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

Entropy

Jacek Hunicz²  Alejandro Medina¹  Grzegorz Litak²  Pedro L. Curto-Risso³ 

[1] Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain;Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland; E-Mails:;Instituto de Ingeniería Mecánica y Producción Industrial, Universidad de la República, 11300 Montevideo, Uruguay; E-Mail:

关键词: HCCI;    direct injection;    negative valve overlap;    cycle-by-cycle variability;    sample entropy;   

DOI  :  10.3390/e17020539

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland