Accelerometer-Based Estimation of Combustion Features for Engine Feedback Control of Compression-Ignition Direct-Injection Engines

Eri R. Amezcua, Bryan Maldonado, David Rothamer, Kenneth Kim, Chol Bum Kweon, Anna Stefanopoulou

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

An experimental investigation of non-intrusive combustion sensing was performed using a tri-axial accelerometer mounted to the engine block of a small-bore high-speed 4-cylinder compression-ignition direct-injection (CIDI) engine. This study investigates potential techniques to extract combustion features from accelerometer signals to be used for cycle-to-cycle engine control. Selection of accelerometer location and vibration axis were performed by analyzing vibration signals for three different locations along the block for all three of the accelerometer axes. A magnitude squared coherence (MSC) statistical analysis was used to select the best location and axis. Based on previous work from the literature, the vibration signal filtering was optimized, and the filtered vibration signals were analyzed. It was found that the vibration signals correlate well with the second derivative of pressure during the initial stages of combustion. Two combustion parameters were the focus of this investigation, start of combustion (SOC) and crank-angle of fifty-percent heat release (CA50). The results show that, for a wide range of engine conditions, SOC can be obtained solely from the first derivative of the vibration signal with respect to crank angle, with SOC corresponding to the first peak of the derivative. A CA50 determination that assumes cumulative heat release correlates with the integral of the square of the vibration signal derivative was investigated. The approach shows some promise, but its fidelity appears to be limited in part by the system's vibration impulse response. The overall results demonstrate that an accelerometer can potentially provide sufficient combustion information for cycle-to-cycle combustion control.

Original languageEnglish
JournalSAE Technical Papers
Volume2020-April
Issue numberApril
DOIs
StatePublished - Apr 14 2020
Externally publishedYes
EventSAE 2020 World Congress Experience, WCX 2020 - Detroit, United States
Duration: Apr 21 2020Apr 23 2020

Funding

Research at the University of Wisconsin-Madison was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-16-2-0157. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.

FundersFunder number
Army Research LaboratoryW911NF-16-2-0157

    Fingerprint

    Dive into the research topics of 'Accelerometer-Based Estimation of Combustion Features for Engine Feedback Control of Compression-Ignition Direct-Injection Engines'. Together they form a unique fingerprint.

    Cite this