Air/fuel ratio feedback control system for internal combustion e

Details Air/fuel ratio feedback control system for internal combustion e Air/fuel ratio feedback control system for internal combustion e

1990-10-18

1993-07-13

Lall, Parshotam S.

Boots, shoes, and leggings

123693, 123696, F02D 4500

Patent

active

052279758

ABSTRACT:
An air/fuel ratio feedback control system for an internal combustion engine sets an air/fuel ratio feedback correction coefficient on the basis of an air/fuel ratio for an air/fuel mixture introduced into a combustion chamber of the engine, to cause the air/fuel ratio to approach a set point thereof. The correction coefficient consists of a rich control proportional component P.sub.R, a lean control proportional component P.sub.L and an integral component I. When the air/fuel ratio set by the feedback control system deviates from an initial set point (the stoichiometric value) due to deterioration of an oxygen sensor for detecting the air/fuel ratio, the feedback control system compensates for the deviation to cause the air/fuel ratio to approach the initial set point, by varying a ratio of the rich control proportional component P.sub.R to the lean control proportional component P.sub.L in accordance with magnitudes of rich and lean detection levels, or by correcting a balance between the rich and lean control proportional components P.sub.R and P.sub.L on the basis of a relationship between signal level varying speeds of the proportional components P.sub.R and P.sub.L, a relationship between rich and lean control times, a relationship between rich and lean detection levels or the like.

REFERENCES:
patent: 4029061 (1977-06-01), Asano
patent: 4174680 (1979-11-01), Anzai
patent: 4534330 (1985-08-01), Osuga et al.
patent: 4671244 (1987-06-01), Clement et al.
patent: 4853862 (1989-08-01), Shiraishi et al.

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