Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1981-03-05
1983-03-08
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, F02D 3500
Patent
active
043757960
ABSTRACT:
An air-fuel ratio control system for an internal combustion engine which comprises an intake passage, an exhaust passage, an air-fuel mixture supply device, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the air-fuel mixture supply device, a dither signal generating circuit for producing a periodical dither signal, a shift control circuit for shifting the level of the center of the dither signal, a driving circuit for producing a driving output for the on-off type electromagnetic valve, and an O.sub.2 sensor for detecting the concentration of oxygen in exhaust gases passing through the exhaust passage. A first circuit is provided for detecting a middle value between the maximum value and minimum value of the output voltage of the O.sub.2 sensor in each cycle, and a second circuit is provided for detecting a middle value with respect to the output waveform of the O.sub.2 sensor such that the areas thereof above and below the latter middle value are equal. A shift signal generating circuit is provided for comparing the outputs of the first and second circuits for generating the difference as a shift signal. The shift control circuit is so arranged to control the air-fuel ratio of the mixture in such a direction that the difference is decreased.
REFERENCES:
patent: 4108121 (1978-08-01), Minami et al.
patent: 4214558 (1980-07-01), Nishioka et al.
Matsui Fujio
Ohgami Masaaki
Argenbright Tony M.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nissan Motor Co,. Ltd.
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