Diplomová práce je zaměřena na výběr pohonné jednotky pro Formuli Student, sestavení spolehlivého výpočtového modelu za využití pokročilého testování. Dále se zaměřuje na přípravu vhodných podmínek pro testování, samotné testování a následnou kalibraci řídicí jednotky pro validaci simulací a také pro efektivní a spolehlivé řízení motoru v náročných závodních podmínkách. Je zároveň součástí komplexního projektu, který se zabývá celkovým vývojem přeplňovaného jednoválcového motoru pro tým TU Brno Racing.

This diploma thesis deals with valve train design of turbocharged engine used in Formula Student category race car. Based on thermodynamic model, a proper valve timing was chosen to achieve maximum power at high engine speed. A kinematic model was used to compute final cam profiles and CAD model was created.

The aim of this thesis is to design Husqvarna FE 501 turbocharged engine piston for Formula Student competition using bioethanol as its fuel. Proposed concept originates in background research on design solutions of modern combustion engine pistons. FEM simulations are used for piston design.

Cylinder speed variations in a combustion engine is an unwanted phenomenon caused by a number of different reasons. Inaccurate fuel delivery from the individual injectors, resonance frequencies in the drive train and faulty sensor readings are some probable causes. There is a need to investigate the potential of different cylinder balancing controllers in a simulation environment before implementing them in the ECU hardware. The thesis is about developing a simulation framework where different controllers can be tested. The framework will generate an engine speed signal based on injected fuel mass to the individual cylinders. A PI controller that makes individual fuel adjustments to the cylinders is implemented in the framework and tested for three different operating points and three different types of disturbances. The results show that the framework is able to generate an accurate engine speed signal based on the commanded fuel amount. Moreover the controller is able to eliminate imbalances caused by error in injected fuel mass as well as specific type of periodic load disturbances in the drive line. Some disturbances cannot be handled by the PI controller, as they lie outside of its controllable region. The simulation framework shows promising results and while further work is needed in some areas, it can work as a foundation for future development and controller evaluation.

Overall losses in swash plate type axial piston machines are mainly defined by three tribological interfaces. These are swash plate/slipper, piston/cylinder and cylinder block/valve plate. Within a research project, funded by the German Research Foundation, a combined approach of experimental research and simulation is chosen to acquire further knowledge on the cylinder block/valve plate contact. The experimental investigations focus on the friction torque within the contact and the measurement of the cylinder block movement in all six degrees of freedom. Simultaneously a simulation model is created focusing on the main physical effects. By considering the results of the experimental investigations significant physical effects for the simulation model are assessed. Within this paper a first comparison between experimental results and the simulation is presented, showing that for a qualitative match the implemented effects (mainly the fluid film, solid body movement, solid body contact, surface deformation) are sufficient to model the general behaviour of theinvestigated pump.

The high price of batteries in working machines with electric drives offer a potential for investment in energy-saving hydraulic systems. The decentralized power network opens up new approaches for hydraulic- and hybrid circuits. In addition, the regeneration of energy can be used at any point of the machine. For the example of an excavator arm drive with a double cylinder two compact hydraulic circuits are presented, which relieve a central hydraulic system.

Generating an adverse pressure gradient (APG), using a rotating cylinder in the proximity of a plane wall under a laminar freestream flow, is studied numerically in this work. The magnitude of the generated APG is a function of the gap, G, between the cylinder and the wall, and the rotational speed of the cylinder, Ω. The flow in such a configuration is characterized by periodic transient vortex shedding at high Reynolds number. A numerical model for the computation of the transient flow for this configuration is developed using the ANSYS CFD simulation tool. The model is validated against published experimental and numerical data for similar flow configurations and excellent agreement is observed. A parametric study is carried out for different combinations of G and Ω for two different Reynolds numbers of 200 and 1000 to examine the development of the resulting separation bubble due to the generated APG. The mechanism of the boundary layer separation over the plane wall and the corresponding wake dynamics is investigated. Results are presented in terms of the distribution of the pressure coefficient as well as skin friction coefficient along the wall and flow patterns around and downstream of the cylinder in the proximity of the wall. The results of these computations confirm that using a rotating cylinder over a plane wall in a freestream flow is an effective technique to generate a controlled range of adverse pressure gradients.

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Ett behov av att förbättra och utveckla dagens kvalitetzon för cylinderhuvud har framkommit för att kunna hänga med i det ökande kravet på kvalitetsutveckling. Dagens zon är både fysiskt krävande för operatörerna samt att den saknar rätt förutsättningar för ett effektivt arbete. Följderna blir utslitna arbetare samt onödigt höga avsyningsmissar som i slutändan skapar kostnader för Scania. Huvudmålet för arbetet har därför varit att lämna ett lösningsförslag på en optimerad layout samt vad för utrustning denna zon ska innehålla. För att skapa en grundförståelse över problemet utfördes en nulägesanalys och stationen observerades för att se hur personalen arbetade. Intervjuer med operatörer hölls då projektprojektgruppen vill höra deras tankar om vad de ansåg om problemet och vad de hade för behov. En benchmarking samt litteraturstudie utfördes vilket gav en bild av hur projektprojektgruppen skulle gå tillväga samt vilka metoder projektgruppen skulle använda sig av. Med hjälp av diverse kvalitetsverktyg kunde olika brister, behov och rotorsaker lokaliseras. En fokusgrupp samordnades mellan relevanta parter för att kunna få feedback på de layout-förslag som presenterades och på så sätt iterera fram den optimala lösningen. Samtidigt pågick ett konstant sökande efter leverantörer som kunde uppfylla det krav som ställdes på den nya utrustningen som behövdes införskaffas. Ett slutgiltigt lösningsförslag med tillhörande implementeringsplan kunde till sist presenteras där bansystemet hade omarbetats samt att hela avsyningen nu skulle ske i en process istället för två med hjälp av de nya rolloverna. Två stationer skulle arbeta rygg mot rygg avgränsade av bullerdämpande väger med utökade belysning och tillhörande endoskop för samtliga stationer. / A need to improve and develop today's cylinder head quality zone has been identified in order to be able to keep up with the ever-increasing demands for quality. Today's zone is both physically demanding for the operators and that it lacks the right conditions for efficient work. The consequences are worn out workers and unnecessarily high utilities who ultimately create costs for Scania. The main objective of the work has therefore been to provide a solution on an optimized layout and what this zone should contain. To provide a basic understanding of the problem, a zero-state analysis was performed and the station was observed to see how the staff worked. Interviews with operators were held when the project team wanted to hear their thoughts about what they considered the problem to be and what they needed. A benchmarking and literature study were also conducted, which gave a better picture of how the project group would go along and what methods would be used. Different deficiencies, needs and rotors could be found using various quality tools. A focus group was coordinated between relevant parties in order to get feedback on the layout proposals presented and thus iterate the optimal solution. At the same time there was a constant search for suppliers who could meet the demands placed on the new equipment that was required to be acquired. Finally, a final solution with its associated implementation plan proposal was presented where the conveyor system had been reworked and that the entire inspection would now take place in one process instead of two thanks to using the new rollover. Two stations would work back to back bounded by noise-damping walls with extended lighting and associated endoscopes for all stations