Experimental study on knock sources in spark ignition engine with exhaust gas recirculation

Božić, Mladen; Vučetić, Ante; Sjerić, Momir; Kozarac, Darko; Lulić, Zoran

doi:10.1016/j.enconman.2018.03.053

Cited by 32 publications

(7 citation statements)

References 18 publications

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“…The main peak in severe knock appears at (0.1445, 0.1445), which is equivalent to 7398 hertz, while the main peak in light knock appears at (0.1484, 0.1484), which is comparable to 7598 hertz. The vibration mode frequencies of knock in car engines are typically between (20-6)kilohertz [2]. Furthermore, the engine knocks are caused by anomalous combustioninduced chamber resonances.…”

Section: Resultsmentioning

confidence: 99%

“…Bianco et al [1] they used a passive TJI system to build a methodology for 3D-CFD modeling of combustion and knock onset risk in a high-performance turbocharged engine, which they adapted to a TJI system.It has been possible to construct two unique knock-risk indicators that are based on the progress of chemical processes occurring within a combustion chamber as a consequence of the development of an evaluation approach for knock onset risk assessment. In an experimental setting, Boi et al [2] look at how exhaust gas recirculation affects a spark ignition engine's susceptibility to knock. End-gas pressure and temperature profiles are altered as a result of the influence on flame propagation on the combustion profile.…”

Section: Literature Diagrammentioning

confidence: 99%

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Simulation of Piezoelectric in Engine Knock Sensor with Different Frequency Modes

Shijer¹

2022

ECS Trans.

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A numerical study on deformation piezoelectric sensors is described in this study. Major objectives of this research are to compare the impacts of direct current voltage on piezoelectric structure, the effects of direct current voltage on the resonance frequency of piezoelectric knock sensors, and the effects of these parameters on the sensitivity and accuracy of the sensors. The impedance properties of the transient structure are studied under different engine operating conditions and in relation to various forms of sensor damage. Determining the degree of damage sensors and the prediction quality of the piezoelement within the sensor may be accomplished by measuring material flaws and fluctuations in material coefficients that are connected to the frequency characteristic of the sensor. To some extent, the preceding can be used in the calculations of several structural parts of knock sensors. On a prototype knock sensor, ranges of modes were tested using piezoelectric elements with varying numbers of cracks. In this work, it has discussed seven scenarios of frequency analysis to examine the piezoelectric in engine knock sensor with different electricity modes of operation. These scenarios include the engine normal operation mode, start engine operation mode, and different frequency of operation mode (2Hz, 200Hz, 2KHz, 20KHz, 200KHz).

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Section: Resultsmentioning

confidence: 99%

Section: Literature Diagrammentioning

confidence: 99%

Simulation of Piezoelectric in Engine Knock Sensor with Different Frequency Modes

Shijer¹

2022

ECS Trans.

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Section: Methodsmentioning

confidence: 99%

“…The base of the setup is a modified single-cylinder engine Hatz 1D81 connected to an AC dynamometer and equipped with multiple measurement devices. The schematic layout of the experimental setup is given in Figure 1, and details of the setup and the measurement equipment can be found in [22]. To perform the experiments required for this work, the existing research engine was significantly modified, and additional systems were added to the experimental setup.…”

Section: Methodsmentioning

confidence: 99%

Optimization of Pre-Chamber Geometry and Operating Parameters in a Turbulent Jet Ignition Engine

et al. 2022

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A turbulent jet ignition engine enables operation with lean mixtures, decreasing nitrogen oxide (NOX) emissions up to 92%, while the engine efficiency can be increased compared to conventional spark-ignition engines. The geometry of the pre-chamber and engine operating parameters play the most important role in the performance of turbulent jet ignition engines and, therefore, must be optimized. The initial experimental and 3D CFD results of a single-cylinder engine fueled by gasoline were used for the calibration of a 0D/1D simulation model. The 0D/1D simulation model was upgraded to capture the effects of multiple flame propagations, and the evolution of the turbulence level was described by the new K-k-ε turbulence model, which considers the strong turbulent jets occurring in the main chamber. The optimization of the pre-chamber volume, the orifice diameter, the injected fuel mass in the pre-chamber and the spark timing was made over 9 different operating points covering the variation in engine speed and load with the objective of minimizing the fuel consumption while avoiding knock. Two optimization methods using 0D/1D simulations were presented: an individual optimization method for each operating point and a simultaneous optimization method over 9 operating points. It was found that the optimal pre-chamber volume at each operating point was around 5% of the clearance volume, while the favorable orifice diameters depended on engine load, with optimal values around 2.5 mm and 1.2 mm at stoichiometric mixtures and lean mixtures, respectively. Simultaneous optimization of the pre-chamber geometry for all considered operating points resulted in a pre-chamber volume equal to 5.14% of the clearance volume and an orifice diameter of 1.1 mm.

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“…Today, major attention is given to the reduction of GHG and minimisation of those which are harmful, especially nitrogen oxides and particular matter. Emission of nitrogen oxides (NOx) occurs in an engine cylinder by oxidation of atmospheric nitrogen typically at temperatures higher than 1,800 K [5]. They can further be divided into nitrogen monoxide (NO) and nitrogen dioxide (NO2).…”

Section: Introductionmentioning

confidence: 99%

Possibilities for the Use of Biofuels in Europe and in Serbia

Terzić¹,

Šušteršič²,

Nešović³

et al. 2018

MVM

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Despite significant improvements in vehicle technology in recent years, vehicle emissions remain a major influencing factor on air quality. Although air quality in the City of Zagreb is still relatively acceptable, official standards, i.e. limiting values are under threat. More than ever, policymakers are actively exploring options for new vehicle emission control and local fleet management policies, as well as the new monitoring technologies to support these activities. The goal of the research was to assess the influence of the introduction of Low Emission Zone on the total emission from the road traffic in the City of Zagreb. To make a model of emissions from road traffic, emissions on selected roads in the City of Zagreb using measured traffic activity data and adequate vehicle fleet characteristics description are calculated. Traffic activity data were obtained from traffic study of the City of Zagreb, while vehicle fleet characteristics are extracted from the database maintained by Center for Vehicles of Croatia and the Ministry of the Interior of the Republic of Croatia. The database contains all the data collected during the homologation process of the vehicles registered in Croatia as well as the data collected during the vehicle periodical technical inspection.

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Experimental study on knock sources in spark ignition engine with exhaust gas recirculation

Cited by 32 publications

References 18 publications

Simulation of Piezoelectric in Engine Knock Sensor with Different Frequency Modes

Simulation of Piezoelectric in Engine Knock Sensor with Different Frequency Modes

Optimization of Pre-Chamber Geometry and Operating Parameters in a Turbulent Jet Ignition Engine

Possibilities for the Use of Biofuels in Europe and in Serbia

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