Autor: Cygnar, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Modelling of process of injection and combustion in two - cycle engine
Autorzy:: Cygnar, M.
Tematy:: two cycle engine
two fuel injection systems; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246482.pdf Link otwiera się w nowym oknie
Opis:: Article presents simulated research and visualization of combustion process of four-cylinder test engine based on the spark ignition engine Toyota Yaris 1.300 cm3, equipped with two systems of power supply i.e. : fundamental and ignition. Two methods of initiating the combustion process were applied in the engine, that is : from spark ignition and after it has turned off - the combustion is initiated by means of the injection of the ignition dose. The conducted research was aimed at revealing the differences in the combustion process and the engine performance, especially the changes of pressure in the cylinder for that kind of dual-fuel power engine supply. The ignition dose injected to cylinder was equal to about 5% of the general mass of the fuel given to the engine. The mass of the fuel injected to the infold manifold determined the remaining part, and direct injection of fuel took place for several dozen rotation degrees of the crankshaft before TDC (Top Dead Centre). A spatial grid of the engine's model (preprocessor) was created as well as the modification of the source KIVA 3V program was executed, consisting of taking into account two systems of injection. It is necessary to mention, that KIVA 3V program contains only one source of fuel's injection as a default. On two-dimensional graphs, the courses of changes of pressure and temperature are presented as well as the change of the mass of the injected ignition dose. A simulation was conducted for chosen rotation angles of the crankshaft, for the purpose of a radical analysis of thermodynamic parameters along with an analysis of the toxic components of the exhaust fumes. The conclusions of the conducted simulated research confirm the reduction of fuel consumption with a simultaneous reduction of the emissions of toxic exhaust fumes components.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of parameters of the engine working in two thermodynamic cycles
Autorzy:: Cygnar, M.
Tematy:: two cycle engine
two fuel injection systems; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247920.pdf Link otwiera się w nowym oknie
Opis:: The article presents an experimental research conducted on a test engine based on a driving unit with a spark ignition Toyota Yaris 1,300 cm 3, equipped with two systems of power supply i.e.: fundamental and ignition. Two methods of initiating the combustion process were applied in the engine i.e.: from spark ignition and after it has turned off - the combustion is initiated by means of the injection of the ignition dose. The fundamental task of The adaptation of two power supply systems for a combustion engine is the possibility of work in two thermodynamic circulations, which permits better conditions for creating the fuel-air mixture, which translates directly into significant improvement of the engine's working parameters accuracy, such as general efficiency as well as the individual fuel consumption. The experimental research presented in this work consist of designing and construction of an engine with two injection systems with a controller managing the automatic change of the work mode, as well as the execution of the analysis of the chosen work parameters in a two-cycle engine i.e.: - comparative research on the engine's work performance, when it works with a spark ignition and when it is initiated with the autoignition of the ignition dose, - determining the increase in the general efficiency of the two-cycle engine, working with the injection of the ignition dose, in comparison with the conventional power supply system with the initiation of the combustion process from an electric discharge between the spark plug electrodes. Applying the two-cycle engine with two power supply systems with an automatic spark ignition presented in this article, along with the electronically controlled system of changing the ignition method, increases the general efficiency in the total range of rotational speed, compared with the conventional engines with the automatic spark ignition
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of the total efficiency for engine with spark - ignition and compression - ignition
Autorzy:: Cygnar, M.
Budzik, G.
Tematy:: two fuel injection systems
spark-ignition
compression-ignition engines; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246712.pdf Link otwiera się w nowym oknie
Opis:: This paper presented of developing a power system for two fuel injection systems – spark ignition and compression ignition. Two ways to initiate combustion process were used: initially the spark ignition, and after it turns off - the combustion is initiated by the injection of ignition injected fuel. The composition of the ignition dose was developed through the research conducted in order to adjust the right proportions of chemical components to obtain the best parameters of the combustion process. The study considered the performance of the ignition dose injected into the engine cylinder and its evaporation process, the charge stratification, the formation of toxic emission and the total efficiency of the engine. Experimental studies were carried out on a test engine equipped with two injection systems and automatic mode change control management. The scope of research included: – determining the basic characteristics of the engine operation, taking into account the injection advance angle of the ignition dose, – comparative studies of engine performance and exhaust gas composition, working with spark ignition and initiated by compression ignition of the ignition dose, – determining the increase in the general efficiency of the two-circulation engine working with injection of ignition dose compared to conventional power system with the initiation of combustion process from the spark plug.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modification of the procedure of diagnostic inference for TPMS
Modyfikacja procedury wnioskowania diagnostycznego dla układu TPMS
Autorzy:: Cieślikowski, B.
Cygnar, M.
Kochanek, A.
Tematy:: TPMS
Tyre-Pressure Monitoring System
tyre
temperature control
procedure
układ TPMS
kontrola temperatury
opona
procedura; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Powiązania:: https://bibliotekanauki.pl/articles/334808.pdf Link otwiera się w nowym oknie
Opis:: The subject of the paper is to modify the procedure of inference for TPMS (Tyre-Pressure Monitoring System) with regard to an earlier identification of the excessive temperature rise in tyres before they exceed thermal limits. This shall allow to limit the risk of accidents caused by destruction of a tyre. An important issue indicating functional features of TPMS consists in a possibility of rapidly warning a driver immediately after a potentially dangerous rise of temperature. Traction tests have been carried out with use of a passenger car equipped with TPMS with P409 sensors and TH9P409S measuring module. Time characteristics of tyre temperature signals were included indicating the way of their use for the process of estimation of a warning signal. A change trend model of an analysed parameter in time function was developed.
Przedmiotem publikacji jest modyfikacja procesu wnioskowania w systemie TPMS (Tyre Pressure Monitoring System) w zakresie wcześniejszej identyfikacji nadmiernego przyrostu temperatury opony zanim zostaną przekroczone limity dopuszczalne. Pozwoli to na ograniczenie skutków destrukcji opony zmniejszając przy tym ryzyko wypadkowości. Istotnym zagadnieniem wyrażającym cechy funkcjonalne układu TPMS jest zdolność szybkiej estymacji sygnału ostrzegawczego o stanie awaryjnym opony. Przeprowadzono testy trakcyjne samochodu osobowego wyposażonego w układ TPMS z czujnikami P409 i modułem pomiarowym TH9P409S. Zamieszczono charakterystyki czasowe sygnałów temperatury opony wskazując na ich wykorzystanie dla estymacji sygnału ostrzegawczego. Opracowano model trendu zmiany analizowanego parametru w funkcji czasowej.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Mathematical model phases of fuel injection in the spark -ignition engine with direct fuel injection during work on the heterogeneous mixture
Autorzy:: Sendyka, B.
Cygnar, M.
Janisz, K.
Tematy:: transport
internal combustion engine
fuel injection system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243627.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the methods and results of calculation of time necessary for transmission of a jet of stratified charge from the injector to the gap between the electrodes of the ignition plug, which is the basis for determination of the advance angle of fuel injection in relation to the advance angle of ignition. This time is the sum of duration of four phases of load jet way and is calculated basing upon a number of empiric formulae taken from recent publications. Constructors of gasoline engines are faced with higher and higher requirements as regards ecological problems and increase in engine efficiency at a simultaneous decrease in fuel consumption. Satisfaction of these requirements is possible due to recognition of the phenomena occurring inside the engine cylinder, choice of suitable optimal parameters of the fuel injection process, and determination of geometrical shapes of the combustion chamber and piston head. Increase of engine efficiency is connected, first of all, with the changes in fuel supply, it means a proper regulation of fuel - air mixture in dependence on the rotational speed and load; hence, combustion of stratified mixtures in a gasoline engines with direct fuel injection is essential for increase in efficiency with a simultaneous decrease in emission of toxic components of exhaust gases and fuel consumption. Such a kind of supply systems show that, apart from combustion of very lean mixtures a gasoline engine with direct fuel injection possesses many other advantages, i.e.: fuel consumption comparable with other engines with self - induced ignition, greater power than in other spark ignition engines with multi - point fuel injection. The results of the performed analysis were given in two-dimensional diagrams.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of technological process of installation turbochargers
Autorzy:: Cygnar, M.
Mazurków, A.
Jaskólski, J.
Tematy:: turbocharger
installation of turbocharger's group
turbine's rotor
compressor's rotor; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244108.pdf Link otwiera się w nowym oknie
Opis:: The technological process of installation of turbocharger as well as detailed analysis of chosen stages of installation having fundamental influence on the correct work of the turbocharger are presented in the article. The purpose of this article is performance of whole process of installation turbocharger as well as analysis of particularly significant stages of this process. The creature of turbocharging and it is myself this of working of turbocharger is enough simple. Difficulties appear if we put to the analysis conditions work of turbocharger: high temperature offumes, variable loads, aggressive environment of combustion gases, high rotatory speeds of rotors. Some of exploitation problems are possible to the elimination on the design stage or by means of application of appropriate materials. However technological process of installation is responsible for output quality and failure-free lasting work of turbocharger. In the process of installation it can distinguish some essential stages: processing and installation of shaft with the turbine's rotor, the weighing of turbine's rotor and the compressor, the installation of rotor's group, weighing of rotor's group in the trunk, positional tests under load. High rotary speeds cause during work of rotator so that created during of installation of turbocharger inappropriate balancing can bring to important damages of turbocharger. The correct course of process of installation and the final verification on braked position allows to avoid most of breakdowns of turbocharger group as well as to ensure long term of correct exploitation.From this reason very important is detailed analysis of respective stages of installation of group.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Multifaceted diagnostic inference process for identifying the causes of self-ignition engine faults resulting from PM sediments
Autorzy:: Cieślikowski, B.
Cygnar, M.
Jakóbiec, J.
Tematy:: VGT turbocharger
PM particulates
diagnostic tester
spectral analysis
error code
cząstki PM
tester diagnostyczny
analiza spektralna
kod błędu; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/133184.pdf Link otwiera się w nowym oknie
Opis:: Optimization of the fuel combustion process in a self-ignition engine with the multi-stage HPCR injection system sets the main trends in research on the thermodynamic stability of fuels, and the mechanisms of PM formation. The stages were indicated of the multifaceted diagnostic inference on the causes of failures of a turbocharger with variable geometry (VTG) which occur as a result of PM sedimentation in the nozzle area. An evaluation of the engine performance was conducted using a dedicated tester and an additional recording of the injector coil current characteristics with parallel readings of the fuel pressure variation in the reservoir. The indicated procedure established the underlying cause of the VTG compressor failure despite the absence of a recorded error code.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Tooth contact analysis of hypoid gear transmission prototypes manufacturing with vacuum casting methods
Autorzy:: Budzik, G.
Markowski, T.
Sobolak, M.
Cygnar, M.
Tematy:: tooth contact analysis
vacuum casting
hypoid gears; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242202.pdf Link otwiera się w nowym oknie
Opis:: The article presents the experimental method of instantaneous contact area in hypoid gear transmission. The prototypes of hypoid gear have been made with one of the rapid prototyping method — Vacuum Casting process. This method permits to manufacture gear wheel with very complicated tooth profile in silicone tool (form or matrix) created in vacuum chamber with reduced pressure. Silicone matrix allows creating prototype in casting process or low pressure process. Silicone matrix has been made on the basis of gear transmission of car transmission system. Gears were made of transparent polymer materials to enable observation of the instantaneous contact area. The instantaneous contact area is that tooth flank surface area, which is in contact with mating surface of another tooth at a specific moment. Correct mating of gears and their kinematic precision depend on the shape and size of instantaneous contact area, as well as on changes during gear 's rotation. Contact between gear surfaces of geometrically ideal gearbox occurs at a point or line, but, because of a deformability of mating teeth flanks, in reality it is always a certain surface. The method of tooth contact area as described in the paper, permits a dynamic determination of the gearbox mating area. Existing experimental methods permit only a static observation of the mating area.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Test bed investigation of the Si engine working on heterogenious mixture
Badania stanowiskowe silnika benzynowego pracującego na mieszance uwarstwionej
Autorzy:: Budzik, G.
Cygnar, M.
Janisz, K.
Młynarski, S.
Tematy:: silnik GDI
mieszanka uwarstwiona
wizualizacja
proces spalania
GDI engine
visualisation
stratified charge
combustion process; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/256210.pdf Link otwiera się w nowym oknie
Opis:: The paper investigates the demonstration of the increase in total efficiency of a GDI engine in dependence on the parameters of mixture formation and the range of load at determined states of engine work in dependence on the rotational speed of the engine. By use of the newest simulation programme KIVA 3V, the possibilities of up-to-date methods of calculation of changes of temperatures, pressures, and the formation of toxic components during the process of stratified charge combustion were presented. The elaborate mathematical models, used in calculations, describing the processes occurring inside the cylinder of the engine, permit one to create complicated virtual models reflecting the real conditions in a satisfactory way. The correctness of calculation results is determined by the quality of input data, which can be obtained based on model investigations. In the experimental section, investigations on a test bed with use of specialist apparatus for visualisations of inside cylinder processes were discussed. By use of visualisation, observation was performed of the run of the fuel jet from the moment of injection, consequent by rebounding of the fuel from the piston head, on to reaching under the gap between the electrodes of the ignition plug and flame spreading from the moment of ignition till the end of the combustion process. For the determination of the total efficiency of a Gasoline Direct Injection engine, test bed investigations were carried out with the aim of determining the speed and load characteristics of the investigated engine. On this basis, the total efficiency of a GDI engine can be determined.
Zakres pracy obejmuje wykazanie zwiększenia sprawności ogólnej silnika GDI w zależności od parametrów tworzenia mieszanki i zakresu obciążenia w określonych stanach pracy silnika w funkcji prędkości obrotowej silnika. Za pomocą programu symulacyjnego KIVA 3V przedstawione zostały możliwości nowoczesnych metod obliczeniowych przebiegów temperatur, ciśnień, powstawania składników toksycznych w czasie procesu spalania ładunku uwarstwionego. Wykorzystane w obliczeniach modele matematyczne pozwalają na tworzenie skomplikowanych modeli wirtualnych, które w zadowalający sposób odzwierciedlają warunki rzeczywiste. Poprawność wyników obliczeń zdeterminowana jest jakością danych wejściowych, które możemy uzyskać w oparciu o badania modelowe. W części doświadczalnej omówione zostały badania na stanowisku badawczym z wykorzystaniem specjalistycznej aparatury do wizualizacji procesów wewnątrz cylindra. Zakres badań obejmował wizualizację procesu spalania w silniku GDI dla różnych rodzajów obciążeń i parametrów tworzonej mieszanki paliwowo-powietrznej. Do określenia sprawności ogólnej silnika benzynowego z bezpośrednim wtryskiem paliwa zostały przeprowadzone badania stanowiskowe, których celem było wyznaczenie charakterystyk prędkościowych i obciążeniowych badanego silnika.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The research of rotating sets in turbochargers, the influence of relative width of sliding bearings with a floating ring on static and dynamic properties
Autorzy:: Cygnar, M.
Aleksander, M.
Mazurkow, A.
Budzik, G.
Tematy:: turbocharger
rotating unit
sliding bearing with a floatin; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242325.pdf Link otwiera się w nowym oknie
Opis:: This work is the continuation of the research concerning the dynamic model of a rotating set in turbocharger. In this model masses of rotors and a shaft have been modelled as concentrated masses. The rotating set has been propped on two supports forming lateral sliding bearings with a floating ring bearing. Each bearing is designed including floating ring bearing mass. The shaft of a rotating set spins at angular velocity omega 1 whereas a floating ring bearing spins at angular speed omega 2. A mathematical model constitutes a system of differential equations, mutually coupled. The mathematical model has been solved by determining: acceleration, velocity and displacement in each knot. The paper shows the crucial influence of a bearing relative clearance on static and dynamic properties of a rotating set in a turbocharger. The authors suggest that the rotating set works stably only in these cases as for given parameters, we choose properly oil films' geometry. In the conclusion, the authors formulate proposal that might be usefulfor the designers who deal with these types of bearings. Especially, the mathematical model o f a turbocharger rotating set, work parameters of bearing knots, researches of static and dynamic properties are presented in the paper.
Dostawca treści:: Biblioteka Nauki

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