Cycle-to-cycle variations in diesel engines

Kyrtatos, Panagiotis; Brückner, Clemens; Boulouchos, Konstantinos

doi:10.1016/j.apenergy.2016.03.015

Cited by 64 publications

(24 citation statements)

References 29 publications

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“…Co-combustion of alternative fuels such as alcohols causes lowering in cylinder temperature which then affects the value of the ignition delay due to higher value of heat of evaporation of alcohols. In the paper [28] results are presented of investigation of in-cycle pressure fluctuation intensity under long ignition delay conditions. Authors stated that under low temperature charge conditions, the difference in peak pressure between the average cycle and cycles showed low fluctuation intensity.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

et al. 2019

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The co-combustion of diesel with alcohol fuels in a compression ignition dual fuel engine is one of the ways of using alternative fuels to power combustion engines. Scientific explorations in this respect should not only concern the combustion process in one engine cycle, which is most often not representative for a longer engine life, but should also include an analysis of multiple cycles, which would allow for indicating reliable parameters of engine operation and its stability. This paper presents experimental examinations of a CI engine with a dual fuel system, in which co-combustion was performed for diesel and two alcohol fuels (methanol and ethanol) with energy contents of 20%, 30%, 40% and 50%. The research included the analysis of the combustion process and the analysis of cycle-by-cycle variation of the 200 subsequent engine operation cycles. It was shown that the presence and increase in the share of methanol and ethanol used for co-combustion with diesel fuel causes an increase in ignition delay and increases the heat release rate and maximum combustion pressure values. A larger ignition delay is observed for co-combustion with methanol. Based on changes in the coefficient of variation of the indicated mean effective pressure (COVIMEP) and the function of probability density of the indicated mean effective pressure (f(IMEP)), prepared for a series of engine operation cycles, it can be stated that the increase in the percentage of alcohol fuel used for co-combustion with diesel fuel does not impair combustion stability. For the highest percentage of alcohol fuel (50%), the co-combustion of diesel with methanol shows a better stability.

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Section: Introductionmentioning

confidence: 99%

“…The average intensity of the pressure fluctuations showed an increase with increasing amounts of the premixed combustion phase. This resulted in higher cycle-to-cycle variations under these conditions [28]. Other works presented comparative analysis of the impact of fuel on the uniqueness of engine cycles.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

et al. 2019

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“…conventional filtering method cannot meet the needs of rail pressure control of the OPCI, the OBS is specially designed to achieve a better control effect. It has been recognized that fuel injection cycle-to-cycle variation substantially reduces the engine performance [24,25]. Whereas fuel injection pressure oscillation and injected quantity cycle-to-cycle variation become more prominent in the OPCI, it is surprising to find that most previous studies on fuel injection of OPCI were concerned with spray layout [26,27] optimization and spray combustion characteristics [28].…”

Section: Control Principle Of Crsmentioning

confidence: 99%

On the Effect of a Rail Pressure Error State Observer in Reducing Fuel Injection Cycle-to-Cycle Variation in an Opposed-Piston Compression Ignition Engine

Zuo

Zhang

et al. 2018

Energies

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Abstract:The fuel injection cycle-to-cycle variation characteristic in an opposed-piston compression ignition engine was investigated experimentally. Based on the optimal Proportion Integration Differentiation (PID) method, a new control method was proposed by utilizing a rail pressure error state observer (OBS) before feedback. Compared with the conventional filtering treatment method, the OBS method was developed to simultaneously account for the flow mass changing and the dynamics of a common rail system, rather than representing the rail pressure state as an average value over a period time. The OBS method was subsequently implemented in the control system to investigate the injection pressure oscillation characteristic and cycle-to-cycle variation of injected fuel quantity. The results show that the present OBS method substantially reduces the injection pressure oscillation, improves response characteristics of the control system, and produces qualitatively satisfactory fuel injection cycle-to-cycle variation in the opposed-piston compression ignition (OPCI) engine.

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“…Several techniques were used to decrease the pressure and temperature of the end gas including utilizing the charge cooling effect of direct injection [6], using exhaust gas recirculation (EGR) [7], and retarding the spark timing, decreasing [8] the effective compression ratio (CR) by variable valve operation [9]. Cycle-to-cycle variations (CCV) may become the limiting factor for the operational range of the engine design [10], lead to decreased efficiency due to potential detonation [11], and reduce HC emissions resulting from incomplete combustion [12]. Enhanced Processes 2019, 7, 817 2 of 11 understanding of the CCV could afford important insights to design engines to be reliably run closer to detonation-limited conditions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…CCV is most recognized in SI engines, where they are produced by fluctuations in the burn rate for each successive cycle. This fluctuation could have several root causes: CCV in the amount of fuel, CCV in the cylinder gas motion, air and CCV of the mixture composition near the spark plug or exhaust gases present in the cylinder, leading to variations in combustion speed or local end-gas auto-ignition [10].…”

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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Cycle-to-cycle variations in diesel engines

Cited by 64 publications

References 29 publications

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

Comparative Analysis of the Combustion Stability of Diesel-Methanol and Diesel-Ethanol in a Dual Fuel Engine

On the Effect of a Rail Pressure Error State Observer in Reducing Fuel Injection Cycle-to-Cycle Variation in an Opposed-Piston Compression Ignition Engine

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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