Performance and emissions at different running condition of spark ignition engine fueled with ethanol-gasoline blends

摘要

In this study, the effects of ethanol-unleaded gasoline blends and partially wide opening throttle (WOT) on engine performance and exhaust emissions were experimentally investigated. The experiments were performed by varying ethanol-unleaded gasoline blends as unleaded gasoline (E0), 15% ethanol + 85% unleaded gasoline (E15), 35% ethanol + 65% unleaded gasoline (E35) and 45% ethanol + 55% unleaded gasoline (E45). In experiments, firstly the effects of ethanol-unleaded gasoline blends on engine performance and exhaust emissions at full throttle position values were clarified. Secondly, tests were carried out with half and quarter throttle positions. The results indicated that the different throttle positions and ethanol content play an important role to reduce carbon monoxide (CO), unburned hydrocarbon (HC) emissions. Results also showed that the engine power was slightly decreased and brake specific fuel consumption increased.