Engine misfire detection system

Details Engine misfire detection system Engine misfire detection system

2006-04-18

2006-04-18

Wolfe, Willis R. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C701S109000, C701S101000, C123S673000

Reexamination Certificate

active

07031828

ABSTRACT:
An engine misfire detection system includes a database of engine fingerprints, each fingerprint corresponding to a known misfire condition. A technician uses software to compare the fingerprints in the database to an engine with a combustion inefficiency to determine which cylinder in the engine has the combustion inefficiency. The fingerprints are generated by evaluating an output from a lambda sensor and a timing reference. An alternate embodiment associates oxygen sensors with each of the cylinders in the engine and infers combustion inefficiency when a given sensor detects a peak in the amount of oxygen.

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