Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine

Xu Zheng, Nan Zhou, Quan Zhou, Yi Qiu, Ruijun Liu and Zhiyong Hao
Additional contact information
Xu Zheng: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Nan Zhou: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Quan Zhou: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Yi Qiu: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Ruijun Liu: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Zhiyong Hao: College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Energies, 2020, vol. 13, issue 4, 1-25

Abstract: It is difficult to decompose the in-cylinder pressure of combustion of the direct injection (DI) diesel engine, a transient process associated with complicated oscillation components, because of its steep property. An adaptive cyclic average method based on time varying filter based empirical mode decomposition (TVF-EMD) is proposed to decompose the in-cylinder pressure signal, and the cyclic number is determined adaptively with protruding ratio of high-frequency oscillation. The proposed method is used to compare with the ensemble empirical mode decomposition and original TVF-EMD. The results indicate that the proposed method can overcome the drawbacks of these methods and extract high-frequency oscillations accurately and effectively. Three evaluation indexes, center frequency, normalized energy, and average center frequency are defined to analyze the frequency and energy characteristics of high-frequency oscillation quantitatively. The influence of speed, load, rail pressure, main injection timing, pilot injection interval, and pilot injection quantity are investigated systematically. The energy of high-frequency oscillation reaches the peak at medium-high speed, and increase with engine load and rail pressure. However, the relationship of high-frequency oscillation with fuel injection parameters are non-monotonic.

Keywords: DI diesel engine; combustion; adaptive cyclic average TVF-EMD; high-frequency; in-cylinder pressure oscillation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/4/871/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/4/871/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:4:p:871-:d:321444

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().