| Summary: | 碩士 === 國立彰化師範大學 === 車輛科技研究所 === 102 === The study is the way of experiment, which investigates n-butanol-gasoline blends for engine performance, fuel consumption and pollutant emissions in the four-cylinder spark ignition engine. Experiment is divided into two parts. The first part is the use of pure gasoline and n-butanol-gasoline blends (B10, B20, B30, B40). The second part is the use of higher proportion of n-butanol-gasoline blended fuels (B50, B60) and pure gasoline under various ignition timing, investigating the ignition timing and higher proportion of blended fuels for engine performance, fuel consumption and pollutant emissions in the four-cylinder spark ignition engine .
Experimental results showed that use of n-butanol-gasoline blended fuels, the engine tends to lean air-fuel ratio and the torque output increases compared with pure gasoline. The BSFC was slightly increased at low speed, but engine at high speed, the BSFC is decreased. The CO and HC emissions can be effectively reduced, but CO2 emissions increase and that NOX emission depends on the engine operating condition. On the other hand, advancing the ignition timing which can increase the engine torque and obtain better BSFC; Retarding the ignition timing which can reduce exhaust emissions of HC and NOX. However, the experimental results showed that the CO and CO2 was mainly influenced by λ value.
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