Agosto 2024 vol. 11 num. 1 - XXXI Simpósio Internacional de Engenharia Automotiva

Trabalho completo - Open Access.

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Efeito de parâmetros de controle na recuperação de pressão de um sistema diesel common rail abastecido com etanol hidratado sob pressões ultra-altas

Effect of control parameters on pressure recovery in a common rail diesel system fueled with hydrous ethanol at ultra-high pressures

TODARO, R. H. ; ZABEU, C. Z. ; MALVEZZI, F. ;

Trabalho completo:

Atualmente, existem inúmeras iniciativas voltadas para a redução de emissões e gases de efeito estufa, com o objetivo de minimizar os efeitos do aquecimento global. Muitas dessas iniciativas estão associadas a tecnologias de propulsão veicular. Assim, a literatura sugere que o combustível das futuras frotas equipadas com MCI deveria ser um biocombustível atomizado sob ultra-alta pressão. Portanto, o uso de etanol em sistemas de injeção a diesel parece ser uma combinação promissora para atender às necessidades atuais. À luz do exposto, este estudo visa avaliar o comportamento dinâmico da pressão interna em um sistema common rail, considerando a operação com etanol hidratado e um arranjo contendo válvulas SCV e PCV controladas por PWM. Durante a operação do sistema a 500, 700 e 1000 bar de pressão média, observou-se que, sem energizar o injetor, o comportamento é regido pelas frequências características de atuação das válvulas. Ao simular eventos de injeção em uma bancada experimental, foram observados níveis de despressurização de até 30% do valor médio. Por fim, alerta-se que o sistema é suscetível a produzir plumas de combustível com variações macro e microestruturais significativas, o que poderia levar a uma incompatibilidade nos benefícios que o próprio sistema promete.

Trabalho completo:

Currently, there are numerous initiatives aimed at reducing emissions and greenhouse gases, with the goal of minimizing the effects of global warming. Many of these initiatives are associated with vehicular propulsion technologies. In this context, the literature suggests the fuel for future fleets equipped with ICE should be a biofuel atomized at ultra-high pressure. Therefore, the concurrent use of ethanol with diesel injection systems appears to be a promising combination to meet current needs. In light of the above, this study aims to evaluate the dynamic behavior of internal pressure in a common rail system, considering operation with hydrated ethanol and an arrangement containing SCV and PCV valves controlled by PWM. During the system operation with setpoints of 500, 700, and 1000 bar of average pressure, it was observed that, without energizing the injector, the behavior is governed by characteristic frequencies of valve actuation. When simulating injection events in an experimental test bench, depressurization levels of up to 30% of the average value were observed. Finally, it is cautioned the system is susceptible to producing fuel plumes with significant macro and microstructural variations, which could lead to a mismatch in the benefits that the system itself promises.

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DOI: 10.5151/simea2024-PAP105

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Como citar:

TODARO, R. H.; ZABEU, C. Z.; MALVEZZI, F.; "Efeito de parâmetros de controle na recuperação de pressão de um sistema diesel common rail abastecido com etanol hidratado sob pressões ultra-altas", p. 558-566 . In: Anais do XXXI Simpósio Internacional de Engenharia Automotiva . São Paulo: Blucher, 2024.
ISSN 2357-7592, DOI 10.5151/simea2024-PAP105

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