Device for diagnosing misfiring of a multi cylinder engine

Details Device for diagnosing misfiring of a multi cylinder engine Device for diagnosing misfiring of a multi cylinder engine

1996-07-11

1998-03-31

Dombroske, George M.

Measuring and testing

Vehicle chassis

Steering

73116, 123419, 123436, 36443107, 36443108, G01M 1500

Patent

active

057341001

ABSTRACT:
A mechanism is provided for outputting reference signals in synchronism with the firing action of the cylinders of a multi cylinder engine. Correction coefficients are calculated for correcting deviations in the periods between the cylinders from the periods of the reference signals which are obtained during the fuel cut off state. The periods of the reference signals for each cylinder are corrected according to these correction coefficients, and the presence or absence of misfiring for each cylinder is determined from the corrected periods. On the one hand the determination of misfiring is prevented when input of external interference to the engine is present, and on the other hand the learning of the correction coefficients is prevented when instability has occurred in the reference signals during the fuel cut off state. Since the learning of the correction coefficients is prevented in different circumstances from those in which the determination of misfiring is prevented, the learning accuracy for the correction coefficients is elevated.

REFERENCES:
patent: 5041979 (1991-08-01), Hirka et al.
patent: 5117681 (1992-06-01), Dosdall et al.
patent: 5197325 (1993-03-01), Tamura et al.
patent: 5426587 (1995-06-01), Imai et al.
patent: 5452604 (1995-09-01), Namiki et al.
patent: 5567873 (1996-10-01), Toyoda

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