Patent ID: 6575150
Filing Date: 2003-06-10
Classification: F02D,F02P,Y02T

Abstract:
An ignition control device for an internal combustion engine, the internal combustion engine comprising a spark plug provided in a combustion chamber and an ignition coil supplying an ignition current to the spark plug, the ignition coil controlling an ignition current supplied to the spark plug based on a supplied primary current; the ignition control device comprising:a first sensor detecting a rotation speed of the engine crankshaft; a second sensor detecting a transient operating state of the engine; and a controller which functions to determine a transient engine operating state based on the output of the second sensor; calculate the basic ignition timing based on the rotation speed; set an advance limit which is the maximum value of the advance on the ignition timing to a different value during a transient operating state and during a steady-state operating state, the value during a transient operating state being the larger value; set the ignition timing by using the limit to restrict the advance on the basic ignition timing, the basic ignition timing being calculated based on the rotation speed; calculate a dwell angle comprising the period of application of an ignition current in response to the rotation speed; and control the primary current supplied to the ignition coil based on the ignition timing and the dwell angle.