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[[abstract]]本研究主要探討酒精汽油在不同節氣門開度與引擎轉速下，對引擎性能、燃燒特性與污染排放之影響，並與市售95無鉛汽油做比較。酒精汽油為不同比例之乙醇與95標準無鉛汽油混合燃料。試驗油料為E0：未添加任何添加劑之95標準無鉛汽油，E3：97% E0+3%乙醇，E5：95% E0+5%乙醇，E10：90% E0+10%乙醇，E15：85% E0+15%乙醇，E20：80% E0+20%乙醇。 由實驗結果可知：由於乙醇可增加燃料之辛烷值與減少熱值，因此增加乙醇混合汽油的燃料其最大汽缸壓力、引擎馬力會減少。引擎高轉速時，混合乙醇之燃料會增加總熱釋放量。E3雖然有減少引擎馬力，但在乙醇混合燃料中最接近95無鉛汽油。當汽油混合酒精燃料時，制動燃油消耗率在大部分的情況下會上升。增加乙醇燃料混合比例，會減少CO與HC污染排放。, [[abstract]]The effect of ethanol-gasoline blended fuels different ration of ethanol-gasoline blended fuels under different opened throttle and engine speed on engine performances, combustion characteristics and emissions were studied. The test results were compared with the performances of commercial 95 unleaded gasoline. Ethanol-gasoline blended fuels were E0: 95 unleaded standard gasoline, E3:97% E0+3% ethanol, E5:95% E0+5% ethanol, E10:90% E0+10% ethanol, E15:85% E0 +15% ethanol and E20:80% E0+20% ethanol. The experimental results showed as follows: Ethanol could increase fuel octane number and decrease heating value. The maximum cylinder pressure and engine horsepower were decreased with increasing ethanol blends. When blended with gasoline, gross heat release rate is increased during engine high speed. The combustion characteristic of E3 is closed with 95-unleaded gasoline. Brake specific consumption rate is increased when gasoline blended ethanol. The exhaust emission of CO and HC were reduced with increasing blending rate of ethanol.