Air-fuel ratio controller for internal combustion engine

Details Air-fuel ratio controller for internal combustion engine Air-fuel ratio controller for internal combustion engine

2008-04-15

2008-04-15

Argenbright, T. M (Department: 3747)

Power plants

Internal combustion engine with treatment or handling of...

Methods

C060S276000, C123S673000, C701S109000

Reexamination Certificate

active

11483602

ABSTRACT:
A target air-fuel ratio setting part has a sub-feedback part, a target air-fuel ratio enriching part, and a target air-fuel ratio changeover part. The sub-feedback part variably sets a target air-fuel ratio upstream of a catalyst on the basis of a detection signal of an O2 sensor provided downstream of the catalyst. The target air-fuel ratio changeover part uses, as the target air-fuel ratio, a rich target air-fuel ratio which is set by the target air-fuel ratio enriching part on conditions such that the target air-fuel ratio set by the sub-feedback part is rich. A cylinder-by-cylinder air-fuel ratio estimation part calculates a cylinder-by-cylinder air-fuel ratio on the basis of a detection value of an air-fuel ratio sensor and the target air-fuel ratio.

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