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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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Camshaft design for Miller cycle engine
Dúlovcová, Gabriela ; Beran, Martin (referee) ; Svída, David (advisor)
The main aim of this thesis is the analysis of influence of inlet valve opening length and compression ratio on performance and thermodynamic parameters of Miller cycle using GT-SUITE software. Next step was an optimization of inlet and exhaust valve timing with goal of increasing motor effective power. For chosen option was designed cam shaft with regard of kinematic and dynamic magnitude courses.
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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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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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SI engine with Miller cycle turbocharger operation optimization
Novotný, Pavel ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The diploma thesis deals with the calculation of thermodynamic parameters of a turbocharged petrol engine with Miller cycle. A drive unit from Volkswagen, the EA211EVO model line, was chosen as the engine. The engine has a displacement of 1498 cm3 and engine power reaches 110kW at 5000 to 6000 RPM. In this work, a basic description of the thermodynamics of cycles of spark ignition engines is performed, then the problem of turbocharging and methods of its control are presented. The following are the created engine models in GTSuite environment in variants with WasteGate and Variable Turbine Geometry. Finally, operation optimizations with various valve timing changes are presented. The individual variants are the compared.
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Computational Study of the Miller Cycle on a Gasoline Engine with a Turbocharger
Černý, Roman ; Janoušek, Michal (referee) ; Vondrák, Adam (advisor)
The scope of this thesis is the Miller engine cycle analysis and its practical application on a turbocharged spark ignited engine. Based on the sensitivity analysis of the limits affecting the ideal Miller cycle thermal efficiency a thermodynamic model of the engine with a prolonged expansion was set up in the GT-POWER software. The results of the analyses were used to evaluate the feasibility of the reference engine conversion for an operation with Miller cycle.
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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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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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SI engine with Miller cycle turbocharger operation optimization
Novotný, Pavel ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The diploma thesis deals with the calculation of thermodynamic parameters of a turbocharged petrol engine with Miller cycle. A drive unit from Volkswagen, the EA211EVO model line, was chosen as the engine. The engine has a displacement of 1498 cm3 and engine power reaches 110kW at 5000 to 6000 RPM. In this work, a basic description of the thermodynamics of cycles of spark ignition engines is performed, then the problem of turbocharging and methods of its control are presented. The following are the created engine models in GTSuite environment in variants with WasteGate and Variable Turbine Geometry. Finally, operation optimizations with various valve timing changes are presented. The individual variants are the compared.
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