Fuel supply system for engine, fuel injection control device for engine, and fuel supply method for engine

A fuel injection control device for an engine, the fuel injection control device being configured to control a fuel injection amount of a fuel injector configured to supply fuel into a combustion chamber of the engine,

• the fuel injection control device comprising circuitry configured to
• set a basic injection amount of the fuel injector on a basis of an intake air amount of the engine,
• execute a fuel cut that stops injection of the fuel by the fuel injector if a predetermined fuel cut condition is satisfied,
• end the fuel cut if a predetermined fuel cut end condition is satisfied,
• perform, on a basis of a reverse air amount from an exhaust channel of the engine to the combustion chamber during execution of the fuel cut, an increase correction on the fuel injection amount at initial fuel injection by the fuel injector upon end of the fuel cut in at least one cylinder of the engine, with respect to the basic injection amount, an amount of the increase correction being greater at the initial fuel injection than in fuel injection at a second time and onward, and
• output, to the fuel injector, a drive signal corresponding to the fuel injection amount that has undergone the increase correction.

A fuel supply method for an engine, the fuel supply method being configured to control a fuel amount at which a fuel injector supplies fuel to a combustion chamber of the engine, the fuel supply method comprising:

• detecting an intake air amount of the engine;
• setting a basic value of the fuel amount on a basis of the detected intake air amount;
• executing a fuel cut that stops supply of the fuel by the fuel injector if a predetermined fuel cut condition is satisfied;
• ending the fuel cut if a predetermined fuel cut end condition is satisfied;
• performing, on a basis of a reverse air amount from an exhaust channel of the engine to the combustion chamber during execution of the fuel cut, an increase correction on a fuel supply amount from the fuel injector upon end of the fuel cut in at least one cylinder of the engine, with respect to the basic value, an amount of the increase correction being greater at an initial fuel supply than in fuel supply at a second time and onward;
• and
• controlling an operation regarding supply of the fuel by the fuel injector on a basis of the fuel supply amount that has undergone the increase correction.