CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Nov 15, 2012
app pub date -
Sep 24, 2010
filing date -
Dec 18, 2009
priority date (Note) -
Abandoned
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Abstract
A control system for an internal combustion engine having a throttle valve disposed in an intake passage of the engine is provided. A wide-open intake air amount, which is an intake air amount corresponding to a state where the throttle valve is fully opened, is calculated according to the engine rotational speed, and a theoretical intake air amount, which is an intake air amount corresponding to a state where no exhaust gas of the engine is recirculated to a combustion chamber of the engine, is calculated according to the wide-open intake air amount and the intake pressure. An actual intake air amount of the engine is detected or estimated, and an exhaust gas recirculation ratio is calculated using the theoretical intake air amount and the actual intake air amount. The engine is controlled using the calculated exhaust gas recirculation ratio.
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