Abstract: A setting device of basic fuel injection amount for an internal combustion engine in an operating region of acceleration comparing a detected amount of intake airflow with a retrieved amount of intake airflow stored with the area of opening of a throttle valve and the engine velocity used as parameter, and when the detected amount is less than the retrieved amount, modifying the detected amount on the basis of the change ratio of opening area in the throttle valve, the engine load and the engine velocity, thereby modifying the detected amount so that it is close to the amount required by the engine.

Abstract: An electronically controlled fuel injection device for an internal combustion engine during engine acceleration determines a basic amount of injected fuel based on the amount of intake airflow detected by an airflow meter and the engine velocity until the portion filled into the intake air manifold is detected, and then a basic amount of injected fuel based on the data of intake airflow which has been recorded excluding the portion filled into the intake air manifold.

Abstract: An apparatus for learn-controlling the air-fuel ratio for an internal combustion engine is disclosed. Every time area-wise learning correction coefficients for a predetermined number of different engine running condition areas are corrected, it is judged whether or not the deviations of the present area-wise learning correction coefficients for said areas from a reference value have the same direction. If all the deviations have the same direction, a mean value of said deviations or a minimum value among the deviations in terms of the absolute value is calculated. The calculated mean or minimum value is added to a global learning correction coefficient stored in global learning correction coefficient storing means to thereby rewrite the stored data. The mean or minimum value is regarded as a deviation component due to a change in the air density which may uniformly be employed for all the areas and is substituted for the global learning correction coefficient.