Control apparatus and control method for variable valve mechanism

A control apparatus for a variable valve mechanism that varies a valve characteristic of an engine valve, comprising:

• a feedforward manipulated variable calculating unit that calculates a feedforward manipulated variable according to a dynamic characteristic of the variable valve mechanism;
• an actual manipulated variable calculating unit that calculates an actual manipulated variable that can be output by the variable valve mechanism;
• a corrective manipulated variable calculating unit that calculates a corrective manipulated variable for correcting a difference between the calculated feedforward manipulated variable and the actual manipulated variable while changing the valve characteristic of the engine valve by controlling the variable valve mechanism;
• and
• a feedforward manipulated variable correcting unit that corrects the feedforward manipulated variable according to the corrective manipulated variable after the corrective manipulated variable is calculated;
• wherein the corrective manipulated variable calculating unit calculates, as the corrective manipulated variable, an integrated value of saturating amount obtained by subtracting the actual manipulated variable from the feedforward manipulated variable in the case in which the feedforward manipulated variable exceeds the actual manipulated variable.

A control apparatus for a variable valve mechanism that varies a valve characteristic of an engine valve, comprising:

• feedforward manipulated variable calculating means that calculates a feedforward manipulated variable according to a dynamic characteristic of the variable valve mechanism;
• actual manipulated variable calculating means that calculates an actual manipulated variable that can be output by the variable valve mechanism;
• corrective manipulated variable calculating means that calculates a corrective manipulated variable for correcting a difference between the calculated feedforward manipulated variable and the actual manipulated variable while changing the valve characteristic of the engine valve by controlling the variable valve mechanism;
• and
• feedforward manipulated variable correcting means that corrects the feedforward manipulated variable according to the corrective manipulated variable after the corrective manipulated variable is calculated
• wherein the corrective manipulated variable calculating means calculates, as the corrective manipulated variable, an integrated value of saturating amount obtained from the actual and feedforward manipulated variables when the feedforward manipulated variable differs in a particular way from the actual manipulated variable.

A control method for a variable valve mechanism that varies a valve characteristic of an engine valve, comprising the steps of:

• calculating a feedforward manipulated variable according to the dynamic characteristic of the variable valve mechanism;
• calculating an actual manipulated variable that can be output by the variable valve mechanism;
• calculating a corrective manipulated variable for correcting a difference between the calculated feedforward manipulated variable and the actual manipulated variable while changing the valve characteristic of the engine valve by controlling the variable valve mechanism;
• and
• correcting the feedforward manipulated variable according to a corrective manipulated variable after the corrective manipulated variable is calculated
• wherein the step of calculating the corrective manipulated variable includes calculating, as the corrective manipulated variable, an integrated value of saturating amount obtained from the actual and feedforward manipulated variables when the feedforward manipulated variable differs in a particular way from the actual manipulated variable.

A control method for a variable valve mechanism that varies a valve characteristic of an engine valve, comprising the steps of:

• calculating a feedforward manipulated variable according to the dynamic characteristic of the variable valve mechanism;
• calculating an actual manipulated variable that can be output by the variable valve mechanism;
• calculating a corrective manipulated variable for correcting a difference between the calculated feedforward manipulated variable and the actual manipulated variable while changing the valve characteristic of the engine valve by controlling the variable valve mechanism;
• and
• correcting the feedforward manipulated variable according to a corrective manipulated variable after the corrective manipulated variable is calculated;
• wherein the step of calculating the corrective manipulated variable calculates, as the corrective manipulated variable, an integrated value of saturating amount obtained by subtracting the actual manipulated variable from the feedforward manipulated variable in the case in which the feedforward manipulated variable exceeds the actual manipulated variable.