| Summary: | 碩士 === 南開科技大學 === 車輛與機電產業研究所 === 102 === Serious environmental pollution and exhaustion of fossil fuels caused by excessive use of fossil fuels will have a direct impact on vehicles powered by fossil fuels. Adding certain percentage of ethanol to gasoline has the benefit of reducing environmental pollution, decentralizing the use of fossil energy and improving the octane of fuel to reduce knock. In addition, basic amount of fuel injection is based on an intake air volume. A bad intake system has severely resulted in engine performance shortage and environmental pollution. This study experimentally adopts different inlet net cross-sectional areas (AIntake = 70%, 40%, 20%, 15%, 10%) to go with different various ethanol mixed with gasoline fuel (E40, E60, E80) in motorcycle speed (V = 40, 50, 60, 70, 80 km / hr) for exploring motorcycle performance and exhaust gas impact. The experimental results compares with that operated with 95 unleaded gasoline and 100% inlet cross-sectional area. The results showed that the use of E40 fuel enhanced efficiently a positive vote on the torque. Because the latent heat of vaporization of ethanol is higher, intake air temperature can be reduced to improve the volumetric efficiency. Mixed fuel has a significant effect on emissions of CO and HC. Emission was reduced significantly by increasing ethanol. With 100% inlet net cross-sectional areas, the use of E40 ~ E80 fuel is decreased to 71%, 99% and 100% compared to E0 fuel. Secondly, The impact of reducing inlet net cross-sectional area on output performance motorcycle showed a pattern that the output torque decreased as inlet net cross-sectional area increased. This pattern remained stable in AIntake> 40%. This results show that impact engine output torque is not significant when the inlet net cross-sectional blocking area was 60% by external environmental factors. For the aspects of gas exhaust, the CO and HC emissions was reduced in AIntake = 10% because oxygen sensor correction makes a complete combustion to reduce emissions. Emissions increased in 15% and 20% separately due to rich combustion lacking air volume rendering. A complete combustion resulted in reducing emissions in 40%, 70% and 100%. The effect is not obvious to emissions of CO2.
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