Cylinder-by-cylinder air-fuel ratio-estimating system for intern

Details Cylinder-by-cylinder air-fuel ratio-estimating system for intern Cylinder-by-cylinder air-fuel ratio-estimating system for intern

1997-08-06

1998-09-29

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123684, 123687, 701109, F02D 4114

Patent

active

058133895

ABSTRACT:
A cylinder-by-cylinder air-fuel ratio-estimating system for an internal combustion engine includes an air-fuel ratio sensor arranged in the exhaust system of the engine, at a confluent portion of the exhaust system. The air-fuel ratio of a mixture supplied to each of the cylinders of the engine is estimated based on an output from the air-fuel ratio sensor, by using an observer for observing the internal operative state of the exhaust system based on a model representative of the behavior of the exhaust system. A gain for use in the estimation of the air-fuel ratio of the mixture supplied to each of the cylinders is estimated by the observer according to operating conditions of the engine.

REFERENCES:
patent: 5448978 (1995-09-01), Hasegawa et al.
patent: 5524598 (1996-06-01), Hasegawa et al.
patent: 5531208 (1996-07-01), Hasegawa et al.
patent: 5540209 (1996-07-01), Hasegawa et al.
patent: 5548514 (1996-08-01), Hasegawa et al.
patent: 5566071 (1996-10-01), Akazaki et al.

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