| 摘要 |
PURPOSE:To make stable high-speed and high-power come to fruition, by installing a main fuel injection device, which sprays main fuel to the air-fuel mixture premixed with auxiliary fuel at a suction manifold part when an engine speed goes up beyond the acritical one. CONSTITUTION:In the case where the engine speed detected by an engine speed detector 4 is more than the critical one, auxiliary fuel is sprayed out of an auxiliary fuel injection device 7 by a combustion control unit 5. In time of a suction process, this auxiliary fuel is premixed at a suction manifold part 17 whereby it turns to high temperature and high pressure mixed gas. Making it timing advance in this mixed gas, when main fuel is sprayed out of a main fuel injection device 6, this main fuel turns to minute oil drops and spreads over whereby it ignites at every part of the mixed gas at a top dead point. Thus, since the mixed gas comes to a succicient combustion velocity for high speed revolution, stable high-speed and high-power is realizable.
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