Internal combustion engine

An internal combustion engine comprising:

• an engine body;
• an ignition plug of which an electrode portion is disposed in a combustion chamber of the engine body;
• a first fuel injection valve configured to inject fuel into a suction passage of the engine body;
• a second fuel injection valve configured to inject fuel into the combustion chamber;
• and
• an electronic control unit configured to
• when lean burn is performed by injecting homogenization fuel for forming a homogeneous air-fuel mixture in the combustion chamber from the first fuel injection valve and injecting ignition fuel for forming an ignition air-fuel mixture near the electrode portion from the second fuel injection valve, supply part of the homogenization fuel to the combustion chamber as cooling fuel in accordance with an engine operating status,
• when the cooling fuel is supplied to the combustion chamber, calculate a target amount of supply of the cooling fuel and calculate a first upper limit injection amount that is an upper limit of an amount of fuel allowed to be injected from the second fuel injection valve as the cooling fuel,
• when the target amount of supply is less than or equal to the first upper limit injection amount, supply the cooling fuel in the entire target amount of supply from the second fuel injection valve to the combustion chamber in a first injection mode in which single-stage injection is performed, and
• when the target amount of supply is greater than the first upper limit injection amount, supply the cooling fuel to the combustion chamber in a second injection mode in which the cooling fuel more easily diffuses than in the first injection mode.