Klymenko O. Evaluation of the pistons temperature state regulation impact on the diesel engine technical and economic performances

Working process of a diesel engine because of its thermal state. Determination of the effect of temperature on the state regulation of the pistons complex technical and economic performance of diesel engines according to the operating model. Experimental Methods used to determine the toxicity of exhaust gases and fuel efficiency of a diesel engine, the temperature of parts of its state of the combustion chamber. In the simulation, the temperature condition of pistons used the finite element method. Predicting resource strength of the piston is made of methods to assess on the basis of the joint account of the impact of its material damage caused by fatigue and creep. The estimated equation for determining the technical and economic performance of the internal combustion engine obtained by treating the experimental data using the least squares method. The problem of optimizing the control parameters in the regulation of the temperature state of the pistons solved using generalized function desirability Harrington. Empirical dependence for determining the emission of NOx and smoke exhaust gas of a diesel engine 4CHN12 / 14 on the engine speed, load, piston cooling mode and the values of the angle of fuel injection timing; obtained results of the evaluation of technical and economic indicators of diesel engines for various purposes through the use of the theory of fuzzy logic for each load mode, offered psycho-physical scale for the assessment of indicators of toxicity of exhaust gases, fuel efficiency and reliability of diesel engines; received an assessment of the resource strength of the piston to force the different operating models and levels of diesel 4CHN12 / 14, taking into account the methods of temperature regulation condition of pistons and temperature limits in other critical areas of the piston. For the first time evaluated the effectiveness of the temperature control on the state of the piston combined effect on performance exhaust emissions, fuel efficiency and resource durability of pistons in accounting manual diesel models; the first time for an integrated medium operating improve fuel consumption and mass emissions of nitrogen oxides and particulate matter from the exhaust gases of diesel detected feasibility of cooling the piston loaded on separate operating modes; the first time that a comprehensive improvement medium operating indicators of fuel consumption and mass emissions of nitrogen oxides and particulate matter from the exhaust gas of a diesel engine in the regulation of temperature state requires pistons control the angle of fuel injection timing. The results are implemented and used in the GP "Kharkov Design Bureau of engines" (Kharkov), as well as in the practice of scientific research and in the teaching process of the department of internal combustion engines NTU "KPI". Engine building.