Internal combustion engine misfire detector

Details Internal combustion engine misfire detector Internal combustion engine misfire detector

1991-12-18

1993-07-13

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

052263223

ABSTRACT:
A method of detecting a misfire condition in a spark ignited internal combustion engine where the idle speed of the engine is controlled by an idle speed control means which controls engine idle speed by varying the spark timing advance for the engine ignition system. With the engine running at idle speed, the instantaneous spark timing advance being developed is repeatedly sampled for a predetermined number of consecutively occurring data samples. The absolute difference in sampled spark timing advance values between each pair of data samples is calculated for all of the predetermined number of data samples. The absolute differences in spark timing values that occur between data samples are added together to provide a sum total. If the sum total exceeds a reference value, the engine is operating in a misfire condition.

REFERENCES:
patent: 4189171 (1980-02-01), Morita
patent: 4268910 (1981-05-01), Omori et al.
patent: 4420967 (1983-12-01), Enushima et al.
patent: 4691286 (1987-09-01), Obayashi et al.

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