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Hydrogen Combustion in Reciprocatin Piston Engines
Forbelský, Antonín ; Svída, David (referee) ; Dundálek, Radim (advisor)
In the thesis I focused on the summary of the facts available concerning hydrogen combustion engines. The work gives a brief history of hydrogen engines. The main part consists of a description of the specifics of the conversion of conventional internal combustion engine into hydrogen engine, and a brief overview of vehicles powered by hydrogen internal combustion engine. In conclusion, the work includes consideration of the future of this technology.
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Powertrain of a modern hybrid vehicles
Novák, Štěpán ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is about the drivetrain in modern hybrid vehicles. It describes the function of a hybrid drivetrain and divides it according to structure, degree of hybridization and placement of the electric motor. It characterizes the design solution of the main components of a hybrid drivetrain. It focuses on the powertrain of selected hybrid vehicles and describes the emissions issue. The conclusion consists of evaluation of the hybrid drivetrain and its vision for the future.
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Alternative Fuel Engines
Bilík, Michal ; Ramík, Pavel (referee) ; Dundálek, Radim (advisor)
This thesis deals with an overview of alternative fuels for road vehicles and their effect on ecology. This work also describes the specific characteristics and peculiarities of power units which run on alternative fuels, their advantages, disadvantages and shows examples of some vehicles.
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Hodnocení výstupních parametrů elektomobilů
Diviš, Ondřej
The diploma thesis is devoted to the evaluation of the output parameters of electric cars. In the first part, they are described in detail individual construction solutions of electric cars and hybrid vehicles. Another section deals with the main advantages and disadvantages of individual construction solutions. Furthermore, they are outlined here possible development directions in the field of electromobility. The practical part of the work deals with the measurement of acceleration depending on time and the course of the increase in speed during acceleration in electric cars and vehicles with an internal combustion engine with an automatic transmission. The results showed that electric cars have better acceleration characteristics than vehicles with combustion engines with automatic transmission. In the case of electric vehicles, a linear increase in speed occurs, whereas in the case of internal combustion engine vehicles, an uneven increase in vehicle speed over time can be observed further during the reassignment of individual gears. As part of the evaluation of driving modes, it was also found that all vehicles achieved the best acceleration characteristics in the "Sport" mode.
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Hybrid and Electric Powertrains of the Trucks
Mrkva, Filip ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This bachelor's thesis deals with current trends in construction of electrified powertrains of trucks. Individual concepts are described and divided according to the arrangement and degree of electrification of the drive. Based on the most actual information from the manufacturers' websites, the parameters of the components used in real vehicles equipped with alternative powertrains are analysed. Real powertrains are evaluated in terms of usability in operation, operating costs, and environmental friendliness. Advantages and disadvantages of hybrid, battery and hydrogen trucks compared to conventional vehicles with internal combustion engines are discussed. Furthermore, the direction in which the discussed branch of the automotive industry will continue to develop is mapped, as well as the most significant obstacles and challenges associated with it. As part of the work, battery cars with an integrated electric axle were evaluated as the most promising for a relatively simple drive design, easy charging, and sufficient range for many applications. Key problems in the developing electric vehicle industry were also pointed out, which are mainly the low energy density of battery and hydrogen cells together with the energy-demanding production of batteries.
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Spark-ignition engine design for hybrid passenger car
Smejkal, Jan ; Dlugoš, Jozef (referee) ; Drápal, Lubomír (advisor)
This diploma thesis deals with design of four-cylinder spark ignition naturally aspirated engine with indirect fuel injection for hybrid passenger cars. The thesis begins with research of engines that meet the requirements of the thesis assignment. The research is followed by design of the engine, where the main components are described in detail. The last part deals with FEA analysis of the connecting rod which is followed by analytical computation of high cycle fatigue by the LSA method.
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Design of hybrid/electric aircraft propulsion system
Dardová, Eva ; Šplíchal, Miroslav (referee) ; Opluštil, Vladimír (advisor)
The diploma thesis deals with the issue of electric and hybrid aircraft propulsion. The first part of the thesis provides a view of the issue from the technological, ecological and legislative point of view. This is followed by a section on research into electric/hybrid drive components and an overview of the component manufacturers. The research section concludes with a market survey of electric/hybrid aircraft in the experimental aircraft, CS-22, CS-LSA and CS-23 categories. This is followed by the actual design of two hybrid and one electric propulsion variants for the CS-LSA category aircraft and evaluation of operational characteristics. Finally, the engine mounting design for the electric variant is outlined.
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Recent trends in electric drive units of passenger vehicles
Drapela, Lukáš ; Fridrichová, Kateřina (referee) ; Böhm, Michael (advisor)
Bachelor’s thesis is focused on providing a comprehensive overview of the current architecture of electric drivetrains for passenger cars with offering specific examples and their critical evaluation. The first part of the thesis aims to describe the function of several different types of electric motors. This thesis continues with a description of the architecture of hybrid vehicles followed by vehicles powered purely by electricity. The final part of the thesis is dedicated to current trends in increasing efficiency and range of electric cars. This part is then supported by a calculation of energy demand of the electric vehicle model for selected comparative parameters using the GT-Suite simulation programme.
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Analysis of connection and disconnection methods of the powertrain components of a hybrid vehicle
Kałuža, Vít Milan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The bachelor thesis deals with component which is used for disconnection or connection of the drivetrain torque of hybrid electric vehicle. This component is used for disconnection or connection of an electric motor which is a part of independent secondary axis also called position P4. There are two clutch principles of this component, one-way ratchet clutch and dog clutch. Theoretical part of this thesis is focused on different concepts of hybrid car. There is also description of drivetrain systems with internal combustion engine and with electric motor. The thesis describes which forms of clutches are used in modern cars. Conceptual design consists of three problem solutions of the one-way clutch deactivation during electric motor toque transmission. The solution with a plate spring has been developed and implemented in order to provide torque limiter function of one-way clutch. In the structural design developed component is placed on the intermediate shaft which transmits torque from electric motor to differential. There has also been performed tooth adjustment of component’s hub to achieve functional concept which protects the one-way clutch from an overload or mechanical damage.
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Hybrid propulsion aircraft
Křivánek, Michal ; Šplíchal, Miroslav (referee) ; Zikmund, Pavel (advisor)
The growing efforts to reduce emissions in aviation may benefit from the use of hybrid propulsion, which is the topic of this bachelor’s thesis. The first section presents an overview of the impact of aviation on the environment as well as further motivation for the use and development of hybrid propulsion systems, due to low battery energy density, currently inadequate for purely electric aircraft use, and both complications and advantages offered by hydrogen used as fuel or in the form of fuel cells. Furthermore, it suggests a possible use of hybrid propulsion in inhabited areas and in both civil and military aviation. An overview of the most commonly used hybrid propulsion configurations follows noting the advantages and disadvantages of each of them. The next section presents an overview of several propeller-driven aircraft projects utilizing hybrid propulsion systems consisting of vertical, extremely short and standard take-off and landing vehicles, followed by a list of selected full-scale propeller-driven demonstrators utilizing hybrid propulsion systems. The final section evaluates the performance of several demonstrators in comparison to their combustion engine counterparts. The most significant advantages of hybrid propulsion aircraft are an increase in range, a substantial decrease in fuel consumption and a decrease in operation cost. However, hybrid propulsion systems also present their disadvantages too, most importantly an increase in vehicle mass and a decrease in number of passengers or amount of cargo. Lastly, the future of hybrid propulsion in aviation is outlined, considering multiple possible scenarios of development.
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