Idling control apparatus of internal combustion engine

摘要

An idling control apparatus of an internal combustion engine which undergoes an after-start lean-burn control for operating the internal combustion engine at an air-fuel ratio on a lean side of a theoretical air-fuel ratio after the engine started. According to the apparatus, the engine rotational speed under the after-start lean-burn control at a low temperature is stabilized, fluctuation of the engine rotational speed at a time when a lean-burn control is canceled is restrained, and a smooth idling state is realized always. The apparatus comprises an idling engine rotational speed control means which calculates a control amount for controlling the engine rotational speed on idling to a target engine rotational speed and carries out a feedback control by the calculated control amount, an after-start lean-burn control discriminating means for discriminating whether the after-start lean-burn control ia carried out after starting of the engine or not, and a correcting means which calculates a correction amount for correcting the control amount of the idling engine rotational speed control means in accordance with a result of discrimination of the after-start lean-burn control discriminating means, thereby the idling engine rotational speed is controlled by the control amount corrected by the correcting means. <IMAGE>