抄録
Ethanol-enriched gasoline plays an important role in reducing fossil fuel by enabling the increase of thermal efficiency in gasoline engine. The object of this study is to experimentally evaluate a performance and exhaust emissions Of a single-cylinder, four stroke, naturally aspirated type gasohne engine with hot EGR for NOx control operating on ethanol mixing gasoline (E0-E50). The combustion characteristics such as specific fuel consumption, thermal efficiency, exhaust temperature and emissions of NOx, CO, HC, CO_2, HCHO are compared with those of JIS K2202 #2 regular gasoline. Experimental results are as follows, (1) NOx concentrations and exhaust gas temperature increase with increase of ethanol ratio in gasoline/ethanol engine, (2) EGR enables to reduce the NOx concentrations significantly and the emissions Of CO , HC for E25, E50 are lower than the case of regular gasoline. The use of hot EGR has positive effects on improvement of fuel evaporation.
