Variable valve control apparatus for internal combustion engine and method thereof

A variable valve control apparatus for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising:

• a storage section that stores previously a correlation between a value equivalent to an opening area of said intake valve and a valve passing gas amount, corresponding to predetermined effective cylinder capacity;
• a conversion section that converts said value equivalent to the opening area of said intake valve into the valve passing gas amount by referring to said correlation;
• a correction section that corrects said value equivalent to the opening area based on a ratio between the valve passing gas amount obtained in said conversion section and a requested valve passing gas amount;
• a calculating section that calculates requested effective cylinder capacity by which said requested valve passing gas amount can be obtained based on said value equivalent to the opening area, based on the valve passing gas amount obtained by referring to said correlation based on the value equivalent to the opening area corrected in said correction section, and said requested valve passing gas amount;
• and
• a control section that controls said variable valve mechanism according to the requested effective cylinder capacity calculated in said calculating section.

A variable valve control apparatus for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising:

• first calculating means for calculating an amount of fresh air flowing into a cylinder of said engine;
• second calculating means for calculating a gas amount spit-back to an intake side from the inside of the cylinder when said intake valve is opened;
• third calculating means for calculating said gas amount passing through said intake valve based on said fresh air amount and an amount of predetermined times the spit-back gas amount of the time when said intake valve is opened;
• and
• control means for controlling said variable valve mechanism based on said gas amount passing through said intake valve.

A variable valve control apparatus for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising:

• storage means for storing previously a correlation between a value equivalent to an opening area of said intake valve and a valve passing gas amount, corresponding to predetermined effective cylinder capacity;
• conversion means for converting said value equivalent to the opening area of said intake valve into the valve passing gas amount by referring to said correlation;
• correction means for correcting said value equivalent to the opening area based on a ratio between the valve passing gas amount obtained by said conversion means and a requested valve passing gas amount;
• calculating means for calculating requested effective cylinder capacity by which said requested valve passing gas amount ca be obtained based on said value equivalent to the opening area, based on the valve passing gas amount obtained by referring to said correlation based on the value equivalent to the opening area corrected by said correction means, and said requested valve passing gas amount;
• and
• control means for controlling said variable valve mechanism according to the requested effective cylinder capacity calculated by said calculating means.

A variable valve control method for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising the steps of:

• calculating an amount of fresh air flowing into a cylinder of said engine;
• calculating a gas amount spit-back to an intake side from the inside of the cylinder when said intake valve is opened;
• calculating said gas amount passing through said intake valve based on said fresh air amount and an amount of predetermined times the spit-back gas amount of the time when said intake valve is opened;
• and
• controlling said variable valve mechanism based on said gas amount passing through said intake valve.

A variable valve control method for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising the steps of:

• calculating an amount of fresh air flown into a cylinder based on a requested torque;
• calculating a gas amount spit-back to an intake side from the inside of the cylinder when said intake valve is opened, based on a requested residual gas rate;
• calculating a requested gas amount passing through said intake valve, based on an amount of predetermined times the spit-back gas amount of the time when said intake valve is opened and said fresh air amount;
• setting a target operating characteristic of said intake valve based on said requested valve passing gas amount;
• and
• controlling said variable valve mechanism based on said target operating characteristic.

A variable valve control method for an internal combustion engine provided with a variable valve mechanism that varies an operating characteristic of an intake valve, for controlling a gas amount passing through said intake valve by variably controlling said operating characteristic, comprising the steps of:

• storing previously a correlation between a value equivalent to an opening area of said intake valve and a valve passing gas amount, corresponding to predetermined effective cylinder capacity;
• converting said value equivalent to the opening area of said intake valve into the valve passing gas amount by referring to said correlation;
• correcting said value equivalent to the opening area based on a ratio between the converted valve passing gas amount and a requested valve passing gas amount;
• calculating requested effective cylinder capacity by which said requested valve passing gas amount can be obtained based on said value equivalent to the opening area, based on the valve passing gas amount obtained by referring to said correlation based on the corrected value equivalent to the opening area, and said requested valve passing gas amount;
• and
• controlling said variable valve mechanism according to the requested effective cylinder capacity calculated.