INFLUENCE OF BIO FUELS ON POLLUTANT EMISSIONS OF DIESEL ENGINES

Introducing fuels from renewable energy sources in form of blends or pure fuels has its purpose in the tendency of saving conventional energy sources and reduction of global CO2 emission. However, in dependence of kind of renewable energy source the fuels are obtained, it is to expect differences in pollutant emissions in reference to conventional fuels. Common theoretical considerations are also pointing out the potential of fuels from renewable energy sources to reduce regulated pollutant emissions. The use of biodiesel, as a fuel from renewable energy source, for reducing regulated pollutant emissions in IC diesel engines for heavy duty vehicles is considered in the paper. The applied test procedures comply with the requirements of the European standards for IC diesel engines that are obligatory during homologation approval, so called European Stationary Cycle. On the basis of test results and corresponding calculations of pollutant emissions for both bio and conventional fuel use in the IC engine with the same adjustment parameters are shown. With appropriate argumentation, the importance of engine parameter optimization, at first the fuel injection angle in dependence of kind of used fuels is pointed out.