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

1997-07-25

1999-09-07

Solis, Erick R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123481, 123679, F02D 4114

Patent

active

059470950

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. 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. The estimated air-fuel ratio of the mixture supplied to each of the cylinders is initialized to a value corresponding to the output from the air-fuel ratio sensor, depending upon operating conditions of the engine.

REFERENCES:
patent: 4934328 (1990-06-01), Ishii et al.
patent: 5126943 (1992-06-01), Nakaniwa
patent: 5651353 (1997-07-01), Allston
patent: 5673676 (1997-10-01), Mukumoto
patent: 5781875 (1998-07-01), Maki et al.

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