Abstract: The position of an engine throttle valve is detected. The rate of fuel supply to an engine is increased when the engine moves into a preset condition, e.g., when the engine is required to increase its power output. This increase in the fuel supply rate is enable and disabled in accordance with the detected throttle valve position.

Abstract: An apparatus for controlling an internal combustion engine having starter switch. The apparatus includes a control circuit for calculating a value corresponding to the amount of fuel supplied to the engine in time during which the engine is starting. The calculated value is modified in a direction decreasing the amount of fuel supplied to the engine when the interval between the time when the starter switch is turned on and the time when the engine stalls is equal to or less than a predetermined value and the interval between the time when the engine stalls and the time when the starter switch is turned on is equal to or less than a predetermined value.

Abstract: An apparatus for use in an internal combustion engine including a single fuel injector provided for supplying fuel to an internal combustion engine upstream of an intake manifold connected to a plurality of cylinders. The apparatus includes a control circuit for provide a commend to cause the fuel injector to inject supplemental fuel to the engine in response to a demand for engine acceleration in order to provide a good acceleration performance. The amount of the supplemental fuel supplied to the engine is decreased in a manner to avoid creation of an overrich mixture in the cylinders when a demand for engine acceleration occurs again in a short time after the throttle valve closes to an angle less than a predetermined value.