本文以單缸直噴式柴油引擎搭配田口實驗方法找出生質柴油、液化石油氣與廢氣再循環的最佳化濃度搭配。文中三種不同的操作因子將各取三種不同濃度，生質柴油將使用B10、B20、B30三種比例，液化石油氣使用20%、30%、40%三種能量分配比，廢氣再循環使用進氣量的20%、30%、40%三種濃度，在引擎不同運轉負荷情況下，以田口直交表及因子組合進行實驗，量測引擎運轉時產生的廢氣排放濃度及性能表現，並分析各因子的影響程度，找出最佳化的因子操作組合，再與原始柴油機進行比較，探討其排氣汙染、制動耗油率、缸內壓力上升率以及著火延遲等效應。
使用田口實驗方法可大幅減少實驗次數，並藉由ANOVA分析了解各因子對排氣汙染濃度以及耗油率的影響程度。結果顯示各因子對於品質目標的影響程度會隨著運轉負荷的改變而變化，運轉負荷越高，生質柴油的濃度對於NOX的排放影響越顯著；使缸內溫度的上升而有助於LPG的燃燒，因此LPG燃燒越好則有越高的熱釋放率。EGR濃度越高，進入缸內的新鮮空氣量就越少，對於缸內燃料燃燒情況越差，使峰值壓力下降，且延長著火遲延角，熱釋放率趨勢也延後。

This study uses the Taguchi method to find out the best concentrations for biodiesel, LPG, and EGR in a single DI diesel engine. Biodiesels of B10, B20, and B30, LPG energy distribution ratios of 20%, 30%, and 40%, and EGR concentrations of 20%, 30%, and 40% are chosen as three control factors. For various engine loads using orgonal array and factor group in the Taguchi conducts the experiment and measures the exhaust emissions and operating performance. Determining the optimal operating factors and comparing this with original diesel engine investigates the effects of exhaust emissions, BSFC, cylinder pressure derivative, and ignition delay, and so on.
Experimental results show that the impact level of each factor for quality goals changes with varying the engine load. With increasing engine load, the impact of biodiesel concentration on NOX emissions becomes more significant. The cylinder temperature increase would help the LPG burn stably and more completely to have higher rates of heat release. When EGR concentration increases, the amount of fresh air into cylinder would decrease to obtain worse combustion, decrease the peak cylinder pressure, extend ignition delay, and delay heat release.

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