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김진영(Jin-young Kim),박원옥(Won-ok Park),공태원(Tea-won Kong),이중순(Joong-sun Lee),하종률(Jong-yul Ha) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
Natural gas is considered to be an alternative fuel for passenger car and truck transportation that can provide both good environmental effect and energy security.<br/> In the present study, a 1.8L conventional gasoline engine was modified to a CNG engine with PFI system., which can be operated with CNG only as a fuel. The effects of flow motion, air fuel ratio and ignition timing on the combustion and emission performances were investigated. Flow motion of tumble-swirl were varied with a swirl control valve installed at the inlet ports. We analyzed the combustion characteristics of engine by analysis of the cylinder pressure.<br/> As a result, CNG engine with swirl control valve increased brake torque, but higher exhaust emissions, compared to the prototype CNG engine<br/>