Misfire detection apparatus

Details Misfire detection apparatus Misfire detection apparatus

2007-08-14

2007-08-14

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

C701S103000, C123S406210, C073S035040

Reexamination Certificate

active

11284145

ABSTRACT:
Misfire of an engine is detected by extracting a pressure component of combustion from an output of a pressure sensor disposed in a cylinder. An engine misfire detection apparatus obtains a combustion parameter Cr that is a correlation between a reference signal Fc synchronous with the combustion cycle of the engine and cylinder pressure Pc obtained from an output of a pressure sensor disposed in the cylinder. The apparatus detects a misfire of the engine based on the combustion parameter. A misfire can be accurately detected even under a low load condition because the combustion parameter indicating the combustion component is extracted from the cylinder pressure as a correlation between the reference signal synchronous with the combustion cycle of the engine and the cylinder pressure obtained from the sensor output.

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patent: 5485374 (1996-01-01), Takaku et al.
patent: 5571958 (1996-11-01), Hoshina
patent: 6006157 (1999-12-01), Dai et al.
patent: 6243641 (2001-06-01), Andrews et al.
patent: 60-166739 (1985-08-01), None
patent: 64-15937 (1989-01-01), None
patent: 11-82150 (1999-03-01), None

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