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A fuel feed control system and method for an internal combustion engine is provided with a device for setting the quantity of fuel and a fuel injector for feeding fuel in accordance with the fuel quantity set by the fuel quantity setting device. The fuel quantity setting device is provided with a de

A fuel feed control system and method for an internal combustion engine is provided with a device for setting the quantity of fuel and a fuel injector for feeding fuel in accordance with the fuel quantity set by the fuel quantity setting device. The fuel quantity setting device is provided with a device for estimating the quantity of air to be inducted on the basis of the result of detection of the quantity of inducted air at an inducted air quantity detection time, inducted air quantity information detected before the inducted air quantity detection time and predicted information. The inducted air quantity estimation device is provided with a device for changing the predicted information so that, when a transient operation state of the engine is detected by a transient operation state detector, the estimated quantity of inducted air and a real quantity of inducted air become closer to each other. The control system permits setting of an accurate injection quantity of fuel by precisely measuring a quantity of inducted air even when the state of operation of the engine is in a transition period.

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A fuel feed control system for a multi-cylinder internal combustion engine, comprising: fuel quantity setting means for setting a quantity of fuel to be fed at a desired fuel feeding time in an induction stroke of the internal combustion engine on the basis of inducted air quantity information detec

A fuel feed control system for a multi-cylinder internal combustion engine, comprising: fuel quantity setting means for setting a quantity of fuel to be fed at a desired fuel feeding time in an induction stroke of the internal combustion engine on the basis of inducted air quantity information detected at a desired inducted air quantity detection time before an end of the induction stroke, and means for feeding, at the desired fuel feeding time, fuel in the quantity set by the fuel quantity setting means; wherein said fuel quantity setting means is provided with inducted air estimation means for estimating information on a quantity of air, which is to be inducted during the induction stroke corresponding to the desired fuel feeding time, on the basis of a result of detection of an inducted air quantity at the desired inducted air quantity detection time, inducted air quantity information detected before the desired inducted air quantity detection time and predicted information, and said inducted air estimation means is provided with transient operation state detection means for detecting a transient operation state of the internal combustion engine and predicted information changing means for changing the predicted information so that, upon detection of the transient operation state of the internal combustion engine by said transient operation state detection means, the estimated quantity of inducted air and a corresponding real quantity of inducted air become closer to each other.