가스 연료 엔진의 연소 조건에 따른 배기 밸브 온도 비교

In order to meet global requirement in terms of fossil fuel capacity and carbon dioxide reduction alternative fuels such as ethanol, methanol, LPG, and CNG have been widely applied to automotive internal combustion engines. In general, it is well known that the engine originally based on gasoline fuel should be modified with hardened materials especially for valves and valve seats to cope with these alternative fuels. This is because alternative fuels can cause valve burning and seat wear due mainly to different combustion characteristics and thermal management is one of key control parameters for engine development. This study has been performed to find a way to optimize engine calibration in addition to right selection of hardened materials for gaseous fuel application such as LPG and CNG. A correlation between valve temperature, exhaust gas temperature and valve system wear has been experimentally analyzed and reported.