Method and device for feedback controlling air-fuel ratio of internal combustion engine
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United States of America Patent
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Mar 23, 2004
Grant Date -
Jan 10, 2002
app pub date -
Jul 5, 2001
filing date -
Jul 7, 2000
priority date (Note) -
Expired
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Abstract
An air-fuel ratio detected by an air-fuel ratio sensor is estimated based on an estimation value of air-fuel ratio of an air-fuel mixture formed inside a cylinder, and based on an air-fuel ratio estimated as being detected by this air-fuel ratio sensor and the air-fuel ratio detected based on an output signal of the air-fuel ratio sensor, the estimation value of the cylinder air-fuel ratio is corrected and a fuel injection quantity is corrected based on the corrected cylinder air-fuel ratio.
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