System for feedback-controlling the air-fuel ratio of an air-fue

Details System for feedback-controlling the air-fuel ratio of an air-fue System for feedback-controlling the air-fuel ratio of an air-fue

1990-01-25

1991-10-15

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123443, F01N 320

Patent

active

050563084

ABSTRACT:
A feedback control system for an air-fuel ratio according to the present invention comprises a first oxygen sensor for detecting the oxygen concentration of exhaust gas flowing through a first exhaust pipe of an internal combustion engine, a second oxygen sensor for detecting the oxygen concentration of the exhaust gas passed through an exhaust gas disposer in a common exhaust passage which is connected with both first and second exhaust pipes of the engine, and an electronic control unit for calculating the amount of fuel supply to each cylinder of the engine in accordance with the oxygen concentration of the exhaust gas detected by means of the first oxygen sensor. The electronic control unit contains therein a correction circuit for correcting the amount of fuel supply to that cylinder of the engine which is associated with the second exhaust pipe, in accordance with the oxygen concentration of the exhaust gas detected by means of the second oxygen sensor.

REFERENCES:
patent: 4227496 (1980-10-01), Martel
patent: 4409949 (1983-10-01), Tanaka
patent: 4467602 (1984-08-01), Iizuka
patent: 4793135 (1988-12-01), Obstfelder
patent: 4817384 (1989-04-01), Okumura
patent: 4912926 (1990-04-01), Kumagai et al.

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