Feedback control apparatus for internal combustion engine

Details Feedback control apparatus for internal combustion engine Feedback control apparatus for internal combustion engine

1981-03-27

1982-12-21

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60289, 123440, 123489, 123589, F01N 322, F02M 724

Patent

active

043642276

ABSTRACT:
The output of an exhaust gas sensor disposed in the exhaust system of an engine is amplified by a variable gain amplifier circuit. The gain of the amplifier circuit is controlled so that the peak output voltage thereof is kept constant irrespective of changes in the output of the exhaust gas sensor due to, for example, its deterioration. The output of the exhaust gas sensor is integrated and compared with a reference value by a comparator circuit which generates a reference voltage variable with the output waveform of the exhaust gas sensor whereby a stable feedback control is realized even though the air-fuel ratio of the mixture produced from a carburetor is greatly changed.

REFERENCES:
patent: 4103649 (1978-08-01), Matumoto
patent: 4140085 (1979-02-01), Rabus
patent: 4167925 (1979-09-01), Hosaka
patent: 4226221 (1980-10-01), Asano
patent: 4266519 (1981-05-01), Norimatsu
patent: 4278060 (1981-07-01), Isobe
patent: 4294216 (1981-10-01), Abo

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