Diploma thesis describes current fuels for gasoline engines in theoretical part. It de-scribes conventional fuels: gasoline, gaseous biofuels and liquid biofuels. This section talks about: familiarization with manufacturing, raw materials for production with their pros and cons. Fuels are comparing with one another in the tables. In a separate chapter is more about biofuel ethanol, which were measured in the practical part. The practical part describes the motor testing, dynamometer and engine on which measurements were made. On the engine we compared the effects of fuel (N95, E70 and E32) to power and torque, fuel consumption, exhaust gas temperature, engine effi-ciency and the energy supplied in the fuel. The results of monitored parameters are listed in tables and compared in graphs. The results show that ethanol has a positive effect on performance and engine torque. The negative impact of ethanol in the fuel is increased fuel consumption.

The theoretical part of the diploma thesis with the topic "Effect of bio-component on the automotive gasoline properties" contains a summary of basic fuels for spark ignition engines, their basic properties, and the legislative requirements. This part also deals with the theory of measurement of density, viscosity and shear stress. In the experimental part of thesis are described the measurement of the physical and mechanical properties of petrol, buthanol and their blend sand determination of their temperature dependences. The results are presented in the tables and are shown in the charts. Obtained results are discussed with the thematic scientific contributions.

This Ph.D. thesis titled "Analysis of changes of engines output parameters at combustion of E85 fuel" describes the history and present use of bioethanol as a fuel for spark-ignition engines, as well as possibilities of its production and use in internal combustion engines. The comparison of the physico-chemical properties of the bioethanol and gasoline is also the part of the thesis. The experimental part is focused on the evaluation of engines basic parameters and emissions production. Engine and two vehicles were chosen to analyze the influence of E85 to change parameters mentioned above. Engines were originally designed to operate on gasoline. Hence, one of objectives of this thesis is to describe adjustment of the engine (originally designed for the combustion of gasoline) for operation on E85. The results of experimental measurements show that E85 fuel has a positive impact not only on the performance parameters of the engine, but also on the production of emissions. However, due to different properties of ethanol and gasoline is necessary increase amount of injected fuel. It leads to a negative impact on the fuel consumption of the engine.

This submitted dissertation work deals with fuel consumption measurements at buses. It describes variety of driving cycles, basic calculative corrections, setting-up driving tolerances and application range. Special focus is paid to agreement of UITP-SORT procedures. The experimental part of dissertation work explains credibility of measurements, especially concerns traffic delay at measurement and describes additional corrections under different weather conditions. We compared results from fuel measurement device with readings from CAN messages, provided by engine control unit. Specific part is devoted to measuring influence of different auxiliary devices, like air compressor, servo steering, air condition, ventilation or cooling fan and influence of electrical load at vehicle systems. There is also is discussed an influence of driving style of specific drivers and autopilot.

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This thesis introduces and describes a fuel for internal combustion engines. The first part is devoted to a description of the distribution of alternative fuels for road vehicles, pays attention to fuels of biological origin-biofuels. In the second part deals with the problems of exhaust emissions analyze in detail the individual substances and their impact on humans and the environment. The next section describes the vehicle, vehicle test and measuring equipment. Custom work represents the single measurement vehicles Subaru Outback, which is to identify the parameters of the vehicle on two different fuels and their comparison

The thesis deals with internal combustion engines (ICE) that are able to burn more types of fuels. The issue is being presented not only from the technical and functional solution point of view, but also with regard to its legislative, economical, ecological and safety demands. Ethanol detection methods in ethanol-gasoline blend, their advantages and disadvantages concerning the above mentioned viewpoints are being presented in this thesis. Furthermore, a new method of ethanol in fuel mixture detection, which has not been known to us before, is being introduced. This method is based on fuel mixture refraction index measurement and is described in detail in this thesis. The method was verified by experiments carried out on commercially available fuel blends in the Czech market. The experimental part of this thesis also includes the design of ICE driving algorithms using this fuel detection method. Correctness of the designed algorithms has been verified by measuring on the engine dynamometer. The results of the thesis show that the designed flex-fuel system solution works well and is even more reliable than contemporary systems usually used.

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