Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

Sen, Asok K.; Zheng, Jianjun; Huang, Zuohua

doi:10.1016/j.apenergy.2011.01.009

Cited by 73 publications

(14 citation statements)

References 57 publications

(66 reference statements)

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“…It has been studied with the variation in heat released during combustion [37,38], and by using continuous wavelet transform to analise Indicated Mean Effective Pressure (imep) time series [39]. Recently it also has been studied in Homogeneous Charge Compression Ignition (HCCI) engine processes [40,41], using complex CFD simulations [42] and using zero-dimensional predictive models based on stochastic estimation of the physically relevant parameters [43].…”

Section: Introductionmentioning

confidence: 99%

Study of the cycle-to-cycle variations of an internal combustion engine fuelled with natural gas/hydrogen blends from the diagnosis of combustion pressure

Reyes¹,

Melgar²,

Pérez³

et al. 2013

International Journal of Hydrogen Energy

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Spark ignition engine Combustion diagnosisAlternative fuels Genetic algorithm a b s t r a c tA methodology is presented for studying the influence of using alternative fuels on the cycle-to-cycle variations of a spark ignition engine which has been fuelled with mixtures of natural gas and hydrogen in different proportions (0e100%). The experimental facility consists of a single-cylindrical spark ignition engine coupled to an asynchronous machine IntroductionBecause of the increasing concern about energy deficiency and environmental defence, much effort has been focused on the use of alternative fuels in internal combustion engines (ICE). Alternative fuels are clean, when compared to conventional ones derived from petroleum in ICE. Natural gas (NG) is considered to be a probable alternative fuel due to its properties and higher octane number. NG is a mixture of different gases where methane is its main constituent (75e98% of methane; 0.5e13% of ethane; and 0e2.6% of propane [1] Available online at www.sciencedirect.com journal h om epa ge: www.elsev ier.com/locate/he i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 8 ( 2 0 1 3 ) 1 5 4 7 7 e1 5 4 8 7

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Section: Introductionmentioning

confidence: 99%

Study of the cycle-to-cycle variations of an internal combustion engine fuelled with natural gas/hydrogen blends from the diagnosis of combustion pressure

Reyes¹,

Melgar²,

Pérez³

et al. 2013

International Journal of Hydrogen Energy

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show abstract

“…Likewise, wavelet spectral analysis has been applied to long time series of discrete measurements to identify, on a time–frequency basis, episodes of organized patterns in the time series. 36,53–56 In the wavelet spectrum, some patterns persist over hundreds of engine cycles at nominally stable conditions, showing long-term structure in the engine dynamics, especially coupled with its control systems and environment, in ways not normally seen using methods that favor short timescales. An example wavelet spectrum is seen in Figure 5; this spectrum is like a Fourier spectrogram, which is a time–frequency–power representation, but wavelet functions instead of sinusoidal functions are used as the basis.…”

Section: Characterization Of Engine Dynamicsmentioning

confidence: 99%

Invited Review: A review of deterministic effects in cyclic variability of internal combustion engines

Finney

Kaul

Daw

et al. 2015

International Journal of Engine Research

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We review developments in the understanding of cycle-to-cycle variability in internal combustion engines, with a focus on spark-ignited and premixed combustion conditions. Much of the research on cyclic variability has focused on stochastic aspects, that is, features that can be modeled as inherently random with no short-term predictability. In some cases, models of this type appear to work very well at describing experimental observations, but the lack of predictability limits control options. Also, even when the statistical properties of the stochastic variations are known, it can be very difficult to discern their underlying physical causes and thus mitigate them. Some recent studies have demonstrated that under some conditions, cyclic combustion variations can have a relatively high degree of low-dimensional deterministic structure, which implies some degree of predictability and potential for real-time control. These deterministic effects are typically more pronounced near critical stability limits (e.g. near tipping points associated with ignition or flame propagation) such during highly dilute fueling or near the onset of homogeneous charge compression ignition. We review recent progress in experimental and analytical characterization of cyclic variability where low-dimensional, deterministic effects have been observed. We describe some theories about the sources of these dynamical features and discuss prospects for interactive control and improved engine designs. Taken as a whole, the research summarized here implies that the deterministic component of cyclic variability will become a pivotal issue (and potential opportunity) as engine manufacturers strive to meet aggressive emissions and fuel economy regulations in the coming decades.

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“…The CCVs in SI engine have generally been addressed in the literature [16][17][18][19]. It is one of the various factors which have to be admitted into consideration in modelling, control and design of SI engines.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

Cited by 73 publications

References 57 publications

Study of the cycle-to-cycle variations of an internal combustion engine fuelled with natural gas/hydrogen blends from the diagnosis of combustion pressure

Study of the cycle-to-cycle variations of an internal combustion engine fuelled with natural gas/hydrogen blends from the diagnosis of combustion pressure

Invited Review: A review of deterministic effects in cyclic variability of internal combustion engines

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

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