Abstract
In the work, there was carried out a physical and chemical analysis of alternative fuels, from which there was selected dimethyl alcohol. A number of theoretical calculations were carried out to evaluate the main properties of the mixed fuel and the effect of the addition of dimethyl ether on the performance of the diesel engine. For a more complete assessment of the effect of mixed fuel on engine performance, there were used regression modeling methods. The regression coefficients were calculated on a PC using the MATLAB application software package. Theoretical calculations and mathematical modeling have shown that the addition of 30% dimethyl ether to diesel fuel is the most effective part of the mixture to reduce the environmental performance of diesel engines.