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Comparison of Hybrid Powertrain Topologies in Daily Commuting Regime
Ušiak, Michal ; Štětina, Josef (referee) ; Vondrák, Adam (advisor)
The master’s thesis deals with modelling of various architectures of hybrid powertrains for three vehicle sizes in GT-SUITE and compares them in daily commuting operating mode. On top of making of the hybrid vehicle simulation models, control algorithms had to be created to manage the energy split between the internal combustion engine and the electric motor for each of the architectures. Routes to work and back were logged using the GPS and postprocessed to obtain the speed and the road grade profiles. Resulting data was used as an input in simulations of daily commuting. To compare all hybrid powertrain architectures, fuel economy and electricity consumption were evaluated for WLTP and daily commuting operating modes. Finally, the environmental impact of each topology was assessed based on an estimation of corresponding well-to-wheel emissions.
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The electric car as part of a smart home
Peichl, Ondřej ; Ušiak, Michal (referee) ; Štětina, Josef (advisor)
This thesis provides an overview of technologies that can be a part of an electric car. These technologies include Vehicle to Grid, Vehicle to Building, Vehicle to Home, etc. The principle, properties, possibilities of development and integration in the Czech Republic and in the world will be described for these technologies. The second part of the thesis will deal with the connection of an electric car to a smart home and its cooperation with other components of the smart home, such as home photovoltaic power plant, control system or wallbox. At the end of the thesis is designed a specific smart house, which was calculated the consumption of electricity for the household, for the electric car and also how much of this consumption can cover the home photovoltaic power plant.
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Comparison of life-cycle emission produced by cars
Plott, Patrik ; Ušiak, Michal (referee) ; Fridrichová, Kateřina (advisor)
This bachelor´s thesis of research nature deals with comparison of emissions of individual types of passenger car´s powertrains in terms of their entire life cycle. The goal was to describe current emission regulations of passenger vehicles, various types of power units they use, and emissions that are created in manufacturing, using and disposal of these vehicles. The comparison includes not only different types of internal combustion engine vehicles, but also electric vehicles. In conclusion were these power units evaluated based on emission considering current situation.
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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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Turbocharger Performance Measurement
Ušiak, Michal ; Janoušek, Michal (referee) ; Vondrák, Adam (advisor)
The bachelor’s thesis deals with recent methods of measuring turbocharger characteristics. Besides an introduction to fundamental performance characteristics, such as compressor map and turbine map, thesis contains description of experimental methods of collecting such data, which is essential for designing a turbocharged power unit. Description of main parts of the test stands and limitations consequent upon the measuring methods is supposed to offer basic knowledge of turbocharger design validation to the reader. As an extension overview of tests increasing accuracy of these characteristics and a few additional and safety tests is presented. Examples of use of these characteristics in engineering calculations should give an image of significance of creating computational model from experimental collected data, which describes thermodynamics of the turbocharger.
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Alternative fuels for SI engines
Balažovič, Lukáš ; Ušiak, Michal (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the topic of alternative fuels for petrol engines. The first is a brief introduction to the issue of petrol engines, followed by a description of each alternative fuel. The thesis summarizes the most important information and comparison of alternatives with conventional gasoline is made. Each fuel is evaluated in terms of advantages, disadvantages, and position on the market.
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Battery thermal unit design
Raclavský, Martin ; Ušiak, Michal (referee) ; Šebela, Kamil (advisor)
This bachelor's thesis brings knowledge about the testing of battery cells and provides a particular design of a tempering unit for monitoring the effect of temperature on their parameters. The work can be divided into two parts. The first research part is focused on the theoretical foundations that deal with testing the parameters of battery cells and the effect of temperature on their operation. The research provides a deeper understanding of the relationship between temperature and the performance, capacity, lifetime and safety of battery cells. In the second part, based on the knowledge gained, the design of a thermal conditioning unit is carried out, which serves to provide a temperature-stable simulated environment for monitoring the effect of temperature on the tested cells. The design includes a chamber, a thermal block for temperature regulation, a method of cooling and heating, and suitable wiring. Heat losses were calculated, the required heat output was determined, and possible modifications to the unit were discussed.
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LiveScript to solve longitudinal vehicle dynamics
Tuharský, Erik ; Ušiak, Michal (referee) ; Štětina, Josef (advisor)
This bachelor’s thesis focuses on describing the running resistances (rolling, aerodynamic, climbing resistance and resistance to acceleration) and their effect on the longitudinal dynamics of vehicles. The running resistances are then calculated using a MATLAB programme. The time to reach 100 km/h and the distance to stop from a 100 km/h are also calculated. The conclusion then concentrates on comparing the results of the calculations and data obtained on a test using an available vehicle.
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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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Comparison of life-cycle emission produced by cars
Plott, Patrik ; Ušiak, Michal (referee) ; Fridrichová, Kateřina (advisor)
This bachelor´s thesis of research nature deals with comparison of emissions of individual types of passenger car´s powertrains in terms of their entire life cycle. The goal was to describe current emission regulations of passenger vehicles, various types of power units they use, and emissions that are created in manufacturing, using and disposal of these vehicles. The comparison includes not only different types of internal combustion engine vehicles, but also electric vehicles. In conclusion were these power units evaluated based on emission considering current situation.
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