System for identifying misfire cylinder in internal combustion e

Details System for identifying misfire cylinder in internal combustion e System for identifying misfire cylinder in internal combustion e

1990-10-24

1991-10-22

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123479, 123435, F02P 514

Patent

active

050585517

ABSTRACT:
A system for identifying a misfired cylinder of a multiple cylinder internal combustion engine is provided. The system comprises a sensor which monitors revolutional cycles of cylinders respectively to determine a parameter associated with a variation in an average effective pressure of the cylinder in a preselected relation to the revolutional cycles. When the parameter is less than a preselected level, the system corrects the parameter by a correction factor to provide a second parameter in order to prevent reduction in the average effective pressure due to wavering of engine speed after misfire occurs from causing erroneously detection of the misfire cylinder. The system then compares the second parameter with a slice level to detect occurrence of misfire and identifies the misfired cylinder.

REFERENCES:
patent: 4928228 (1990-05-01), Fujimoto et al.
patent: 4930481 (1990-06-01), Fujimoto et al.
patent: 4945879 (1990-08-01), Fujimoto et al.
patent: 4971010 (1990-11-01), Iwata

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