Fuel injection amount control method and apparatus for internal combustion engine

A system for determining a fuel injection amount for an internal combustion engine having a plurality of cylinders that are classified into at least two cylinder groups, comprising:

• a fuel injection amount sub-system that determines an amount of fuel injected from each of the cylinder groups based on an amount of air provided to a common intake passage of the engine;
• a distributed air amount sub-system that determines an amount of air distributed to each of the cylinder groups based on an operating state of the engine;
• and
• a corrected fuel injection amount sub-system that determines a corrected fuel injection amount based on the determined amount of air distributed.

A method for controlling a fuel injection amount for an internal combustion engine having a plurality of cylinders that are classified into at least two cylinder groups, the method comprising:

• detecting an amount of air supplied to a common intake passage for the engine;
• detecting an operating state of the engine;
• determining an amount of fuel injected from each of the cylinder groups based on the detected amount of air;
• determining an amount of air distributed to each of the cylinder groups based on the detected operating state;
• determining a corrected fuel injection amount based on the calculated amount of air distributed;
• and
• injecting fuel into each of the cylinder groups based on the corrected fuel injection amount.