The article displays advantages of using multicomponent mixed biofuels for diesel engines, i.e. mixtures of oil diesel fuel and rapeseed oil, rapeseed oil methyl ester, gasoline. The results of experimental research on a D-245.12C type automotive diesel engine running on these fuels are presented. A method of determining the optimal composition of multicomponent biofuels is proposed. Using this method optimization calculations of the fuel compositions are made. It is demonstrated that among tested biofuels the mixture of 80% oil diesel fuel, 10% of rapeseed oil and 10% of gasoline possesses the superior ecological parameters.

The depletion of oil fields and the deteriorating environmental situation leads to the need for the search of new alternative sources of energy. Actuality of the article due to the need for greater use of the alternative fuels in internal combustion engines is necessary. Fuels produced from vegetable oils and animal fats as advanced alternative fuels for diesel engines are considered. These fuels are produced from renewable raw materials and are characterized by good environmental qualities. Advantages of using fuels of vegetable origin as motor fuels are shown. Experimental research of diesel engine D-245.12S functioning on mixtures of diesel fuel and mustard oil of various percentage is given. One of the most wide spread vegetable oils in Russia is mustard oil. Possible ways of using mustard oil as fuel for a diesel engine are considered. An opportunity of improving characteristics of exhaust gases toxicity by using these mixtures as a fuel for automobile and tractor diesel engines is demonstrated.