Air-fuel ratio control apparatus for multicylinder internal combustion engine
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United States of America Patent
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-
Dec 11, 2001
Grant Date -
N/A
app pub date -
Oct 6, 2000
filing date -
Oct 8, 1999
priority date (Note) -
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Abstract
An object system is regarded as being equivalent to a system for generating an output of an O.sub.2 sensor or exhaust gas sensor from a target combined air-fuel ratio that is produced by combining target air-fuel ratios KCMD for respective cylinder groups according to a filtering process of the mixed model type. With the equivalent system as an object to be controlled, an air-fuel ratio processing controller determines a target combined air-fuel ratio, and determines a target air-fuel ratio KCMD for each of the cylinder groups from the target combined air-fuel ratio. The air-fuel ratios in the cylinder groups are manipulated into the target air-fuel ratio according to a feed-forward control process.
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