| 摘要 |
This invention to achieve efficient combustion of volatile fuels through the precise control of the opening/closing of a control valve installed in the path between the main and the subcombustion chambers installed to vaporize and ignite volatile fuels for combustion at high-compression ratios. The control valve 5 is installed in the path 31 between the main combustion chamber 23 and the subcombustion chamber 3. The subcombustion chamber 3 with a heat-insulating structure, is equipped with the injection nozzle 6 and the spark plug 7. The controller 8 judges the load applied to the engine by verifying the signals which are input from the revolution sensor 81, the load sensor 82 and the crankshaft position sensor 83. If the load is applied to part of the engine, the control valve 5, which was opened at the initial stage of the expansion stroke, is closed at the final stage of expansion so that hot gases remain in the subcombustion chamber. If the load is applied to the entire engine, the control valve 5 is closed in the exhaust stroke to leave the gases with high exhaust pressure so that the fuel to be injected in the next cycle is vaporized and activated.
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