Fuel injection control device for an internal combustion engine with throttle opening detection means

A fuel injection control device for an internal combustion engine having an intake air passage with a throttle valve and a fuel injector arranged therein, said device comprising:

• a first detecting means for detecting a degree of opening of said throttle valve;
• a second detecting means for detecting a flow of intake air in said intake air passage in units of a certain physical quantity;
• a third detecting means for detecting whether or not the engine is operating in a steady state;
• means for estimating a load of the engine from an output of said first detecting means in accordance with a predetermined estimation to provide a load estimation value represented by said units;
• learning means for correcting the load estimation value provided by the estimating means based on the output of said second detecting means when said third detecting means detects that the engine is operating in a steady state;
• and
• means for calculating an amount of fuel to be injected in response to the most recently corrected load estimation value obtained from the output of said first detecting means.