Patent ID: 6588403
Filing Date: 2003-07-08
Classification: F02D,Y02T

Abstract:
An engine fuel injection control device comprising:basic fuel injection amount calculation means for calculating a basic fuel injection amount from engine rotational speed and from an amount of accelerator operation; air intake amount detection means arranged in an air intake pipe of an engine for detecting an air intake amount admitted to the engine; inferred air intake amount calculation means for calculating an inferred air intake amount inferred to be admitted to the engine by using a target fuel injection amount on the occasion prior to a current occasion and the rotational speed of the engine; final air intake amount determination means for comparing an air amount deviation between the detected air intake amount detected by the air intake amount detection means and the inferred air intake amount calculated by the inferred air intake amount calculation means, with a predetermined value, and for determining the detected air intake amount as a final air intake amount in response to the air intake amount deviation being at or below the predetermined value and determining the inferred air intake amount as the final air intake amount in response to the air intake amount deviation being larger than the predetermined value; smoke limit fuel injection amount calculation means for calculating a smoke limit fuel injection amount at which injection can be achieved in relation to the final air intake amount determined by the final air intake amount determining means, said smoke limit fuel injection amount being regarded as a limit value at which smoke occurs; and target fuel injection amount setting means for comparing the basic fuel injection amount calculated by the basic fuel injection amount calculating means with the smoke limit fuel injection amount, and for setting the smaller of these values as a current target fuel injection amount.