Questions of ecology in the area of transport are always very topical because the newest emission standards concerning the piston combustion engines are very hard with regard to protection of the environment and human health. Nowadays the most often used driving units that are applied within the road transport as well as in the marine transport are the diesel engines. In the last period occurred information about a fact that in some of the motorcars was installed a software, which enabled to hide the over-limit values of the nitrogen oxides during the emission testing process. This affair is called "dieselgate". It is a well-known fact that the actual emission limits are very hard and there is arising a serious problem for automobile factories to meet the demanding emission requirements. Therefore it was elaborated an ecological analysis or study concerning the gaseous emissions produced in the road transport. This analysis is based on application of the experimental fuels. As the experimental combustion engine it was chosen just such kind of the motorcar engine, which is relevant to the cause "dieselgate", i.e. the diesel piston combustion engine. The testing fuels were created by mixing of the biodiesel and the ULSDF (Ultra Low Sulphur Diesel Fuel), using various mutual ratios between these fuels. The individual measurements were performed at the various engine loading levels and engine speeds in order to investigate an influence of the experimental fuels on the real operational characteristics of the given testing engine.
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