Air-fuel ratio control system
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United States of America Patent
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Issued Date -
Jun 14, 2012
app pub date -
Jul 15, 2011
filing date -
Jul 20, 2010
priority date (Note) -
Abandoned
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Abstract
Even if the engine structure is not capable of continuous operation in the vicinity of stoichiometric air-fuel ratio, this engine is in the stoichiometric combustion region when condition such as low load and stable engine rotation is met, and the feedback control using the O2 sensor, although temporary, becomes possible. Therefore, the air-fuel ratio control system performs this feedback, and derives and sets the constant value for correction to attain the air-fuel ratio suited to the engine. Thereafter, the optimal air-fuel ratio is controlled at the normal control mode just by correcting the fuel injection quantity using the constant value.
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