Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Ethanol charge stratification in supercharged spark-ignition low-displacement engines: An approach to energy efficiency
Submission Author:
Tulio Oliveira , DF
Co-Authors:
Tulio Oliveira, Fábio Lisboa, Yago Levi Acypreste Benazio, Gabriella Reinert Tosta , RAUL FERNANDO SANCHEZ AGUILAR
Presenter: Fábio Lisboa
doi://10.26678/ABCM.COBEM2023.COB2023-0743
Abstract
Due to the challenges encountered by the automotive industry in developing solutions to reduce carbon emissions and harmful gases, engines that consume fuels from renewable sources are a good alternative. In this context, applying technologies that increase the energy efficiency of engines and still contribute to the reduction of emissions is strongly desirable, to the point of being a research line of the route 2030 program of the federal government in Brazil. The present work presents results obtained in research within this thematic line, using as a base a supercharged low-displacement engine, with direct injection of ethanol in homogeneous and stratified charges. A brief review of the state of the art that guides the research will be presented, followed by all the methodology and equipment used to obtain the results. For the study, engines present in the Brazilian market are used, which use the technologies studied, always powered by ethanol as fuel. The engines used are the EA211 MPI and the EA211 TSI, equipped with Bosh programmable engine control centers (ECU), which will be used for experimental validation of simulated data in computational tools such as ETAS ASCET for the production of codes and ETAS INCA used for ECU development, testing, validation and calibration. The simulation of the overall operation of the engine is carried out by the AVL Boost and AVL Fire software, where flow, combustion and performance conditions are simulated. As a result, control strategies and operation maps are presented for different conditions, varying parameters such as lambda, fuel pressure, compressor pressure, EGR adjustment and fuel composition. In addition to performance and energy efficiency studies, NOx emissions will be estimated using the Zeldovich mechanism and other combustion substances by chemical kinetics. For validation of the results, measurements of emissions using a NAPRO automotive gas analyzer will be used. At the end, it is intended to indicate limitations and propose engineering solutions for increasing energy efficiency in low-displacement engines, associated with the adequacy of emissions to current legislation.
Keywords
stratified ethanol injection, combustion engines, engine control strategy
