Patent ID: 7353813

Claim:
An ignition coil for use in the spark ignition engine comprising one spark plug and a plurality of ignition coils per cylinder assembled into a single unit and performing a plurality of ignitions during a compression stroke of each cylinder, wherein main ignition is performed at main ignition timing decided depending on the operating conditions of said engine, at least one preliminary pre-ignition is performed before the main ignition on of said ignition coils outputs energy for the main ignition and another of said ignition coils energy for the preliminary pre-ignition, wherein one of said plurality of ignition coils is constituted as a cylindrical ignition coil inserted in a plug hole, and another is constituted as a horizontally oriented ignition coil mounted on said cylindrical ignition coil and has a second center core arranged in a direction to cross a first center core of said cylindrical ignition coil.