| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problems wherein, when an air-fuel mixture is ignited by reacting the plasma generated in a combustion chamber through a microwave by spark discharge with an ignition plug, since the microwave is reflected in a transmission line including a waveguide leading the microwave to the combustion chamber and the electric power of the microwave is varied by reflection of the microwave, it is difficult to correctly adjust the output of magnetron if the magnitude of the reflection is not grasped. Ž<P>SOLUTION: This high-frequency wave generator for a spark-ignition internal combustion engine electrically connected to the high-frequency wave supply part of the spark-ignition internal combustion engine igniting the air-fuel mixture by reacting the plasma generated in the combustion chamber through a high-frequency wave by the spark discharge with the ignition plug includes: a high-frequency wave generating source outputting the high-frequency wave for generating the plasma; a resistor connected in series to the high-frequency wave supply part between the high-frequency wave generating source and the high-frequency wave supply part; and a characteristic adjusting means estimating the heating state of the resistor by measuring the voltage at either end of the resistor and adjusting the characteristic of the high-frequency wave output by the high-frequency wave generating source based on the estimated heating state of the resistor. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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