직접분사식 LPG 엔진의 연소전략 및 공기과잉률 변화에 따른 연소특성 비교

Abstract

Liquefied Petroleum Gas(LPG) has attracted attention as a alternative fuel. The lean-burn LPG direct injectionengine is a promising technology because it has an advantage of lower harmful emissions. This study aims to investigatethe effect of combustion strategy and excess air ratio on combustion and emission characteristics in lean-burn LPGdirect injection engine. Fuel consumption and combustion stability were measured with change of the ignition timingand injection timing at various air/fuel ratio conditions. The lean combustion characteristics were evaluated as a functionof the excess air ratio with the single injection and multiple injection strategy. Furthermore, the feasibility of leanoperation with stratified mixture was assessed when comparing the combustion and emission characteristics withpremixed lean combustion.