| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of continuously and stably implementing desired discharge for spark ignition. ! SOLUTION: In a spark ignition type internal combustion engine in which plasma is produced in a combustion chamber by mutual action of electric field produced in the combustion chamber through an antenna facing the inside of the combustion chamber of a cylinder, and spark discharge generated between a central electrode of an ignition plug and an earth electrode to ignite an air-fuel mixture, an application device 13 is disposed for switchably applying voltage for making electric potential of the central electrode positive or negative in comparison with electric potential of the earth electrode, from an ignition coil 14 for spark discharge, and the application device generates spark discharge by applying the positive electrode to the central electrode when the intensity of electric field supplied to the combustion chamber is a prescribed value or more, and app |
