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Over-expanded internal-combustion engines
Novotný, Pavel ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
At the beginning there is a short history of over-expanded engines. Subsequently, the thermodynamics of ideal over-expanded cycles are analysed and compared with the ideal Otto cycle. The thesis also deals with some design solutions for achieving over-expansion in an internal combustion engine. In the thesis there are also selected over-expanded engines from leading world carmakers. At the end the thesis deals with systems with variable compression ratio.
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Spark ignition piston engine with an extended expansion
Koštuřík, Vojtěch ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This thesis deals with the design of a spark-ignition internal combustion engine with extended expansion. It explains the principle of extended expansion using the Atkinson or Miller cycle and the possibilities of achieving it. In addition, a design study and engine cycle is carried out. Subsequently, the course of the kinematic quantities and forces in the mechanism is determined. At the end, the strength analysis of the connecting rod of the designed mechanism is performed.
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Mechanism of a one-cylinder diesel engine with elongated expansion
Filipi, Jaroslav ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The diploma thesis deals with mechanism of combustion motor that enables greater expansion ratio then compression ratio. The main advantage of motor mechanism is verified in thesis, which is greater thermal efficiency then compared to conventional diesel motor. Additionally, there are investigation of kinematic variables, force of gas pressure and inertia forces, which operates in different bindings mechanism. The last part deals witch strength of selected parts of the proposed mechanism.
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Thermodynamic of Atkinson and Miller cycle
Böhm, Michael ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
In the bachelor thesis is performed a basic thermodynamic analysis of combustion engines cycles. For every cycle there is also a design for a real combustion engine. Subsequently, the Atkinson and Miller cycles are compared to the ideal Otto cycle with supercharger and without it in terms of thermal efficiency for the same input parameters. The results are evaluated and the use of the Atkinson and Miller cycle in motor vehicles is explained. Next, there are specific car representatives, which use these cycles and the development trends of modern cars.
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Thermodynamics of ideal cycles of IC engines in Matlab
Pavlíček, David ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
Key aspect of this thesis is toolbox, which contains functions for calculate ideal combustion engine cycles. Thesis is divided into four parts. In the first part is briefly described history. The first chapter contains description of real combustion engine types. In the second part, which is covered by the second chapter, is located thermodynamic view. Third part is whole about MATLAB. From historical introduction through description of individual functions to example how toolbox can be used. In the last part is comparison of real combustion engine cycle with ideal one, which has been created by toolbox.
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Comparison of traditional and nontraditional cycles of heat engines
Dobiáš, Ladislav ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The bachelor thesis describes the thermodynamic cycles of four-stroke spark ignition (SI) and compression ignition (CI) engine, Wankel engine and two-stroke spark ignition (SI) engine. Based on the information is compared with thermal efficiency of each engines with four-stroke spark ignition engine in the T-S diagrams. There were also dedicated to Atkinson cycle and its use in practice. The last part deals with the construction of a variable compression ratio used in the development of modern engines.
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Increasing the efficiency of modern internal combustion engines
Kuzmin, Aleksei ; Böhm, Michael (referee) ; Beran, Martin (advisor)
This bachelor's thesis deals with the issue of increasing the efficiency of internal combustion engines, which is of significant importance nowadays due to the popularity of personal cars. The given problem is closely related to the reduction of fuel consumption during the operation of the above-mentioned machines and the great pressure of emission standards. The global climate change of our planet and the great impact on human health caused by the amount of harmful emissions of exhaust gases, which are motivations for further research in the given area. For solving a specific issue was chosen a research method, which consists of using quality information sources and professional scientific articles. The basic procedures in the elaboration of this bachelor's thesis have the following character: a brief historical overview of the development of internal combustion engines, theory in the context of the issue and definition of the necessary quantities, comparison according to basic parameters (efficiency, principle of work, emissions, specific effective fuel consumption) of three current methods of solution (millerization, Atkinson cycle, variable compression ratio), discussion of achieved results, drawing of important conclusions. The conclusion of the thesis is the evaluation of the advantages and disadvantages of the chosen solutions to the given problem, the potential of using and the assumption of the future of internal combustion engines.
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Vývoj a koncepce 5 - taktních spalovacích motorů
LIŠKA, Radek
This work deals with theory of four stroke internal combustion engine and with the concept of five stroke combustion engine. Describes working strokes of four stroke engine. Work is focused also on another variants of modern vehicle drives like electric motors and hybrids. Engines with longer expansion stroke, which includes Atkinson cycle and cycle invented by Ralph Miller and in particular the five-stroke engine, which parameters is compared with classical ICE. The final result of this work is creation of fives stroke engine model of own construction.
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Over-expanded internal-combustion engines
Novotný, Pavel ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
At the beginning there is a short history of over-expanded engines. Subsequently, the thermodynamics of ideal over-expanded cycles are analysed and compared with the ideal Otto cycle. The thesis also deals with some design solutions for achieving over-expansion in an internal combustion engine. In the thesis there are also selected over-expanded engines from leading world carmakers. At the end the thesis deals with systems with variable compression ratio.
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Spark ignition piston engine with an extended expansion
Koštuřík, Vojtěch ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This thesis deals with the design of a spark-ignition internal combustion engine with extended expansion. It explains the principle of extended expansion using the Atkinson or Miller cycle and the possibilities of achieving it. In addition, a design study and engine cycle is carried out. Subsequently, the course of the kinematic quantities and forces in the mechanism is determined. At the end, the strength analysis of the connecting rod of the designed mechanism is performed.
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