Fuel injection apparatus for internal combustion engine

A fuel injection apparatus for an internal combustion engine including:

• a fuel injector having a leading end portion that has an internal space in which fuel is accumulated and an injection port for injecting fuel;
• and an adsorbent disposed in the internal space, the adsorbent being capable of selectively adsorbing an alcohol component in a blended fuel of gasoline and alcohol, the fuel injection apparatus controlling an injection amount from the fuel injector such that an air-fuel ratio of the internal combustion engine is a control target air-fuel ratio based on an alcohol concentration of the blended fuel to be supplied to the fuel injector, the adsorbent having a characteristic that an adsorbed amount of alcohol is small when a fuel pressure is low and large when the fuel pressure is high, the fuel injection apparatus comprising:
• a device for determining whether or not there is a request for desorbing alcohol adsorbed onto the adsorbent;
• a device for bringing the fuel pressure to a predetermined low fuel pressure if it is determined that there is the request;
• a device for estimating an amount of alcohol to be desorbed from the adsorbent;
• and
• a device for correcting any deviation in an air-fuel ratio of the internal combustion engine based on the desorbed amount of alcohol.