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Wavelet Analysis of the Effect of Injection Strategies on Cycle to Cycle Variation GDI Optical Engine under Clean and Fouled Injector

1
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
2
Mechanical & Nuclear Engineering Department, University of Sharjah, Sharjah PO Box 27272, UAE
3
Renewable Energy Research Unit, Northern Technical University, Kirkuk 36001, Iraq
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(11), 817; https://doi.org/10.3390/pr7110817
Received: 6 September 2019 / Revised: 31 October 2019 / Accepted: 1 November 2019 / Published: 5 November 2019
(This article belongs to the Section Advanced Digital and Other Processes)
High fluctuation in cyclic variations influences engine combustion negatively, leading to higher fuel consumption, lower performance, and drivability problems. This paper examines the impacts of injection strategies (injection pressure, injection timing and injection duration) on the cyclic variation of gasoline spark ignition (SI) optical engine under clean and fouled injectors. The principal oscillatory modes of the cycle to cycle variation have been identified, and the engine cycles over which these modes may persist are described. Through the wavelet power spectrum, the presence of short, intermediate and long-term periodicities in the pressure signal have been detected. It was noticed that depending on the clean and fouled injector, the long and intermediate-term periodicities may span many cycles, whereas the short-period oscillations tend to appear intermittently. Information of these periodicities could be helpful to promote efficient control strategies for better combustion. The outcomes report that the cyclic variation of the IMEP happens on multiple timescales, and thus, display complex dynamics. As the fouled injector used, mainly intermittent high-frequency fluctuations are recognized. View Full-Text
Keywords: wavelet analysis; cycle to cycle variation; fouled injector; GDI engine wavelet analysis; cycle to cycle variation; fouled injector; GDI engine
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MDPI and ACS Style

Awad, O.I.; Zhang, Z.; Kamil, M.; Ma, X.; Ali, O.M.; Shuai, S. Wavelet Analysis of the Effect of Injection Strategies on Cycle to Cycle Variation GDI Optical Engine under Clean and Fouled Injector. Processes 2019, 7, 817. https://doi.org/10.3390/pr7110817

AMA Style

Awad OI, Zhang Z, Kamil M, Ma X, Ali OM, Shuai S. Wavelet Analysis of the Effect of Injection Strategies on Cycle to Cycle Variation GDI Optical Engine under Clean and Fouled Injector. Processes. 2019; 7(11):817. https://doi.org/10.3390/pr7110817

Chicago/Turabian Style

Awad, Omar I., Zhou Zhang, Mohammed Kamil, Xiao Ma, Obed M. Ali, and Shijin Shuai. 2019. "Wavelet Analysis of the Effect of Injection Strategies on Cycle to Cycle Variation GDI Optical Engine under Clean and Fouled Injector" Processes 7, no. 11: 817. https://doi.org/10.3390/pr7110817

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