Influence of the Valve-lift Strategy in a CAI™ Engine using Exhaust Gas Re-Breathing - Part 1: Experimental Results and 0D Analysis

Duffour, Florence; Vangraefschèpe, Franck; Knop, Vincent; Francqueville, Loïc de

doi:10.4271/2009-01-0299

Cited by 10 publications

(11 citation statements)

References 11 publications

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“…The variety of available sub-models, which are representative of the most relevant engine components, allowed for an uncomplicated, accurate description of the CAI engine. 10,41,47 We checked the tool's validity by comparing experimental and numerical quantities, such as instantaneous pressure traces in the intake port, in the exhaust port, and in the combustion chamber, as well as cycleaveraged flow rates, intake and exhaust gas temperatures and fuel/air equivalence ratios (FAERs). We were able to build confidence for the extracted additional non-measurable data (mainly in-cylinder temperature and mixture composition) by carefully checking that the physical phenomena we observed on the dynometer were accurately reproduced.…”

Section: System Simulationmentioning

confidence: 99%

“…Previous studies have already described this engine and its variable valve actuation device in detail. 12,41,47 Control over the amount of burnt gases is a key for successful implementation of CAI combustion in an engine. Two valve lift strategies are possible: NVO 4,7,41,53,54 and EGRB.…”

Section: Engine Set-up and Selected Conditionsmentioning

confidence: 99%

“…The variety of available sub-models, which are representative of the most relevant engine components, allowed for an uncomplicated, accurate description of the CAI engine. 10,41,47…”

Section: Computational Approachmentioning

confidence: 99%

“…Previous studies have already described this engine and its variable valve actuation device in detail. 12,41,47…”

Section: Engine Set-up and Selected Conditionsmentioning

confidence: 99%

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Analysis of mixture structure and of its influence on combustion in a CAI engine

Knop

2017

International Journal of Engine Research

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Homogeneous Charge Compression Ignition (HCCI) combustion mode theoretically relies on a perfectly homogeneous air/fuel mixture simultaneously releasing heat across the whole combustion chamber. However, practical implementation always leads to a staged combustion process that is still significantly quicker than conventional sparkignition or compression-ignition combustion modes. The degree of combustion staging is central to the limitation of combustion-induced noise, to cycle efficiency, as well as to combustion stability and completion. The present study numerically explored on the whole operating map the mixture structure at ignition for a specific type of HCCI combustion, namely the Controlled Auto-Ignition (CAI) combustion mode attained through burnt gas trapping with negative valve overlap. The analysis of the complete CAI operating map outlined the similarity of mixture structure for any operating condition and the mixture/chemistry interactions depending on the end-of-compression temperature domain. Temperature stratification appeared as the key input defining combustion-induced noise and combustion stability but mean in-cylinder temperature and dilution combine with temperature stratification to define operating map limitations.

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Section: System Simulationmentioning

confidence: 99%

Section: Engine Set-up and Selected Conditionsmentioning

confidence: 99%

“…The variety of available sub-models, which are representative of the most relevant engine components, allowed for an uncomplicated, accurate description of the CAI engine. 10,41,47…”

Section: Computational Approachmentioning

confidence: 99%

“…Previous studies have already described this engine and its variable valve actuation device in detail. 12,41,47…”

Section: Engine Set-up and Selected Conditionsmentioning

confidence: 99%

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Analysis of mixture structure and of its influence on combustion in a CAI engine

Knop

2017

International Journal of Engine Research

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“…O início do período de ER e sua duração variaram de acordo com a carga e a estratégia de injeção para atingir uma eficiência indicada otimizada. Operação em regime HCCI não foi priorizada conforme[21]-[23]. O evento de abertura de válvula de admissão (IVO) foi configurado próximo ao TDC e o fechamento da válvula de admissão (IVC) foi configurado conforme a carga necessária.…”

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Estratégias Aprisionamento De Gases Residuais Para Motores De Ignição Por Centelha Com Etanol De Alta Eficiência

Lanzanova¹,

Mazer²,

Hatschbach³

et al. 2018

Blucher Engineering Proceedings

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Os biocombustíveis vêm sendo explorados na tentativa de reduzir as emissões de gases do efeito estufa e o consumo de combustíveis fósseis. Por esses mesmos propósitos, as recentes diretrizes legais sobre o controle de emissões demandam maiores eficiências para motores de ignição por centelha (SI) operando em carga parcial. Nesse contexto, este estudo investigou a utilização de estratégias não convencionais de tempos de válvula em um motor de testes monocilíndrico de 0,35 L e quatro válvulas operando com etanol anidro. Esse era equipado com um sistema de atuação de válvulas independente que permitia variabilidade total de momentos de abertura e fechamento de válvulas. Os processos negative valve overlap (NVO) e exhaust rebreathing (ER) foram avaliados como estratégias de aprisionamento de gases residuais. O fechamento precoce das válvulas de admissão (early intake valve closure, EIVC) foi empregado como método de controle de carga. A combustão SI convencional, com controle de carga através de restrição por borboleta na admissão (throtle spark ignition, tSI), foi testada para fins de comparação. Várias cargas parciais foram avaliadas em rotação fixa de 1500 rpm. O aumento de eficiência indicada pôde ser alcançado ao aplicar as estratégias de NVO e ER.

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Study on spark assisted compression ignition (SACI) combustion with positive valve overlap at medium–high load

Xie

Chen

et al. 2013

Applied Energy

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Influence of the Valve-lift Strategy in a CAI™ Engine using Exhaust Gas Re-Breathing - Part 1: Experimental Results and 0D Analysis

Cited by 10 publications

References 11 publications

Analysis of mixture structure and of its influence on combustion in a CAI engine

Analysis of mixture structure and of its influence on combustion in a CAI engine

Estratégias Aprisionamento De Gases Residuais Para Motores De Ignição Por Centelha Com Etanol De Alta Eficiência

Study on spark assisted compression ignition (SACI) combustion with positive valve overlap at medium–high load

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