to provide a signal representative of a speed of the crankshaft, the method comprising the steps of:
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acquiring a signal while the electrically controlled fuel injector is energized for a predetermined period in which substantially all other fuel injectors are de-energized; processing the signal so as to data representative of an amplitude of a harmonic component of the signal; calculating a power value of the harmonic component; and assuming the power value of the harmonic component as an estimation of the quantity of the fuel actually injected by the electrically controlled fuel injector in the predetermined period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a quantity of fuel injected by each fuel injector into a corresponding cylinder of an internal combustion engine, comprising the steps of:
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acquiring a signal while a fuel injector is energized for a predetermined period in which substantially all other fuel injectors are de-energized; processing the signal so as to data representative of an amplitude of a harmonic component of the signal; calculating a power value of the harmonic component; assuming the power value of the harmonic component as an estimation of the quantity of fuel actually injected by the fuel injector in the predetermined period; and controlling an energizing time (ET) of the injectors based at least in part on estimations of the quantity of fuel actually injected by each injector. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification