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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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Modification of a motorcycle spark ignition engine
Poulíček, Matěj ; Ramík, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This diploma thesis is about possible modifications of four-stroke motorcycle petrol engines for increasing power. It also deals with the modification of the Aprilia Leonardo 250 engine from a 2-valve variant to a 4-valve variant, the simulation of this engine and the proposed solution in the GT SUITE. Attention is also paid to the strength control of the crank mechanism of the engine.
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Miller cycle in nonstationary modes
Švanigová, Lenka ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This diploma thesis deals with the assessment of the influence of valve timing, regulation of the lambda coefficient, fuel delivery and ignition advance on the course of the engine torque and the response of the turbocharger during a transient acceleration event of a loaded engine. The model of the investigated VW 1.5 TSI EVO 110 kW gasoline engine with the Miller cycle was created in the GT-Suite program and was used to simulate the transient acceleration event of the loaded engine and evaluate the influence of the mentioned parameters. For the simulated transient, the influence of the turbocharger regulation method was compared, using the wastegate and the variable nozzle turbine.
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Modification of a motorcycle spark ignition engine
Poulíček, Matěj ; Ramík, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This diploma thesis is about possible modifications of four-stroke motorcycle petrol engines for increasing power. It also deals with the modification of the Aprilia Leonardo 250 engine from a 2-valve variant to a 4-valve variant, the simulation of this engine and the proposed solution in the GT SUITE. Attention is also paid to the strength control of the crank mechanism of the engine.
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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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Selected modern trends in internal combustion engines
REJTHAR, Jakub
This bachelor thesis focuses on combustion engines especially on four-stroke spark-ignition engines and their current modern trends such as downsizing, variable valve timing, start-stop system, hybrid and hydrogen drive in the automotive industry. The first part of the thesis is a brief description of the history of combustion engines, their basic distribution and key parts which the engine is designed together with a cooling, electric and suction system from. The second part describes modern trends, their use and subsequent application in passenger cars.
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