Experimental and vehicle (on road) test investigations of spark-ignited engine performance and emissions using high concentration of MTBE as oxygenated additive

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• 作者：I. Schifter ; ^{ishifter@imp.mx" class="auth_mail" title="E-mail the corresponding author} ; U. Gonzá ; lez ; L. Dí ; az ; C. Gonzá ; lez-Mací ; as ; I. Mejí ; a-Centeno
• 关键词：High concentration of MTBE ; Regular gasoline ; Single cylinder engine ; FTP-74 tests
• 刊名：Fuel
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：187
• 期：Complete
• 页码：276-284
• 全文大小：1404 K

文摘

We study the effect of increasing methyl-tert butyl ether in regular gasoline (15, 25 and 51% volume) on the performance and combustion characteristics of spark ignited engines. A single cylinder engine, spark ignited was used. The engine in fully instrumented in order to measure all the relevant parameters, i.e. temperatures, pressures, exhaust emissions, intake air and fuel flows and indicating parameters like mass burned fuel. Results were compared with those obtained with a fleet of five model year 2003–2010 passenger cars. For that purpose FTP-74 tests were performed for the fuel containing 25% MTBE and compared with those obtained with the regular commercial gasoline. The gasoline-MTBE at 25% blend presents the lowest dispersion among the tested fuels, and the evolution of the instantaneous pressure with respect to the crank angle for each fuel, pointed out that no misfires occurred. The fuel with high contents MTBE (Blends 2 and 3) burn slightly later than the fuels formulated with typical MTBE contents around 11% volume. On the average, fuel economy seems to decrease as MTBE increases in accordance with the results observed using the single cylinder engine. Our results shows no immediately adverse effects when the MTBE contents increases up to 51%, and a small reductions in NOx as the MTBE contents increases. The octane requirement of the tested vehicles may be controlled by the knock sensors that adjust the engine operating. Clearly the use of high contents of ethers (i.e. between 25 and 30% MTBE in volume) as a fuel constituent represents an alternative for fuel decarbonization in Mexico and can be an alternative way to reduce the use of fossil fuels.