Patent ID: 6505604
Filing Date: 2003-01-14
Classification: F02D,F02P,Y02T

Abstract:
An ignition timing control apparatus for an internal combustion engine, comprising:an engine operating condition detecting element for detecting operating conditions of said engine; an intake air control valve provided in an intake passage of said engine; a swirl control element for controlling the opening and closing of said intake air control valve in accordance with said engine operating conditions detected by said engine operating condition detecting element thereby to adjust a magnitude of a swirl of intake air sucked into said engine; an ignition timing calculating element for determining ignition timing of said engine through interpolation using ignition timing map data corresponding to the number of revolutions per unit time of said engine and an engine load; a map data setting element for switching and setting said ignition timing map data in accordance with opening and closing of said intake air control valve; and an ignition timing retarding element for correcting said ignition timing by a prescribed retarded angle amount over a first predetermined period after a switching of said ignition timing map data.