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Optimization of turbocharger operation to reduce thermal instability in the exhaust
Kraicinger, Vít ; Ušiak, Michal (referee) ; Böhm, Michael (advisor)
This diploma thesis deals with the reduction of instability of exhaust gas temperatures with the help of optimized turbocharger operation, for the operation of the catalyst in the optimal temperature range. The introduction describes the individual effects on exhaust gas temperatures and the effect of this temperature on emissions. Furthermore, the work describes the turbocharger's function and individual parts, especially the types of regulations used. The 1.5 TSI EA211-EVO drive unit from Volkswagen is selected for the simulations and the optimization itself. Furthermore, the work contains the creation of two models with different turbocharger control (WG, VNT), and their subsequent optimization to approximate the real speed characteristics and adjustment for the possibility of simulations of transient phenomena. At the end of the work, the mentioned optimization of turbocharger operation on the emission WLTP cycle and the subsequent comparison of the reduction of exhaust temperature instability is performed.
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Formula Student cooling system
Krmíček, Antonín ; Böhm, Michael (referee) ; Šebela, Kamil (advisor)
This bachelor thesis deals with cooling system of Formula Student vehicle with electric drive. The Thesis is divided into three main parts. The first part describes reasons and requirements for cooling, the limits of components and methods of their cooling. The next part is focused on analysis of cooling of single-seater Dragon e1, which obtains the inputs to the design part. Design part contains calculations of losses in inverter and electric motors. The parameters of exchangers and assembly of the cooling circuit are determined. The request is that the operating temperatures are not exceeded during the races. By obtaining more accurate inputs to the calculations, the optimal parameters of the proposed components are achieved.
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Cordless drill powered hobby car
Valla, Tomáš ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the design of a cordless drill powered hobby car. The cordless drill must remain usable for normal use. The theoretical part deals with the description of the historical development of childrens’ cars from the first manufactured models to modern pedal and electric carts. The next section describes the origin of cordless drills. The following section shows today's options for purchasing prams. The market has greatly enriched, and it is practically impossible not to choose. The construction part is focused on the design of individual components and a list of purchased parts. It also includes basic calculations for the selected chain and the designed structure.
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Scooter powered by cordless drill
Šimo, Samuel ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
This bachelor thesis analyses the problematics of scooters with additional driving force and new opportunities in usage of unconventional methods of propulsion. The first part describes history and early development of prototypes. Then it reports on current legislative regulations in road traffic. The second part comments on design procedure of cordless drill - powered scooter with detailed description of used components.
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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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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, SCR catalysts and 1D simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of heat transfer through turbine housing with time dependent input values and predicting temperature of exhaust gas flowing through turbine outlet in compliance with NEDC cycle. Result analysis and a suggestion of subsequent actions follow.
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Engines with HCCI mode
Janečková, Radka ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
This bachelor thesis focuses on the ways of realization of engines working in HCCI mode. There are at first described conventional methods of mixture preparation and combustion in spark ignition and compression ignition engines for better classification and understanding. The rest of the thesis is about HCCI engines. These engines are classified into two main categories: gasoline and diesel. There are described several concepts of gasoline and diesel HCCI engines. For each concept there is a basic characteristic and mainly its benefits of emissions and consumption.
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Predicting spark-ignition engine emissions
Jirout, Petr ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
This diploma thesis deals with the possibility of predicting emissions of SI engines. The aim was to create an algorithm for predicting unburned hydrocarbons and carbon monoxide, based on ECU signals. The algorithm is based on practical experiments with SI engines. In the summary, the issues and the possible use of the created algorithm following the incorporation of EU7 are outlined.
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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
Master thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, exhaust gas aftertreatment and heat transfer simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of exhaust gas output temperature and heat transfer through turbine housing. Heat transfer coefficients were calibrated for transient simulation predicting temperature of output exhaust gas in compliance with NEDC cycle. Results analysis and optimization follow, a suggestion on model integration into the virtual turbocharger system is also included.
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Unconventional range extender of an electric vehicle
Vysloužil, Marek ; Böhm, Michael (referee) ; Drápal, Lubomír (advisor)
This master´s thesis is dealing with the research of range extenders with internal combustion engine and the design of gasoline two-cylinder internal combustion engine with an unconventional parallel arrangement of crankshafts that meets mainly the requirements for low noise production and compact installation. It also describes the creation of a thermodynamic model and kinematic design using GT-Power. The computational part focuses on verifying the suitability of the chosen internal combustion engine concept used as range extender using advanced MBS methods.
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