The relevance of the article is due to the need to replace petroleum fuels with motor fuels obtained from alternative raw materials. Hydrogen is considered as a promising alternative fuel. The use of hydrogen as a motor fuel makes it possible to solve the problem of a cardinal reduction in carbon dioxide emissions into the atmosphere. Using the DIESEL-RK software package, computational studies of the effect of hydrogen supply on the working process of the gas-diesel engine D-245 were carried out. The diesel cycle of the engine and its gas-diesel cycle were calculated with hydrogen supplies equal to 5, 10, 20, 40, 60 and 80% (taking into account the difference in the heat of combustion of the studied fuels). The maximum effective efficiency of a diesel engine is achieved when 40% hydrogen is supplied to the combustion chamber. In this case, compared to operation only on petroleum diesel fuel, the effective efficiency of the diesel engine increased by 7%.

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