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Open AccessArticle

Effects of Direct Fuel Injection Strategies on Cycle-by-Cycle Variability in a Gasoline Homogeneous Charge Compression Ignition Engine: Sample Entropy Analysis

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Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland
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Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
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Instituto de Ingeniería Mecánica y Producción Industrial, Universidad de la República, 11300 Montevideo, Uruguay
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Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Av. IPN 2580, L. Ticomán, México DF 07340, Mexico
*
Author to whom correspondence should be addressed.
Entropy 2015, 17(2), 539-559; https://doi.org/10.3390/e17020539
Received: 4 December 2014 / Revised: 29 December 2014 / Accepted: 23 January 2015 / Published: 29 January 2015
In this study we summarize and analyze experimental observations of cyclic variability in homogeneous charge compression ignition (HCCI) combustion in a single-cylinder gasoline engine. The engine was configured with negative valve overlap (NVO) to trap residual gases from prior cycles and thus enable auto-ignition in successive cycles. Correlations were developed between different fuel injection strategies and cycle average combustion and work output profiles. Hypothesized physical mechanisms based on these correlations were then compared with trends in cycle-by-cycle predictability as revealed by sample entropy. The results of these comparisons help to clarify how fuel injection strategy can interact with prior cycle effects to affect combustion stability and so contribute to design control methods for HCCI engines. View Full-Text
Keywords: HCCI; direct injection; negative valve overlap; cycle-by-cycle variability; sample entropy HCCI; direct injection; negative valve overlap; cycle-by-cycle variability; sample entropy
MDPI and ACS Style

Hunicz, J.; Medina, A.; Litak, G.; Curto-Risso, P.L.; Guzmán-Vargas, L. Effects of Direct Fuel Injection Strategies on Cycle-by-Cycle Variability in a Gasoline Homogeneous Charge Compression Ignition Engine: Sample Entropy Analysis. Entropy 2015, 17, 539-559.

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