C.r.f. S.c.p.a.

Centro Richerche Fiat Societa' Sortile Per Azioni

Luigi Di Leo

Mario Palazzetti

Cesare Ponti

Calibration method for a fuel injection system

Starting from a sequence of values of indicated torque detected for each expected combustion in the engine a cycle signal is generated as a combination of at least two successive values of the said sequence. The peak value of the said cycle signal is then compared with a comparison threshold chosen preferably in proportion of the fuel injection duration into the cylinders. Misfires are identified preferably from the result of a comparison between the said peak value and the said comparison threshold which differs from the result of comparison in the presence of regular operation of the engine.

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Venaria Reale, Italy

Luigi Di Leo