경승용차용 5밸브(흡기3밸브) 가솔린 엔진의 연소실 형상 설계 기술에 관한 연구

Abstract

For the development of high efficiency gasoline engine, the optimization of the 5-valve(intake 3valve) combustion chamber for a subcompact vehicle has been studied. Intake multi-valve cylinder heads were manufactured by using a 3-dimension CAD program, and steady state flow experiments have been performed with these cylinder heads. The 5-valve engines, which have larger valve opening areas, have larger intake flow rates and higher flow coefficient than the 4-valve engines. The effects of intake port design parameters of a 5-valve engine on the intake flow rate and bore size were studied, and the design guidelines for the 5-valve engine were established.