Kuzmenko A. Improvement of characteristics of light-duty gas engine with spark ignition by choosing parameters which determine combustion process

Process of combustion of the small-displacement gas drive with spark ignition 4ГЧ7,5/7,35. Heightening of economic and ecological indexes of the small-displacement gas drive with spark ignition at the expense of a choice of constructive and adjusting parameters which more all influences combustion process. In the fundamentals of dissertational research are put fundamental positions of theories of thin-walled piston engine, burning, heat exchange, in particular are used : a method of mathematical simulation of process of combustion, methods of classical thermodynamics, Newton-Rihmana method, methods of an experimental research of the gas drive. The program of calculation of process of combustion on dual-zonal model which allows to raise exactitude of calculation of parameters of a working body is developed, and to define conditions of origin of a detonation in not burnt down zone and to calculate contents of toxic substances in the completed gases of the burnt down zone. Influence of parameters of process of combustion on economic and ecological indexes of small-displacement gas drives with spark ignition is defined. Characteristic maps of feeding of fuel, an advancing of ignition, position throttle partition for an engine management microsystem 4ГЧ7,5/7,35 are created. The dual-zonal mathematical model of calculation of parameters of a working body in the cylinder which differs new dependences for definition of surfaces heat springback which do not require the account of geometry of the chamber of combustion, and also by new, more exact dependences for calculation of indexes of character and duration of combustion of I.I.Vibe is offered. For the first time on the basis of settlement criterion of a detonation for the small-displacement gas drive degree of compression which allows to raise economic indexes of the drive is selected and justified. The new method of optimization of the basic adjusting parameters which differs the account of a full range of operating duties of the small-displacement gas drive at realization of a readable cycle of the car is offered. Results of researches are transmitted for use in KhRP "AvtoZAZ-motor" (Melitopol) and are introduced in КP KhКBD, research and development laboratory of chair DVS HNADU, and also used in educational process by preparation of students of a speciality 7.05050304, 8.05050304 - explosion engines in HNADU. Engine building.