| 摘要 |
PURPOSE:To control the combustion state of an engine with high precision through such simple constitution that only a microwave circuit and a photoelectric converting circuit are added to an ignition plug. CONSTITUTION:The ignition plug 4 has a coaxial circuit structure which propagates a microwave signal, and th tip part of the center conductor has a high- frequency antenna function. Further, an optical fiber for guiding light out of a combustion chamber is incorporated in the center and a piezoelectric element as a knock sensor is provided. Microwave resonance before and after of a top dead point of a piston is measured by the antenna function and led to a top dead point detecting circuit 17, and a light signal originating from a combustion flame is guided out through the optical fiber and converted into an electric signal, which is led to a combustion flame color detecting circuit 19. Further, the piezoelectric element detects a knocking signal, which is led to a knocking detecting circuit 18. Thus, the amount of fuel injection, timeing, air suction amount, etc., are controlled collectively by said detection. |
