Cylinder-by-cylinder air-fuel ratio calculation apparatus...

Details Cylinder-by-cylinder air-fuel ratio calculation apparatus... Cylinder-by-cylinder air-fuel ratio calculation apparatus...

2006-05-30

2006-05-30

Solis, Erick (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C701S109000

Reexamination Certificate

active

07051725

ABSTRACT:
An air-fuel ratio deviation calculated by an air-fuel ratio deviation calculation part is inputted to a cylinder-by-cylinder air-fuel ratio estimation part. A cylinder-by-cylinder air-fuel ratio is estimated in the cylinder-by-cylinder air-fuel ratio estimation part. In the cylinder-by-cylinder air-fuel ratio estimation part, attention is paid to gas exchange in an exhaust collective part of an exhaust manifold, and a model is created. In this model, a detection value of an A/F sensor is obtained by multiplying histories of the cylinder-by-cylinder air-fuel ratio of an inflow gas in the exhaust collective part and histories of the detection value of the A/F sensor by specified weights respectively and by adding them. The cylinder-by-cylinder air-fuel ratio is estimated on the basis of the model.

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Office Action dated Sep. 30, 2005 in U.S. Appl. No. 11/001,647.

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