Emissões de poluentes durante a fase de aquecimento em um motor Flex utilizando gasolina e etanol

Abstract

Due to the decrease of oil reserves and the crescent preoccupation with the global warming, more and more countries turned their attention to the bioenergy. Ethanol, at times has been used alone or with blends with gasoline with the objective to reduce the emissions of pollutants generated in SI engines. In literature, it is possible to find many studies about the applications of Ethanol-Gasoline blends in different proportions in SI engines, analyzing the performance and the emission. However, all of these studies focused in analyzing these effects in warmed and steady engines. During the ignition of the Otto cycle engine, a rich amount of fuel is injected to ensure the ignition. In the start, the engine is at a low temperature, and this extra supply of fuel produce a lot of Hydrocarbons and Carbon Monoxide emissions. On behalf of the lack in results about warm-phase emissions, and even less works using a Flex engine, this work has the purpose of complete this lack.