Internal combustion engine controller
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United States of America Patent
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Feb 12, 2013
Grant Date -
Aug 20, 2009
app pub date -
Dec 29, 2008
filing date -
Feb 15, 2008
priority date (Note) -
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Abstract
A controller of an internal combustion engine operable by an alcohol-containing fuel, includes: an alcohol concentration detecting unit, operable to detect an alcohol concentration of the alcohol-containing fuel; a feedback controller, operable to perform feedback control to make an exhaust air-fuel ratio of the internal combustion engine become equal to a target air-fuel ratio in accordance with an operation region; and an operation region setting unit, operable to set a stoichiometric operation region, in which the target air-fuel ratio is stoichiometric, in an enlarged manner when the alcohol concentration, detected by the alcohol concentration detecting unit, is higher than a concentration.
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