Air/fuel ratio control system for internal combustion engine

Details Air/fuel ratio control system for internal combustion engine Air/fuel ratio control system for internal combustion engine

1995-07-07

1997-04-15

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123696, F01N 328

Patent

active

056198523

ABSTRACT:
In an air/fuel ratio control system for an internal combustion engine, having a second air/fuel ratio sensor disposed downstream of a catalytic converter, a computing type used for computing a second air/fuel ratio correction quantity in accordance with an output of the second air/fuel ratio sensor is switched in such a manner that the second air/fuel ratio quantity is set larger when the output of the second air/fuel ratio sensor is outside a reference level range than when the output of the second air/fuel ratio sensor is within the reference level range.

REFERENCES:
patent: 3990411 (1976-11-01), Toelle
patent: 4224910 (1980-09-01), O'Brien
patent: 4748953 (1988-06-01), Osuga
patent: 5144915 (1992-09-01), Grabs
patent: 5207056 (1993-05-01), Benninger
patent: 5239975 (1993-08-01), Mallebrein

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