| 摘要 |
A plasma ignition system (1) includes an ignition plug (10) attached to an engine and a high-voltage supply (20, 30). The plug includes a center electrode (110) serving as a positive pole, a ground electrode (130) serving as a negative pole, and an insulating member (120) insulating the center electrode from the ground electrode and defining a discharge space (140) therein. At least a part of a surface of the center electrode faces the space, and at least a part of a surface of the ground electrode faces the discharge space. The plug puts gas in the space into a plasma state and injects the gas into the engine as a result of application of high voltage and supply of a large current to the plug by the high-voltage supply. The center electrode has a recess portion (111) opposed to the space and recessed in a direction opposite to an injection direction. |
