Patent ID: 9407070
Filing Date: 2016-08-02
CPC Classification: F02P,H01T

Claim Text:
1. An ignition system configured to generate a spark discharge by applying a voltage to a gap formed by a center electrode and a ground electrode, the ignition system comprising: an auxiliary electrode being disposed separately from the center electrode, the auxiliary electrode to which is applied a voltage having a reverse polarity to the center electrode, wherein a voltage that is equal to or lower than the voltage applied between the center electrode and the ground electrode and that generates no spark discharge is applied to the auxiliary electrode, wherein the auxiliary electrode is positioned in such a manner that an electric field generated by the applied voltage between the auxiliary electrode and the ground electrode or between the auxiliary electrode and the center electrode is spread over the gap, wherein a period of time for applying the voltage to the auxiliary electrode is controlled so as to include a period of time for applying the voltage between the center electrode and the ground electrode, wherein the auxiliary electrode is disposed in a position where a distance from the center electrode is longer than a distance of the gap between the ground electrode and the center electrode, and wherein the voltage applied to the center electrode is applied between the center electrode and the ground electrode, and between the center electrode and the auxiliary electrode.