Spark ignition engines in case of biobutanol fuels operation

152 s.sch., gr., tab.CD-ROM s elektronickou verzí prác

High pressure injection of biofuels by the Common Rail fuel system

katedra: KVM; rozsah: 89 s.The subject of the thesis is the creation of a simplified one-dimensional computational model of a Common Rail diesel engine fuel injection system, calibrated with experimental data obtained during operation on diesel fuel. Additionally a simulation of behavior of plant-based biofuel was conducted and results compared to diesel fuel operation.Předmětem práce je vytvoření jednorozměrného, zjednodušeného výpočetního modelu palivového systému Common Rail pro vznětové motory, naladěného podle experimentálně zjištěných dat získaných při provozu na motorovou naftu. Následně byly provedeny simulace provozu na obnovitelná paliva rostlinného původu s porovnáním výsledků s provozem na naftu

Úprava malého zážehového motoru pro provoz na alkoholová paliva

Most of the effort to decrease dependency on fossil fuels is taking place in vehicular applications. There are relatively few studies aimed to investigate possibilities and results of usage of alternative, mainly alcohol-based, fuels in small engines used for propulsion of small garden machinery. The aim of this paper is to investigate the effects of alcohol fuels, n-buthanol and E85, on the operation of small spark ignition engine without any modification and with simple carburetor modification. The test results of an unmodified engine show a remarkable mixture enleanment with increasing alcohol share accompanied by decrease in maximum torque, limitation of stable engine regimes, increased nitrogen oxides production and lowered production of carbon monoxide and hydrocarbons. Simple carburetor modification suppressed all the above mentioned negative impacts and thus allowed combustion of selected alcohol fuels

Regulated and Non-Regulated Emissions from Euro 6 Diesel, Gasoline and CNG Vehicles under Real-World Driving Conditions

The transport sector is one of the main sources air pollutants. Different exhaust after-treatment systems have been implemented over the years to control the emissions of criteria pollutants. However, while reducing the emissions of the target compounds these systems can lead to the emissions of other pollutants and/or greenhouse gases such as NH3 or N2O. Following the implementation of the Real Driving Emissions (RDE) test procedure in the EU, vehicles have been equipped with more complex after-treatment configurations. The impact that these technologies may have on the emissions of non-regulated pollutants during real-world driving have not been evaluated until now. In the current study we present the on-road emissions of a series of non-regulated pollutants, including NH3, N2O, CH4 and HCHO, measured with a portable FTIR from a series of Euro 6d, Euro 6c and Euro 6d-TEMP, gasoline diesel and compressed natural gas (CNG) vehicles during real-world testing. The obtained results show that it is possible to measure N2O, NH3, CH4 and HCHO during on-road operation. The results also highlight the importance of the measurement of the emissions of these pollutants during real-world driving, as the emissions of NH3 (a particulate matter precursor) and those of N2O and CH4 (green-house gases) can be high from some vehicle technologies. NH3 emissions were up to 49 mg/km for gasoline passenger cars, up to 69 mg/km for the CNG light-commercial vehicle and up to 17 mg/km a diesel passenger car equipped with a selective catalytic reduction system (SCR). On the other hand, N2O and CH4 emissions accounted for up to 9.8 g CO2 eqv/km for a diesel passenger car equipped with a combination of diesel oxidation catalysts (DOC), lean NOx traps (LNT), SCR and possibly an ammonia slip catalyst ASC

POWER TAKE-OFF ADJUNCT UNIT FOR STATIONARY ENGINE

katedra: KTS; přílohy: 1 CD ROM, 42 výrobní výkres; rozsah: 68Bachelor thesis deals with engineering design of the power take-off adjunct unit for engine used as stationary power source. This adjunct unit contains the single dry friction disk clutch with lock system. The power take-off systems with description are introduced on the beginning of the work. As a next the engine output, the designed clutch mechanism and the lock system is described and basic strength calculation is elaborated. The thesis besides deals with additional pneumatic control system. The power take-off adjunct unit design documentation is the final result of the project and it is included as supplement.Bakalářská práce se zabývá konstrukčním návrhem nástavby umožňující odběr výkonu z motoru použitého jako stacionární pohonné jednotky. Nástavba zajišťuje vypínání jednodiskové lamelové třecí spojky s aretací ve vypnuté poloze. V práci jsou nejprve uvedeny používané přístupy k odběru výkonu s jejich popisem. Dále je popsána výstupní část motoru, navržené vypínání spojky a jeho aretace a provedeny základní pevnostní výpočty. Projekčně se práce zabývá pneumatickým vypínáním spojky. Cílem práce bylo zhotovení výkresové dokumentace nástavby umožňující odběr výkonu z motoru, která je obsažena v přílohách