Passive and active misfire diagnosis for internal combustion eng

Details Passive and active misfire diagnosis for internal combustion eng Passive and active misfire diagnosis for internal combustion eng

1998-06-01

1999-11-09

Kwon, John

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123479, F02M 700

Patent

active

059794070

ABSTRACT:
A system and method for detecting a misfire condition for a cylinder of an internal combustion engine is based upon the firing times for each cylinder and a comparison of firing times between successive cylinders in the engine firing sequence. A differential firing time parameter represents the result of this comparison and is used a passive test to determine whether a particular cylinder is misfiring. Cylinders identified in the passive test are subjected to an active test in which the cylinder is overfueled by increasing amounts for each engine cycle after commencement of the active misfire test. The change in differential firing parameter for the identified resulting from the overfueling is compared to an active test threshold value indicative of an expected change for a healthy cylinder. A cylinder falling outside this active threshold value is determined to be a bad cylinder.

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