To rapidly converge number of revolution on a target number of revolution without ultimately dropping the number of revolution independently of how it drops upon transition of number of revolution to idle state.
A judging means 32 judges whether correction of the quantity of supply air is to be started or not upon transition of number of revolution to idle state. Then, if it is judged that the quantity of supply air is to be started, based on a control method wherein the quantity of supply air and engine torque is subjected to the normal model using a dinamic engine model to or from which the quantity of supply air and engine torque are input or output, the quantity of supply air QALL is then computed by a computation unit so that engine torque coincides with demanded engine torque in idling state when the engine number of revolution detected by an engine number of revolution detecting means 31 reaches to idle number of revolution, and the quantity of supply air QALL is supplied to the engine buy a suply means 34.
TAKAHASHI NOBUTAKA
AKAHORI KOICHI
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