DIGITAL AID.

摘要

A device for controlling the engine speed in idling of an internal combustion engine to which so-called ''modern control theory'' is applied, and is directed to improve drastically the converging speed to a target number of revolution. The present invention updates the values of state variables even in an open-loop control state, to calculate initial values at the time of shift to feedback control. When a change of state of an external load is detected, an integration value is corrected in a feed-forward manner before it is limited to a predetermined range integration value limiting means in accordance with such a change of state. The present invention divides dynamic model for a control system into a dead time portion and a portion after the dead time portion, and identifies the dynamic model by a discrete system for each of these portions to configurate it.