Experimental Investigation of Deterministic and Random Cyclic Patterns in HCCI Engine using Symbol Sequence Approach

Maurya, Rakesh Kumar

doi:10.1007/s40997-018-0158-9

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…It is believed that the cycles more than just the immediate cycle to the current cycle may affect the combustion. 16 Therefore, recurrence rate, determinism, and the average length of diagonal lines of the cross-recurrence plots (Figures 9–12) are calculated up to a lag of five combustion cycles in both positive and negative directions. The present study considers θ P max and CA 50 (+ve relations) and also θ P max and −CA 50 time series (−ve relations) for each diagonal line parallel to the LOS.…”

Section: Resultsmentioning

confidence: 99%

“…15 When investigated using Symbol Sequence approach, burn duration and IMEP of an HCCI engine showed maximum determinism for the richest and the leanest mixture, respectively. 16 Sen et al 17 reported that during shifting of engine operation from SI to HCCI mode, the intermediate states had a wide range of very large-amplitude oscillations with persistent low-frequency periodicities and intermittent high-frequency bursts. Ghazimirsaied et al 18 observed deterministic patterns in the return maps and Symbol-Sequence Histograms (SSH) of CA 50 time series of an HCCI engine operating near to the misfire limit.…”

Section: Introductionmentioning

confidence: 99%

“…It is also advised to use different control parameters depending on the operating condition of an HCCI engine. 16 The online available literature lacks such an investigation which explores about the deterministic characteristics of different combustion metrics representing underlying cyclic combustion dynamics of HCCI engine. Recently, the present authors investigated the deterministic characteristics of Q HR obtained from a gasoline operated HCCI engine.…”

Section: Introductionmentioning

confidence: 99%

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Effects of intake charge temperature and relative air-fuel ratio on the deterministic characteristics of cyclic combustion dynamics of a HCCI engine

Singh

Maurya

2022

International Journal of Engine Research

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Homogenous charge compression ignition (HCCI) combustion can significantly reduce automotive pollution and increase the thermal efficiency of the engine. However, combustion phasing control is a major challenge in HCCI engines due to severe cyclic combustion variations. This study investigates the cyclic combustion dynamics of the HCCI engine using nonlinear dynamic methods such as return maps, recurrence plots (RPs), and recurrence quantitative analysis (RQA). Combustion stability and cyclic variations of HCCI combustion parameters were investigated on a modified four-stroke diesel engine. The experiments were conducted by varying relative air-fuel ratios ([Formula: see text]) and intake air temperatures ([Formula: see text]) at two engine speeds. In-cylinder pressure data of 2000 consecutive engine combustion cycles is logged for each test condition. In this study, deterministic characteristics of combustion phasing (CA50) and crank angle position of maximum cylinder pressure ([Formula: see text]) are investigated and compared by employing nonlinear dynamical methods. Return maps revealed that [Formula: see text] is having distinct and more frequently observed deterministic characteristics in comparison to CA50. Patterns in RPs showed a more persistent and sudden change in the combustion dynamics at higher engine speeds. Recurrence plot-based analysis found the existence of deterministic features in the combustion dynamics irrespective of the operating conditions. It was found using RQA parameters that the deterministic nature becomes stronger with a decrease in [Formula: see text] and any deviation in intermediate values of [Formula: see text]. Additionally, RQA measures advocate that CA50 has more deterministic characteristics at higher engine speed while [Formula: see text] at lower engine speed. Strong coupling and synchronization between [Formula: see text] and CA50 is indicated by cross-recurrence plots and CPR index when engine operated with a comparatively richer mixture.

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