Intake air amount variation detector

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• injection amount control means for changing a fuel injection amount for a particular one of the cylinders from an injection amount for stoichiometric operation to either an increased amount or a decreased amount;
• computation means for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the injection amount control means;
• and
• output means for outputting the torque or rotation speed change amount determined by the computation means as an index value that indicates the degree of intake air amount variation in the particular cylinder.

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• injection amount control means for changing a fuel injection amount from an injection amount for stoichiometric operation to either an increased amount or a decreased amount;
• computation means for determining, on an individual cylinder basis, the amount of a torque or rotation speed change that occurs when the fuel injection amount is changed by the injection amount control means;
• and
• output means for outputting the torque or rotation speed change amount determined by the computation means as an index value that indicates the degree of intake air amount variation in an individual cylinder.

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• first injection amount control means for changing the fuel injection amount for a particular one of the cylinders from an injection amount for stoichiometric operation to an increased amount;
• first computation means for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the first injection amount control means;
• second injection amount control means, which, when the torque or rotation speed change amount determined by the first computation means is not greater than a predetermined reference value, decreases the fuel injection amount for the particular cylinder from the injection amount for stoichiometric operation;
• second computation means for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the second injection amount control means;
• and
• output means for outputting the torque or rotation speed change amount determined by the first computation means and the torque or rotation speed change amount determined by the second computation means as index values that indicate the degree of intake air amount variation in the particular cylinder.

An intake air amount variation detector for detecting intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• an injection amount control unit for changing a fuel injection amount from an injection amount for stoichiometric operation to either an increased amount or a decreased amount;
• a computation unit for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount is changed by the injection amount control unit;
• and
• an output unit for outputting the torque or rotation speed change amount determined by the computation unit as an index value that indicates the degree of intake air amount variations among the cylinders.

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• an injection amount control unit for changing a fuel injection amount for a particular one of the cylinders from an injection amount for stoichiometric operation to either an increased amount or a decreased amount;
• a computation unit for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the injection amount control unit;
• and
• an output unit for outputting the torque or rotation speed change amount determined by the computation unit as an index value that indicates the degree of intake air amount variation in the particular cylinder.

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• an injection amount control unit for changing a fuel injection amount from an injection amount for stoichiometric operation to either an increased amount or a decreased amount;
• a computation unit for determining, on an individual cylinder basis, the amount of a torque or rotation speed change that occurs when the fuel injection amount is changed by the injection amount control unit;
• and
• an output unit for outputting the torque or rotation speed change amount determined by the computation unit as an index value that indicates the degree of intake air amount variation in an individual cylinder.

An intake air amount variation detector for detecting the intake air amount variations among cylinders of a multiple-cylinder internal combustion engine, the device comprising:

• a first injection amount control unit for changing the fuel injection amount for a particular one of the cylinders from an injection amount for stoichiometric operation to an increased amount;
• a first computation unit for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the first injection amount control unit;
• a second injection amount control unit, which, when the torque or rotation speed change amount determined by the first computation unit is not greater than a predetermined reference value, decreases the fuel injection amount for the particular cylinder from the injection amount for stoichiometric operation;
• a second computation unit for determining the amount of a torque or rotation speed change that occurs when the fuel injection amount for the particular cylinder is changed by the second injection amount control unit;
• and
• an output unit for outputting the torque or rotation speed change amount determined by the first computation unit and the torque or rotation speed change amount determined by the second computation unit as index values that indicate the degree of intake air amount variation in the particular cylinder.