**4. Conclusions**

The main task of this scientific-research work was to fill gaps within the current knowledge base concerning influence of bio-component fuels on production of the gaseous emissions. All the tests were performed using a 6-liter auxiliary diesel engine, which is usually installed in the marine ships. Various testing fuels were created by mixing of the biodiesel with the ULSDF. The applied mixing ratios were as follows: 0%, 30%, 70%, 100%, whereby the fuel mixtures were marked in the following order: B0: U100, B30: U70, B70: U30, B100: U0. Thus, the first tested fuel was the pure ULSDF (B0: U100) and the last tested fuel was the pure biodiesel (B100: U0). The individual experiments were performed using the engine speed values 1000 rpm or 1500 rpm and at the engine loading levels from interval between 30% and 90%. The obtained results can be summarized as follows:


**Author Contributions:** Conceptualization, M.P. and M.K. (Melichar Kopas); methodology, M.P. and M.K. (Melichar Kopas); software, M.P. and M.K. (Melichar Kopas); validation, M.P. and D.S.; formal analysis, , M.P. and D.S.; investigation, , M.P. and M.K. (Marek Kliment); resources, M.P. and M.K. (Marek Kliment); writing—original draft preparation, M.P. and M.Š.; writing—review and editing, M.P. and M.Š. All authors have read and agreed to the published version of the manuscript.

*J. Mar. Sci. Eng.* **2020**, *8*, 330

**Funding:** This work was supported by the Slovak Research and Development Agency under the contract No. APVV-16-0259. The article was written in the framework of Grant Projects: APVV-16-0259 "Research and development of combustion technology based on controlled homogenous charge compression ignition in order to reduce nitrogen oxide emissions of motor vehicles", VEGA 1/0473/17 "Research and development of technology for homogeneous charge self-ignition using compression in order to increase engine efficiency and to reduce vehicle emissions", and KEGA 006TUKE-4/2020 "Implementation of Knowledge from Research Focused on Reduction of Motor Vehicle Emissions into the Educational Process".

**Conflicts of Interest:** The authors declare no conflict of interest.
