Misfire detection apparatus for internal combustion engine

Details Misfire detection apparatus for internal combustion engine Misfire detection apparatus for internal combustion engine

2005-02-01

2005-02-01

Kwok, Helen (Department: 2856)

Measuring and testing

Engine detonation

Specific type of detonation sensor

C073S117020

Reexamination Certificate

active

06848296

ABSTRACT:
A misfire detection apparatus for an internal combustion engine is capable of detecting combustion when an ionic current generated upon combustion is superimposed on a leakage current, even if the ionic current does not contain an increased component. An ionic current detection part (1) detects an ionic current flowing between electrodes arranged in a combustion chamber of the internal combustion engine through ions generated upon combustion of an air fuel mixture therein by impressing a voltage on the electrodes. A tendency recognition part (4-7) recognizes a tendency of a change in the ionic current detected by the ionic current detection part. A threshold determination device (8) sets a threshold for an output of the tendency recognition part. A determination device (10) determines an occurrence of combustion or misfiring in the combustion chamber based on an output of the tendency recognition part and an output of the threshold determination device.

REFERENCES:
patent: 5836285 (1998-11-01), Aoki et al.
patent: 6378494 (2002-04-01), Hatazawa et al.
patent: 20030200023 (2003-10-01), Matsushita et al.
patent: 20030217587 (2003-11-01), Inada et al.
patent: 2001-90647 (2001-04-01), None

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