Air-fuel ratio control device of an internal combustion engine

Details Air-fuel ratio control device of an internal combustion engine Air-fuel ratio control device of an internal combustion engine

1990-06-21

1991-12-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, F01N 322

Patent

active

050741136

ABSTRACT:
An air-fuel ratio control device comprising two main air-fuel ratio detecting sensors arranged in first and second exhaust passages upstream of three-way catalysts respectively for detecting an air-fuel ratio in the first and second exhaust passages, an auxiliary air-fuel ratio detecting sensor for detecting an air-fuel ratio in at least a first exhaust passage of the first and second exhaust passages downstream of the three-way catalysts, a deviation detecting unit for detecting a mutual deviation between the air-fuel ratios in the first and second exhaust passages, a first control value controlling unit for controlling a control value in at least the first cylinder bank to which the first exhaust passage is connected, on the basis of the value detected by the auxiliary air-fuel ratio detecting sensor, a second control value controlling unit for controlling a control value in at least the second cylinder bank on the basis of the deviation detected by the deviation detecting unit to cancel the deviation, a feedback correction coefficient controlling unit for controlling the feedback correction coefficients in the cylinder banks on the basis of the values detected by the corresponding main air-fuel ratio detecting sensors and the control values, and an air-fuel ratio control unit for controlling the air-fuel ratio in the first and second exhaust passages by the corresponding feedback correction coefficients to obtain a predetermined air-fuel ratio.

REFERENCES:
patent: 4263782 (1981-04-01), Matsumoto
patent: 4383515 (1983-05-01), Higashiyama
patent: 4522180 (1985-06-01), Matsuoka et al.
patent: 4696274 (1987-09-01), Sato

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