| 摘要 |
PURPOSE:To atomize and disperse injection fuel so as to prevent generation of smoke at the time of uniform combustion by dividing and injecting a fuel injection amount necessary at the time of low rotation by plural times, when fuel injection is started during intake stroke in an engine operating condition in which the uniform combustion is carried out. CONSTITUTION:A intake passage 1 is communicated with a base cylinder inside through an intake valve 2, and also an exhaust passage 3 is communicated therewith through an exhaust valve 4. An ignition plug 5 is arranged on the center of a cylinder upper part. A fuel injection valve 6 for injecting fuel into a cylinder is arranged between a plurality of intake valves 2. On the other hand, a recessed combustion chamber 7a is formed on the top surface of a piston 7. The fuel injection valve 6, starts fuel injection operation during intake stroke in such an engine operating condition that uniform combustion is carried out. In this case, necessary fuel injection amount is divided and injected by plural times, at least in engine operating condition of low rotation.
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