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Up-to-date Supercharged Petrol Engines
Gruber, Jakub ; Janoušek, Michal (referee) ; Dundálek, Radim (advisor)
This bachelor thesis is focused on the modern supercharged petrol engines. The intro-duction opens with a brief overview of the European emission standards. The main part of the work deals with the devices reducing car emissions. There are described fuel sys-tems and specific components of a direct fuel injection. A vast part of the work is dedi-cated to the downsizing of the engines and its contribution. I also mentioned the alter-native fuel vehicles.
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Powertrain of experimental single-cylinder spark ignition engine
Laštovica, Karel ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
These bachelor’s thesis deals with experimental single-cylinder engine, calculation of his thermodynamic cycle, design of a piston, design of a can rod eye and his strength check. In introduction there is states function principle of combustion engine and their basic division and application. The bachelor’s thesis consists of five parts: scheduled initiatory parameters, calculation of thermodynamic cycle, calculation of the piston group weight, calculation of forces reacting to piston group and strength check of con rod eye. In the conclusion results of calculation are evaluated.
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Powertrain of experimental single-cylinder spark ignition engine
Číp, Tomáš ; Rauscher, Jaroslav (referee) ; Píštěk, Václav (advisor)
Objective of bachelor’s thesis is, for noted geometric, thermodynamic and operation parameters cylindrical unit of experimental single-cylinder spark ignition engine, perform calculation of thermodynamic cycle, project basic proportion of piston group and for noted operation modes perform strength check of connecting-rod eye. In preamble is stated basic use of spark -ignition engines, their operation principle and basic fisson. The bachelor’s thesis is consists from of calculation, which is continuously described.The calculation is consists from four parts. The first part is calculation of thermodynamic cycle, in the second part are calculated concept piston group, in next part are calculated forces reacting to piston group and fourth part is strength calculation and check of connecting-rod eye. In the last part is results evaluation of calculation.
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Four-cylinder gasoline engine with cylinder deactivation
Steigl, Vladimír ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this diploma thesis is design of configuration and balancing of crankshaft which is determined for four-cylinder gasoline engine. The thesis investigates kinematics, dynamics and possible ways of balancing the inertial forces and moments of the rotating and sliding parts of the central crank mechanism. Subsequently, the 3D CAD model is designed according to the presented drawing. It is transformed into a spare torsion system, from which the calculations of its own and forced torsional vibrations are based. The proposed 3D CAD model is then spatially transmitted in the FEA software Ansys Workbench and modified (boundary conditions, etc.) in the FEA software Ansys Mechanical APDL so that it can be calculated according to the selected LSA method. From the selected results of the LSA method, the crankshaft safety factor against fatigue damage is calculated.
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Crank mechanism of in-line four-cylinder spark ignition engine
Marek, Petr ; Rauscher, Jaroslav (referee) ; Píštěk, Václav (advisor)
Objective of this bachelor’s thesis is for given geometric, thermodynamic and operation parameters cylindrical unit of in-line four-cylinder spark ignition engine perform calculation of thermodynamic cycle, project basic proportion of piston group and for given operation modes perform strength check of connecting-rod eye. In the introduction is described ordinary use of spark ignition engines, several details of history of their evolution and present most widly used construction. Major text of bachelor’s thesis attend to four main chapters: description of thermodynamic cycle, calculation of forces reacting to piston, strength calculation and check of piston pin and of connecting-rod eye. Supplement consists of accomplishment of these calculations and a few of graphs. In the conclusion is evaluation of performed calculations and there are mentioned technological directions of present evolution of gas-engine.
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Combustion Engines with Gasoline Direct Injection
Schulla, Radek ; Řehák, Kamil (referee) ; Dundálek, Radim (advisor)
This bachelor thesis deals with the problematics of direct gasoline injection in petrol engines. It presents basic overview of pollutants from exhaust gases, functions of individual components of fuel system and their development. Next chapter explains the principle of operation, advantages and disadvantages compared to port fuel injection. The last section is focused on use of direct injection in the future.
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HCCI engines
Otáhalík, Pavel ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the problematics of HCCI engines. Due to later required knowledge of fundamental principles, the beginning of the thesis is devoted to the history of combustion engines, the principle of their function and their division by basic criteria. The following section consists of the description of petrol and diesel engines in terms of the principle of the mixture formation and its combustion with emphasis on their advantages and disadvantages. In the central part of the thesis, which focuses on the HCCI engines, various mixtures creation methods and ignition are described. Next, the HCCI engines are described in terms of emissions including current concepts solutions. Finally, the conclusion of the thesis consists of speculation of the future of combustion engines and their prospective alternatives.
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Direct injection systems for spark-ignition engines
Vondráček, Václav ; Rasch, František (referee) ; Drápal, Lubomír (advisor)
This bacheleor´s thesis deals with direct injection of fuel spark-ignition motors. In each chapter you can learn about principle activities injection of fuel, meet single parts and components and learn how these components work. Further, this work compare some constructional differencies of the systems of some automobile producers and observes contemporary general way of those problems with reference to future.
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Heat transfer models for spark-ignition engines
Ptáček, Martin ; Klimeš, Lubomír (referee) ; Štětina, Josef (advisor)
The subject of this diploma thesis is the creation of a spark ignition thermodynamics model using pressure data measured on the actual engine. The model made in Matlab programming language combines Wiebe function for fuel energy release and Woschni correlation for heat transfer between in-cylinder gasses and cylinder walls. The created model contains compression and expansion stroke only, that's why are conditions at the start of compression and total heat addition calculated by measured pressure data from Skoda 1.0 MPI engine. Creation of transparent model by Matlab scripts enables other users to understand the basics of „zero-dimensional“ thermodynamics models properly, which are used by number of commercial solvers such as GT-Power simulation software. First part of this thesis deals with fundamental laws of heat addition and heat transfer, description of equations for its modelling and application. The major section is devoted to Matlab model, where defined input parameters are mentioned, description of model operation and model parameters influence study. Next parts develops issues of combustion pressure measurement and creation of engine simulation by GT-Power software used for comparison with Matlab model. In the thesis conclusion are simulations and actual engine data differences discussed.
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