| 摘要 |
A method is provided for correcting the cylinder unbalancing in an internal combustion engine. The method includes, but is not limited to the steps of acquiring the crankshaft or engine speed signal while a fuel injector is energized for a determined period of time in which all other fuel injectors are de-energized, generating a square wave signal by scanning said markings with the detector, the signal having a predetermined period, performing a first period-summing step so as to obtain first segments of the periods, performing a digital anti-aliasing filtering of the first segments, performing a segment-summing step so as to obtain second, larger segments, performing a band-pass filtering step on predetermined harmonic components thus obtaining intermediate values, creating filtered correction values representative of an ideal crankshaft wheel speed signal, correcting the intermediate values using the filtered correction values thus obtaining final values, performing a proportional and integral control, component by component, based on the final values, summing (34) all the harmonic components values thus obtaining a fuel quantity correction value; and correcting the cylinder unbalancing by controlling the fuel injectors according to the fuel quantity correction value.
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