乙醇汽油对发动机性能和排气噪声影响的试验研究

An Experimental Study on the Effects of Fueling Ethanol-Gasoline Blends on the Performance and Exhaust Noise of Engine

在电控汽油机参数未作任何调整,采用基于纯汽油标定的燃油控制策略的情况下,研究了某款车用汽油机燃用乙醇汽油（E10和E20）对发动机充气效率、动力性、经济性和排气噪声的影响。结果表明：燃用E20时充气系数增加2%~6%;而燃用E10时,在低转速时E10的充气系数基本不变,高转速时最大增幅2.1%;燃用E10的额定功率提升2.0%,而E20下降4.5%;E10和E20的当量燃油消耗率下降2%~7%;在1 200~2 000r/min,E10和E20的排气噪声下降显著,最大降幅达到11.2%,而2 500r/min以上时E10的排气噪声略有升高,E20基本不变。

Under the conditions of adopting the fuel control strategy based on pure gasoline with control parameters unchanged,the effects of fueling ethanol-gasoline blends（ E10 and E20） on the charging efficiency,power performance,fuel economy and exhaust noise of a vehicle engine are studied by tests. The results show that for the charging efficiency of engine fueled with E20 increases by 2% ~ 6%,but with E10,there is little change at low speeds and increases by 2. 1% at most at high speeds. The rated power of engine fueled with E10 rises by 2. 0%,but falls by 4. 5% with E20. The equivalent specific fuel consumption of engine fueled with E10 or E20 declines by2% ~ 7%. The exhaust noise of engine fueled with E10 or E20 lowers significantly in a speed range of 1 200 ~2 000 r / min,by 11. 2% at most,and it slightly rises with E10 and basically unchanged with E20 when speed higher than 2500 r / min.