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Systém ABS jako prvek aktivní bezpečnosti vozidla
Tvarůžek, Jiří
The thesis is focused on the issue of the ABS system, which is used for passenger vehicles. The first part of the work describes active safety elements that are used to eliminate and prevent traffic accidents. This group includes the ABS system, which is devoted to the second part of the literary research. It describes the operation of the system, the individual components of which the system is composed and its historical development. The second part of the work is focused on experimental measurements that assess the effect of ABS system activity on the braking distance of the vehicle at different road surface conditions. Results from laboratory measurements of ABS system activity are also processed in the work. The results show that, thanks to the active activities of the ABS system, it is possible to achieve a shorter braking distance even with different road surface conditions.
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Selected Issues of Motorcyclist's Behavior
Sedláček, Jan ; Bradáč, Albert (referee) ; Semela, Marek (advisor)
This thesis focuses on the braking systems of modern motorcycles. It describes the design details mainly concerning braking systems, ABS, semi-active chassis, but also the MSC stability control system. The experimental part deals with the measurement, analysis of the braking decelerations of motorcycles and evaluation, among others, whether the ABS system reduces the braking distance on dry road. Nine motorcycles were used to measure this issue. All models tested had ABS or the newer ABS system with built-in MSC stability control. Braking progress was analysed from initial speeds of 50 and 70 km/h to a straight-line stop with ABS applied and with ABS deactivated. The results were plotted graphically and can be used to provide information about the actions of the rider and the motorcycle itself. Braking distances, MFDD, initial speeds were calculated. In this study, the video recordings of braking are analyzed and compared with the measured data. The data can be useful for the analysis of single-track vehicle accidents.
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Influence of heavy vehicle load to the vehicle deceleration
Jirásková, Iveta ; Tylšar, Vladimír (referee) ; Bradáč, Albert (advisor)
The diploma thesis deals with the issue of braking trucks at different loads. The theoretical part defines the basic construction of trucks, truck brakes, the braking process and the factors that affect braking, braking deceleration, and legislative requirements for truck brakes. The practical part describes the course of experimental measurements, the use of the technique, the place of measurement, atmospheric conditions and used trucks. At the end of the work, based on experimental measurements, the obtained values of braking deceleration of trucks are evaluated.
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Vliv stavu pneumatik a tlaku huštění na brzdnou dráhu vozidla
Kotík, Milan
This thesis is aimed for rating condition of used tires and pressure in the tires and final results of breaking mechanism and mainly breaking distance. In the theory part is an explenation how the breaking process works. Other things this thesis is about are factors which affects breaking distance and most advanced electronic breaking systems. The end of the teoretical part is aimed for possibility of determinating breaking distance in offroad conditions, and also specialized testing rooms. Goal of practical part is to measure in laboratory conditions on vehicle with following results of breaking distance on booth sets of tires with different depth of the pattern and pressure in tires.
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Analýza brzdových systémů motorových vozidel
Janák, Josef
Bachelor thesis deals with problems of motor vehicle braking systems and systems associated to them. The introduction deals with the division of brake systems and sys-tems according to various criteria. It continues with the composition and main parts of hydraulic brakes up to the main content of this work, namely the design and function of drum and disc brake systems. Then it follows a with a little description of the electro-hydraulic braking system and the end part of the thesis is focused with the anti-lock and stabilization systems associated with the brake system of the car and the length of the braking distance.
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ESP/ESC Impact to Behavior of Vehicle
Weigel, Filip ; Mrázek, Vojtěch (referee) ; Strnadel, Josef (advisor)
This bachelor thesis focuses on active safety - ESP. System ESP greatly improves stability of vehicle while turning. The thesis analyses modelling, brake functionality, subordinate systems of ESP - ABS and ASR, physical forces and phenomenons, model example, analysis of problem, design of model, implementation of model and experiments evaluation of implemented model in UPPAAL enviroment. The goal of the thesis is to prove that ESP system helps to stabilize vehicle while turning by simulation of vehicle model. Results are presented in well-aranged graphs side-by-side. It is possible to analyze the behaviour of vehicle while turning with ESP or without ESP.
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ABS Impact to Behavior of Vehicle
Zich, Jakub ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
The bachelor thesis discusses the Anti-lock braking system and its impact on braking distance of a vehicle. The thesis contains research of this problem, a summary of suitable modeling tools, solution draft, its implementation in the UPPAAL modeling tool and tests performed with the model. The tests examine the course of progression of basic quantities associated with braking (velocity, braking distance, slip, angular velocity, friction coefficient) in simulations of emergency braking with and without the use of ABS, and compare the results. They also verify probability of the vehicle stopping in different circumstances on given distance. Lastly, the model can simulate brake or sensor defect, and results of those simulations can be compared to simulations without defect.
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Modelling and Analysis of Impacts of ABS to Behavior of Vehicle
Holec, Dominik ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Bachelor thesis discusses the ABS braking system and its influence on the braking distance of the vehicle. The thesis includes design, description of the development and testing of the model in the UPPAAL verification environment. The resulting model is a system of intercommunicating timed automata. The analysis of the model properties is based on the method of statistical verification. The model allows us to investigate in particular the course and the length of the braking track. Other variables affecting the behavior of the model that can be tracked are skidding, friction coefficient, air resistance, braking force and vehicle speed. It is also possible to obtain the probability of the vehicle stopping within a certain distance under the chosen conditions and examine the impact of ABS on these results.
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