Apparatus and method for controlling fuel injection of internal combustion engine, and internal combustion engine

An internal combustion engine comprising:

• a combustion chamber in which air-fuel mixture is burned;
• a fuel injection valve that injects fuel into the combustion chamber;
• and
• a controller, wherein, to cause an actual air-fuel ratio of air-fuel mixture burned in the combustion chamber to be equal to a target value, the controller corrects a fuel injection amount from the fuel injection valve using a feedback correction value, the feedback correction value being changed based on the actual air-fuel ratio,
• wherein the controller computes, as a limit value, a value of the feedback correction value that causes a fuel injection time, which is an instruction sent to the fuel injection valve, to be a permissible minimum time, and wherein, when the fuel injection time is less than the permissible minimum time, the controller limits the lowest value of the feedback correction value to the limit value.

A method for controlling fuel injection of an internal combustion engine, the engine having a fuel injection valve, the method comprising:

• correcting a fuel injection amount from the fuel injection valve using a feedback correction value to cause an actual air-fuel ratio of air-fuel mixture burned in the engine to be equal to a target value, the feedback correction value being changed based on the actual air-fuel ratio;
• computing, as a limit value, a value of the feedback correction value that causes a fuel injection time, which is an instruction sent to the fuel injection valve, to be a permissible minimum time;
• and
• limiting the lowest value of the feedback correction value to the limit value when the fuel injection time is less than the permissible minimum time.