Air-fuel ratio control device of internal combustion engine

Details Air-fuel ratio control device of internal combustion engine Air-fuel ratio control device of internal combustion engine

2008-11-06

2010-06-22

Kwon, John T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S674000

Reexamination Certificate

active

07742870

ABSTRACT:
A dead time in the case where an output of an air-fuel ratio sensor changes in a lean direction and a dead time in the case where the output changes in a rich direction are sensed respectively. The number of elements constituting data of past feedback correction amounts used for calculating a present feedback correction amount is changed in accordance with the larger one of the dead times. A lean direction response time and a rich direction response time are sensed respectively. A control gain is corrected in accordance with the lean direction response time when the output of the air-fuel ratio sensor changes in the lean direction. The control gain is corrected in accordance with the rich direction response time when the output changes in the rich direction.

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