| 摘要 |
PURPOSE: An in-cylinder injection type engine is provided to achieve an improved prevention against an excessive thickening of air-fuel mixture around an ignition plug and expansion of stratified combustion area, thus resulting in an improved fuel efficiency. CONSTITUTION: An in-cylinder injection type engine comprises a concave cavity(20) formed at an upper surface of a piston, an injector(11) for injecting a fuel into a combustion chamber, and an ignition plug(12) arranged in the vicinity of the cavity to face the injector as viewed in a plane, the engine injecting a fuel from the injector(11) toward the cavity(20) so as to cause a biased arrangement of an air-fuel mixture, the engine further comprising a swirl generating unit for generating swirl in the combustion chamber, wherein fuel injection direction, fuel permeability, and swirl ratio are set in such a manner that a fuel spray from the injector(11) is arranged to direct toward the ignition plug(12) when a pressure in the cylinder is low and escape from the plug(12) by the swirl as the pressure in the cylinder increases.
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