| Summary: | 碩士 === 南開科技大學 === 車輛與機電產業研究所 === 100 === Motorcycles occupy a high rate of percentage among domestic short-range transportation vehicles due to a high mobility, its pollutant concentrations is higher than automobiles though. Therefore, for effectively enhancing engine performance of motorcycles and reducing the concentrations from emissions, this research explores the impact on the engine output torque and emission concentration by changing the engine combustion chamber volume to increase engine compression ratio. The research determines the domestically produced 150 c.c. four-stroke jet engine as an experimental engine, analy sizes different proportions of ethanol blended gasoline fuels (E30 and E60) at full load, engine speed (N=4,000~6,000), relative air-fuel ratio (λ=0.8, 1.0 and 1.2) as operating conditions. The experimental result additionally makes comparison with unleaded gasoline (E0). The result indicates that highly-improved compression ratio show no validity on engine output torque but significant effect on BSFC on condition that the ignition timing is unchanged. Moreover, ethanol blended gasoline fuels efficiently reduce the concentration of CO emissions. Relatively, the high rising combustion temperature increases the NO emission concentrations, and then significantly rises up the concentration of CO2 emissions.
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