| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of avoiding worsening in the noise and vibration resulting from simultaneous compressed self-ignition of mixture gas at a time. Ž<P>SOLUTION: A first light fuel having a low self-ignitability, for example gasoline, and a second heavy fuel having a high self-ignitability, for example light oil, are mixed in advance and injected from a fuel injection valve 9 toward the center of a piston 2 bowl 2a. From atomized drops of the mixture fuel, the first light fuel component gasifies precedingly and the second heavy fuel component reaches far so that a mixture gas f1 having a low self-ignitability is formed in the central part of the bowl 2a while a mixture gas f2 having a high self-ignitability is formed at the perimeter of the bowl 2a. Accordingly when self-ignition takes place owing to compression with a rise of the piston 2, the mixture gas at the perimeter having a high self-ignitability makes first the ignition and combustion, followed by the mixture gas in the central part having low self-ignitability. This allows avoiding a steep rise of the pressure, and it is possible to accomplish a high-efficiency, low emission combustion with a sufficiently low noise and vibration. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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