Device for controlling the air-fuel ratio of an internal combustion engine
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United States of America Patent
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Feb 4, 2003
Grant Date -
N/A
app pub date -
Nov 17, 2000
filing date -
Jun 7, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A device for controlling the air-fuel ratio of an internal combustion engine, which is capable of highly precisely finding learning correction values in an open-loop operation region by using an ordinary air-fuel ratio sensor. The device comprises means 22 for correcting the amount of fuel depending upon a target air-fuel ratio AFo, means 23 for determining the conditions CF for controlling the air-fuel ratio feedback of the internal combustion engine depending upon the operation conditions, means 24 for controlling the air-fuel ratio feedback in the feedback operation region, and means 25 for finding learning correction values Zs for every operation region based on the control quantity AFc of the feedback control means, wherein the feedback control operation is executed in the open-loop operation region, and the learning correction values in the open-loop operation region are found during the feedback control operation that lasts only temporarily.
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