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High Efficiency Flex-Fuel Engines and the End of the 70% Paradigm
Technical Paper
2017-36-0162
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Recently many government Acts (Inova Energia, Inovar-Auto, RenovaBio) [1, 2, 3] have been implemented in order to expand the use of biofuels in Brazil. Besides the fulfillment until 2030 of the commitment assumed at the COP21[4] to reduce in 43% the gas emission contributing to the greenhouse effect, the expansion of the use of biofuels is important to assure regularity in the supply of fuels to the automotive sector in the next 15 years.
In this context, it is worth mentioning a special characteristic of the Flex-Fuel engines that equip the majority of the automobiles in Brazil since their launching in 2003. The maximum compression ratio of these engines depends on the knocking characteristics of the gasoline, but usually an intermediate value, nearer to the ideal value for gasoline, is a compromise. In any case, the energy conversion efficiency of the engines is not optimal, especially for ethanol, since the lower compression ratio required by the gasoline does not allow the full benefits of ethanol´s anti-knocking properties at higher compression ratio [5].
Aiming to reduce the fuel consumption of Flex-Fuel engines, the influence of the volumetric compression ratio on the fuel conversion efficiency of a single cylinder research engine was investigated. In this article the experimental results of engine tests using E22 and E100, with PFI and DI injection systems, varying the compression ratio from 11.5 to 15:1, and optimizing the flow structure (tumble and swirl) for different internal EGR, will be reported. The experimental results showed good correlation with the numerical simulation, which is part of this research and presented on another article.
Both the numerical simulation and the experimental tests confirmed the theory that higher compression ratios will result in better fuel consumption ratio between ethanol and gasoline, with advantages for the biofuel due to its anti-knocking properties. It also became clear that high compression ratios, associated to internal EGR and optimized flow structures, allow relevant fuel consumption reductions, especially of ethanol at medium and high loads.
Authors
- Paulo César de Ferreira Gomes - Robert Bosch Ltda.
- Carlos Fernando Mendes - Robert Bosch Ltda.
- Gustavo Santos Lopes - Robert Bosch Ltda.
- Erwin Karl Franieck - Robert Bosch Ltda.
- Alysson Fernandes Teixeira - Centro de Tecnologia da Mobilidade - UFMG
- José Guilherme Coelho Baeta - Centro de Tecnologia da Mobilidade - UFMG
- Nilton Antônio Diniz Netto - Centro de Tecnologia da Mobilidade - UFMG
Citation
de Ferreira Gomes, P., Mendes, C., Lopes, G., Franieck, E. et al., "High Efficiency Flex-Fuel Engines and the End of the 70% Paradigm," SAE Technical Paper 2017-36-0162, 2017, https://doi.org/10.4271/2017-36-0162.Data Sets - Support Documents
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References
- Financiadora de Estudos e Projetos INOVA ENERGIA http://www.finep.gov.br/apoio-e-financiamento-externa/programas-e-linhas/programas-inova/inova-energia April 2017
- Ministério da Indústria, Comércio Exterior e Serviços Inovar Auto http://inovarauto.mdic.gov.br/InovarAuto/public/login.jspx?_adf.ctrl-state=1amwcaa8en_19 April 2017
- Portal Brasil RenovaBio vai expandir produção de biocombustível no País http://www.brasil.gov.br/infraestrutura/2017/02/renovabio-vai-expandir-producao-de-biocombustivel-no-pais April 2017
- Nova Cana RenovaBio - Diretrizes Estratégicas - Proposta Submetida à Consulta Pública https://www.novacana.com/pdf/22032017150320_14_Deloitte.pdf April 2017
- Financiadora de Estudos e Projetos Relatório de Acompanhamento Técnico de Projetos Ref. FINEP 0391/14, pag. 4, número de contrato: 03.15.0036.00 December 2016
- União da Indústria de Cana de Açúcar Etanol - 60 países já adotam mistura obrigatória de biocombustíveis aos combustíveis fósseis http://www.unica.com.br/noticia/27251092920325965467/60-paises-ja-adotam-mistura-obrigatoria-de-biocombustiveis-aos-combustiveis-fosseis/ April 2017
- Caseiro , C. Production and Consumption of Biofuels in the World Today: Key Issues to Analyze its sustainability Revista de Geografia Agrária 6 12 6 31 August 2011
- BCSD Biocombustíveis BCSD Portugal 6 2008
- Nigro , F.E.B. Eficiência de Veículos com Etanol presented at AEA - Simpósio de Eficiência Energética: Emissões e Combustíveis Brazil, São Paulo May 21, 2015
- Gomes , P. et al. Study on Boosted Direct Injection SI Combustion with Ethanol Blends and the Influence on the Ignition System SAE Technical Paper 2011-36-0196 2011 10.4271/2011-36-0196
- Hollanda , J. B. de Paridade 70: falso conceito a ser desconstruído presented at III Seminário Internacional sobre Uso Eficiente do Etanol Brazil, Campinas September 21, 2016