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

1998-09-15

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123687, 123694, 701109, F02D 4114

Patent

active

058065067

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 is estimated based the 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 air-fuel ratio at the confluent portion is estimated by using a delay parameter representative of the response delay of the air-fuel ratio sensor, and the air-fuel ratio of the mixture supplied to each of the cylinders is estimated by using the estimated air-fuel ratio at the confluent portion. The estimated air-fuel ratio of the mixture supplied to each of the cylinders is subsequently used for estimating a value of the air-fuel ratio at the confluent portion of the exhaust system.

REFERENCES:
patent: 5623913 (1997-04-01), Kitajima et al.
patent: 5636621 (1997-06-01), Maki et al.

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