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Impact of the Instantaneous Weight of Vehicles on their Stopping Distance
Motl, Jakub ; Ptáček,, Petr (referee) ; Vémola, Aleš (advisor)
This diploma thesis is engaged in analysis of braking process of vehicles, especially heavy utility vehicles, with regard to their instantaneous weight. This thesis features survey and division of braking systems and function of brakes including schemes and descriptions. Also there is introduce of some systems improving vehicle properties. Furthermore this work puts mind to possibilities of examination of brakes, measurement of braking distance and braking retardation namely in brake test rooms or by outdoor driving tests including descriptions of particular methods and equipment. There is also mention about legislative requirements for braking distance and braking retardation. The conclusion of this thesis compares numerically predicted braking distance and real braking distance measured for factual vehicle during outdoor driving test
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Simulation model of ABS in passenger car
Svobodová, Jana ; Houfek, Lubomír (referee) ; Grepl, Robert (advisor)
The development of electronics caused revolution the automobile industry. Antilock-Brake-System have become a milestone in the development of electronic security systems. ABS detects susceptibility to locking the wheels, which may occur during braking for critical driving conditions, and then hits. Using of simulation programs is another milestone. Simulation allows repeating of tests and find the best solution of the problem before introduction in practice. Time and development costs are then significantly reduced. In the work is described the most important component of security systems - the braking system and the entire braking process of ABS system. With using a mathematical description of the wheel is in the Matlab-Simulink made quarter model of the vehicle to simulate driving conditions and then created to it a system of ABS. At the end is there an assessment and graphically shown the results of simulations braking.
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Electronic stability systems
Musil, Jan ; Ambróz, Richard (referee) ; Zháňal, Lubor (advisor)
In this Bachelor’s thesis there are basic electronic stability systems described. These systems are mostly used as a precaution in safety of the traffic, but also to ensure comfort of the crew. The main part of the thesis is focused on systems ABS, ASR and ESP. The other parts aim to describe additional systems, which are still in development. In the end there is also view of various individual car companies and possible steps in the future.
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Vehicles for driving schools
Rajnštajn, Jakub ; Rekem, Jakub (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is focused on a description of car adaptations made for driving school needs and the suggestion of another possible upgrades. In the first part, there is described the evolution of common automobiles, especially in spheres important for mentioned potential upgrades. That means the pedal system and active safety technologies above all. Then, there is made a summary of nowadays adaptations, which allow the instructor to control the vehicle during the driving lesson, especially the second pedal controls. Thereafter, there are suggestions of upgrades, which could come with increasing the safety level of the driving lessons. It means especially the possibility to release the brake force from the instructor’s seat, the evolution of additional function of infotainment system and the usage of assistance systems.
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Tractors brake systems
Pazour, Martin ; Prokop, Aleš (referee) ; Ambróz, Richard (advisor)
This Batchelor’s thesis deals with an overview of the contemporary brake system of tractors. Principles and constructions of brake systems will be described in this thetis. Then the braking dynamics will be analyzed and convenient brake system for tractor up to 90kW will be projected.
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Analysis of Non-Standard Braking Intervention into the Brake System
Kortán, Daniel ; Bradáč, Albert (referee) ; Vémola, Aleš (advisor)
This master’s thesis focused on the issue of the possible conversion of liquid brake systems, in the form of replacement of wheel brakes. The first part focused on the function and description of the construction of different types of brakes. The second part is focused on description the types of brake system testing and the regulations regarding brake systems. The last part focused on the measurement of both vehicles and comparison of the results with the calculations.
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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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Vehicles for driving schools
Rajnštajn, Jakub ; Rekem, Jakub (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is focused on a description of car adaptations made for driving school needs and the suggestion of another possible upgrades. In the first part, there is described the evolution of common automobiles, especially in spheres important for mentioned potential upgrades. That means the pedal system and active safety technologies above all. Then, there is made a summary of nowadays adaptations, which allow the instructor to control the vehicle during the driving lesson, especially the second pedal controls. Thereafter, there are suggestions of upgrades, which could come with increasing the safety level of the driving lessons. It means especially the possibility to release the brake force from the instructor’s seat, the evolution of additional function of infotainment system and the usage of assistance systems.
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Hodnocení účinnosti brzdového systému osobního automobilu
Putna, Michal
This work focuses on car braking systems. The theoretical part describes types of brakes used in vehicles, construction parameters of drum and disc brakes. This work also describes the electronic system ABS and possibilities of its braking effects on cylinder and platform braking test rooms. Practical part of this diploma thesis focuses on measuring of the braking forces of Škoda Superb in time. The measurement was performed with both active and inactive systém ABS. The results where compared with the braking results of a Volkswagen Golf Variant. Amount of force and decceleration in time measured were used for results evaluation. Results show that the systém ABS has a significant effect on braking. The length of braking is increased, but the car keeps its maneuverability.
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