Method and system for determining combustion misfire of an...

Details Method and system for determining combustion misfire of an... Method and system for determining combustion misfire of an...

2007-01-02

2007-01-02

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

11158404

ABSTRACT:
A method and system for determining a combustion misfire in an internal combustion engine by calculating a segment time; normalizing the calculated segment time; modifying the normalized segment time using low pass filters for each cylinder; calculating a misfire determination reference value by adding a minimum value among the modified normalized segment times to a predetermined offset value; and determining whether a combustion misfire occurs based on a comparison of the modified normalized segment time and the misfire determination reference value.

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patent: 5955663 (1999-09-01), Ries-Muller et al.
patent: 6112149 (2000-08-01), Varady et al.
patent: 6415656 (2002-07-01), Bidner et al.
patent: 6922628 (2005-07-01), Zhu et al.
patent: 2005/0114012 (2005-05-01), Zhu et al.

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