Patent ID: 7667564

Claim:
An ignition system for an internal combustion engine including an ignition coil having a primary winding and a secondary winding coupled to a spark plug in a combustion cylinder of the engine, a switch responsive to an ignition control signal for causing a primary current to flow through the primary winding, a control circuit configured to generate the ignition control signal so as to produce a plurality of sparks at the spark plug during a combustion event in the cylinder, characterized by: a case at least partially surrounding the primary winding, the case defining a substantially cylindrical outer surface and a longitudinal rib rising outwardly from the surface, the rib defining a channel, a segment of the primary winding extending through the channel from a first voltage location to a second voltage location wherein the first voltage location is a high voltage location and the second voltage location is a low voltage location, whereby a low voltage end of the primary winding is juxtaposed with a high voltage end of the primary winding owing to routing the segment through the channel of the rib; and at least one magnetic shield assembly at least partially surrounding the case, the shield assembly defining a slot, the rib being disposed substantially in the slot.