Reduction of Fuel Consumption in 12ЧН15/18-Type Diesel Engine by Regulating Cooling System

Many countries exploit a large number of armored vehicles, developed and manufactured dozens of years ago. Due to this there is a necessity of its continuous modernization. An object of the research is an internal combustion engine for a ground armored vehicle with a 12ЧН15/18 diesel engine. Calculation of engine thermal balance components is based on an engine external speed characteristic. An analysis of thermal balance for a 12ЧН15/18-type diesel engine of a ground armored vehicles has been made with separation according to: heat being withdrawn from cooling system liquid to environment; oil of lubrication system in the internal combustion engine; efficiently used heat; heat being withdrawn along with exhausted gases; residual portion of heat. The paper presents characteristics on changes in heat release during loading modes of the diesel engine operation and also shows an influence of the diesel loading on amount of heat withdrawn by cooling water and oil of diesel lubrication system. Two versions of the cooling system are considered in the paper, namely: with regulation and without regulation. The paper contains description of evaluation pertaining to an influence of a regulating system on characteristics of the diesel cooling system, parameters of efficient power and specific and efficient consumption of fuel. The necessity has been proved to modernize a regular fan cooling system of the armored vehicle with the 12ЧН15/18-type diesel engine. An influence of an average cooling liquid and diesel oil temperature with loading modes of 60 and 80 % on the efficient power of a power unit with a fan-type cooling system has been investigated in the paper. It has been determined that an increase in average temperatures of cooling liquid and oil for the 12ЧН15/18-type diesel makes it possible to improve economy and power of the diesel engine.

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