Control apparatus of internal combustion engine and control method thereof

A control apparatus of an internal combustion engine provided with a variable valve operating apparatus which variably changes a valve operating characteristic of at least one of an intake valve and an exhaust valve, comprising:

• intake pipe pressure detecting means for detecting an intake pipe pressure of said internal combustion engine;
• operating condition detecting means for detecting an operating condition of said internal combustion engine;
• reference intake pipe pressure computing means for computing a reference intake pipe pressure corresponding to a reference operating condition of said variable valve operating apparatus based on the detection value of the operating condition of said internal combustion engine;
• reference fresh air ratio computing means for computing a reference fresh air ratio corresponding to the reference operating condition of said variable valve operating apparatus based on the detection value of the operating condition of said internal combustion engine;
• fresh air ratio correction amount computing means for computing a fresh air ratio correction amount corresponding to an operating condition of said variable valve operating apparatus based on the detection value of said intake pipe pressure and said reference intake pipe pressure;
• fresh air ratio computing means for correcting said reference fresh air ratio based on said fresh air ratio correction amount to compute a final fresh air ratio;
• operating amount computing means for computing an operating amount of a control object in said internal combustion engine based on said final fresh air ratio;
• and
• operating means for operating said control object in said internal combustion engine by said operating amount.

A control method of an internal combustion engine provided with a variable valve operating apparatus which variably changes a valve operating characteristic of at least one of an intake valve and an exhaust valve,

• wherein an intake pipe pressure and an operating condition of said internal combustion engine are detected;
• a reference intake pipe pressure and a reference fresh air ratio corresponding to a reference operating condition of said variable valve operating apparatus are computed based on the detection value of the operating condition of said internal combustion engine,
• a fresh air ratio correction amount corresponding to an operating condition of said variable valve operating apparatus is computed based on the detection value of said intake pipe pressure and said reference intake pipe pressure,
• said reference fresh air ratio is corrected based on said fresh air ratio correction amount to compute a final fresh air ratio,
• an operating amount of a control object in said internal combustion engine is computed based on said final fresh air ratio, and
• said control object in said internal combustion engine is operated by said operating amount.