Method of controlling fuel during engine misfire

Details Method of controlling fuel during engine misfire Method of controlling fuel during engine misfire

1996-10-31

1997-12-23

Dombroske, George M.

Measuring and testing

Test stand

For engine

731173, 73119A, G01M 1500

Patent

active

057009546

ABSTRACT:
A misfire correction factor is included in the calculation of the fuel pulse width so that upon detection of a misfire, the excess fuel that would normally have entered the engine is offset or canceled, thus reducing or desensitizing the effects of the reaction of the lean biased exhaust gas oxygen sensor signal. This compensation allows for normally firing cylinders to operate closer to stoichiometric air/fuel ratio when other cylinders are operating in a misfire condition. The fuel adjustment due to engine misfire not only protects against catalyst degradation, but also decreases unwanted emissions.

REFERENCES:
patent: Re34234 (1993-04-01), Kuroiwa et al.
patent: 4445326 (1984-05-01), Lyon
patent: 4903669 (1990-02-01), Groff et al.
patent: 4979481 (1990-12-01), Shimomura et al.
patent: 5044195 (1991-09-01), James et al.
patent: 5056026 (1991-10-01), Mitchell et al.
patent: 5168859 (1992-12-01), Ohsaki
patent: 5452699 (1995-09-01), Rossignol

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