FUEL CONTROLLER OF INTERNAL COMBUSTION ENGINE

PURPOSE: To enable it to check any lean shift in an air-fuel ratio favorably by calculating the extent of differential pressure between intake pipe pressure and fuel pressure at a time when intake pipe internal pressure is in a certain one specified pressure of less than the atmospheric pressure and the invalid injection time of an injector on the basis of a battery voltage, and finding the final fuel injection time. CONSTITUTION: In an electronic control unit 40, voltage VB in a battery 50 is detected, and any invalid injection time to the battery voltage VB is retrieved in order to cope with the extent of differential pressure between intake pressure and fuel pressure at a time when an engine 10 is in an idling state and a throttle valve 13 is fully closed. In addition, a fundamental fuel injection quantity corresponding to each output of a turning angle sensor 31 and an intake pressure sensor 32 is calculated. Then, this basic value is compensated by the presence of acceleration of a vehicle, engine temperature, and a feedback compensation factor for air-fuel ratio compensation, etc., and the obtained fuel injection quantity is added and compensated by the invalid injection time, whereby a final driving time for an injector 4 is calculated.