| 摘要 |
PURPOSE:To constantly and effectively vaporize an alcohol fuel in all the operating regions of an engine and to improve the combustion efficiency by disposing a red heat member in an internal wall portion of a combustion chamber, and controlling the red heat member so as to put to a heated or non-heated state in accordance with the operating state of the engine. CONSTITUTION:A sub-combustion chamber 5 in which an exhaust valve 1 and an alcohol fuel injection nozzle 15 are respectively disposed has upper and lower internal wall portions 26, 29 made of material of low thermal conductivity. A red heat plate 12 is provided between the upper and lower internal wall portions 26, 29 and an outer periphery thereof is thermally insulated from a cylinder head 3 through a heat insulating gasket 14. Then, the driving of the fuel injection pump 11 of the fuel injection nozzle 15 and the red heat plate 12 is controlled by a controller 10 based on respective detecting signals from an engine load sensor 16 and a rotation sensor 17. Namely, for example, when an engine speed is lower than a prescribed value, it is judged that the red heat member is put to a low temperature state and the red heat plate 12 is heated to promote the vaporization of alcohol fuel.
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