Misfire detection apparatus for internal combustion engine...

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

2008-04-08

2008-04-08

Kwon, John T. (Department: 3747)

Internal-combustion engines

Spark ignition timing control

Electronic control

C123S436000, C073S035080, C701S110000

Reexamination Certificate

active

07353803

ABSTRACT:
The present invention generally includes a method of detecting a misfire in an internal combustion engine. The method includes detecting a first engine speed at a first crankshaft position that corresponds to about a top dead center compression position of a first piston within a first cylinder and detecting a second engine speed at a second crankshaft position that corresponds to about a position subsequent to the top dead center compression position. The method determines whether the misfire occurred in the first cylinder based on the first engine speed and the second engine speed. The method provides an improved signal to noise ratio for engine misfire detection.

REFERENCES:
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patent: 5869752 (1999-02-01), Klauber et al.
patent: 6222445 (2001-04-01), Beckhusen
patent: 6520159 (2003-02-01), White et al.
patent: 7133766 (2006-11-01), Kokubo
patent: 2003/0127073 (2003-07-01), Buck et al.
patent: 2003/0200789 (2003-10-01), Tanaya

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