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2 Acta Mechanica et Automatica

2 2020

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Modelling of the low-pressure gas injector operation

Szpica Dariusz, Kusznier Michał

Acta Mechanica et Automatica

2020

Vol. 14, no. 1

29--35

In recent years, there has been a growing interest in alternative sources of power supply for internal combustion engines. Lique-fied petroleum gas injection systems are among the most popular. It becomes necessary to know mathematical descriptions of the opera-tion of individual components. The article presents a mathematical model that describes the operation of the low-pressure gas injector. Valtek plunger injector was chosen as the test object. The mathematical description includes three parts, i.e. electric, mechanical and pneumatic. The electrical part describes the generation of electromagnetic force by a circuit with a coil, in the mechanical equilibrium equa-tion of forces acting on the plunger, and in the pneumatic part the air pressure on the plunger. The calculations were performed in the Matlab/Simulink environment, creating current waveforms, acting forces and plunger displacement. Correctness of mathematical descrip-tion and determined in the course of opening and closing time calculations were related to the values declared by the manufacturer, show-ing differences below 3%. The presented mathematical model can be modified for other injector design solutions.

Evaluation of the influence of the supply pressure on functional parameters of the impulse low-pressure gas-phase injector

Szpica Dariusz, Borawski Andrzej, Mieczkowski Grzegorz, Kusznier Michał, Awad Mohamad M., Sadik Adel M., Sallah Mohammed

Acta Mechanica et Automatica

2020

Vol. 14, no. 4

180--185

The article presents research results referring to the influence of supply pressure on the functional parameters of the impulse low-pressure gas-phase injector. The study was done on the original stand for flow test of gas-phase injectors. In the indirect evaluation, with the initial parameters and the length of the forced impulse, the current line, acceleration and pressure sensor courses were used. Apart from the volumetric flow rate, the analysed parameters were the time periods of the injector opening and closing process. Those time segments were composed of response time and opening/closing time, the sum of which gives time of full opening. Functional relationships describing the volumetric flow rate, time of full opening and closing are presented, which are helpful not only in comparative tests of different injectors, but also in modelling the operation of gas injector or algorithms of gas supply control system. The reference to the volumetric flow rate allowed to indicate possible causes of variability of this parameter depending on the supply pressure.