Patent ID: 6539930
Filing Date: 2003-04-01
Classification: F02P

Abstract:
An ignition apparatus for an internal combustion engine comprises:an ignition coil comprising a primary winding and a secondary winding, wherein the secondary winding has high voltage side and a low voltage side, and the ignition coil generates a firing voltage supplied to the secondary winding by cutting off a primary current flowing in the primary winding; a switching device for conducting and cutting off the primary current; a spark plug connected in series to the secondary winding to form a closing loop, wherein a spark discharge is generated in the spark plug when a secondary current generated by the firing voltage flows in the spark plug; a diode for preventing a reverse current, connected to a conducting path between the spark plug and the high voltage side; a current detecting device connected in series to the secondary winding in the spark plug; a supplied voltage limiting device holding a voltage applied to the current detecting device below a predetermined value when the firing voltage is generated.