| 摘要 |
PROBLEM TO BE SOLVED: To provide an ignition device, performing volume ignition utilizing unbalanced plasma, which performs stable ignition effectively utilizing energy while suppressing preignition.SOLUTION: The frequency of an applied AC voltage is set to be 80-620 kHz and the capacity Vof a discharge space 130 is set to be 300 mmor less, or the discharge space length Lis set to be 1-10 mm, Further, the length Lof a center electrode tip part 100 covered with a center dielectric 11 is set to be longer than the discharge space length L, and the distance D2 from a tip of a center dielectric bottom part 110 to a top face of a piston 52 of an internal combustion engine is set to be longer than a discharge gap D1. |
