| Summary: | 碩士 === 國立彰化師範大學 === 車輛科技研究所 === 96 === Abstract
In Taiwan, the increasing cost of liquid fuels derived from crude oil and growing concern about environmental pollution have increased interest in alternative engine fuels for the past few years. In this thesis, the effect of oxygen containing additives on gasoline blended fuels and LPG fuel on exhaust emissions were investigated for different engine speeds in a single cylinder, four stroke, spark ignition engine. The results indicate that CO and HC exhaust emissions are lower with the use of ethanol-gasoline and DMC-gasoline blended fuels as compared to the use of unleaded gasoline. On the other hand, the effect of ethanol-gasoline and DMC-gasoline blended fuels on NOX exhaust emission is insignificant. Using oxygen containing additives can increase fuel consumption as a result of the heating value of the blended fuels being lower than that of unleaded gasoline.
In this thesis, the open-loop of LPG injection system was controlled by MCS-51 single chip. Comparisons show that if LPG fuel SI engine is operated at the same conditions with those of gasoline fuel SI engine, significant improvements in exhaust emissions can be achieved. In summary, LPG has positive effects on main of exhaust emissions such as CO, CO2 and NOX.
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