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Variable compression ratio for spark-ignition four-cylinder engine
Rada, Jan ; Fridrichová, Kateřina (referee) ; Drápal, Lubomír (advisor)
The automotive industry faces pressure to increase engine efficiency and reduce emissions. One promising solution is the implementation of variable compression ratio technology, which allows for the dynamic adjustment of the engine's compression ratio according to operating conditions, thereby improving efficiency, saving fuel, and reducing emissions. This thesis focuses on the analysis and design of a four-cylinder spark-ignition engine with variable compression ratio technology. The work compares the baseline engine with the modified engine in terms of installation space and weight, incorporating theoretical foundations of variable compression ratio and practical aspects of its implementation. The introductory part includes a literature review on variable compression ratio engines, followed by the conceptual design of the engine and an analysis of the crank mechanism. The main part of the thesis is the design, which aims to maximize the use of components from the original engine. The resulting kinematic and force analyses support the potential of this technology for developing more efficient engines.
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Unconventional Supercharging
Horák, Tomáš ; Píštěk, Václav (referee) ; Dundálek, Radim (advisor)
This Bachelor thesis summarizes the various unconventional ways of improving the performance of combustion engines. This thesis descripts historical, currently used and prototype metods used for this purpose, including the principle of their function. Great emphasis is placed mainly on forced induction engines, since this area is experiencing very rapid development.
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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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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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Unconventional Supercharging
Horák, Tomáš ; Píštěk, Václav (referee) ; Dundálek, Radim (advisor)
This Bachelor thesis summarizes the various unconventional ways of improving the performance of combustion engines. This thesis descripts historical, currently used and prototype metods used for this purpose, including the principle of their function. Great emphasis is placed mainly on forced induction engines, since this area is experiencing very rapid development.
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