| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem on a spark ignition type internal combustion engine that the reaction of an electric field with spark discharge generates plasma to possibly improve igniting efficiency that, when using microwaves to generate the electric field, the use of a monopole type antenna as an antenna for radiating microwaves to simplify construction generates all-round directivity, and therefore, electromagnetic waves are radiated to areas other than the vicinity of an ignition plug to form the electric field, and plasma may be generated in an area other than the vicinity of the ignition plug, thus resulting in instable combustion generated by the plasma generated in an unexpected position. SOLUTION: In the spark ignition type internal combustion engine, the reaction of an electric field generated in a combustion chamber by electromagnetic waves with spark discharge caused by the ignition plug 1 generates plasma to ignite a mixture. An inner diameter D of the combustion chamber 6 is set to be not larger than 1/2 of the wavelengths of the electromagnetic waves. COPYRIGHT: (C)2011,JPO&INPIT
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