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Methods of reducing the consumption of modern vehicles
Kubeš, Filip ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.
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Vehicle response when using the Start-Stop system
Vaňková, Denisa ; Kohout, Tomáš (referee) ; Jelínek, David (advisor)
The diploma thesis deals with the research of vehicle response in case of using the Start-Stop system in passenger cars with manual and automatic transmission. Values measured using CAN-bus connection of the drivers using Start-Stop system are compared with values from identical vehicles without using the Start-Stop function. A device designed specifically for the purpose of these measurements is used as the control element of the measurements, operating on the basis of a wheel rotating uniformly with the movement of the vehicle and an optical sensor which detects the movement. The measured results are intended to demonstrate the response time of the vehicle using the start-stop function and to determine whether this system has an effect on the starting delay in normal traffic. By using CAN-bus data measurements, detailed start-up graphs are available for all the vehicles studied. The study found that it depends on the type of gearbox used in the vehicle, while with a manual gearbox, Start-Stop does not have a large impact on the flow of traffic in terms of the vehicle's response to the driver. For automatic transmission, it depends on its type, and the differences between individual starts, with the Start-Stop system on and off, differed considerably. The accuracy of the measurement was similar for both measuring devices, but the CAN-bus measurement is more useful, as it is possible to determine the exact course of the start from the obtained data. The manufactured measuring device is easier to operate and the evaluation of the run-up length is done automatically, immediately after the run-up. Based on this work, more extensive research can be carried out in the future, the purpose of which could be to categorize the run-off lengths by individual vehicles, which is particularly important for the purposes of accident analysis.
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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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Methods of reducing the consumption of modern vehicles
Kubeš, Filip ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.
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