Validation of indirect methods used in the operational assessment of LPG vapor phase pulse injectors

Szpica, Dariusz

doi:10.1016/j.measurement.2018.01.045

Cited by 20 publications

(20 citation statements)

References 39 publications

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“…The last method is not recommended due to factory settings, but is feasible. As shown by the studies presented in [ 67 ], increasing the stroke increases the flow capacity. The technical data of the analyzed injector Valtek Rail Type-30 have been presented in Table 1 .…”

Section: The Subject Of the Modelingmentioning

confidence: 92%

Model Evaluation of the Influence of the Plunger Stroke on Functional Parameters of the Low-Pressure Pulse Gas Solenoid Injector

Szpica

Kusznier

2021

Sensors

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The article presents a model-based evaluation of the impact of the plunger stroke on functional parameters of the low-pressure pulse gas solenoid injector. A reduced-order physics-based mathematical model was used to achieve this goal. The model was built on the basis of specified simplifications of the process, considering the forces that cause the plunger to move and the forces constituting resistance to its displacement. The implementation of a mathematical description in to the Matlab-Simulink environment allowed one to determine the characteristic values of operation of the Valtek Rail Type-30 injector, including plunger displacement courses. Calculations made with the assumption of the factory plunger stroke confirmed the validity of the model. The differences in opening and closing times were below 3% in comparison to the values given in the objects technical information. By assuming a specific plunger stroke, the functional relationships of opening and closing times were determined. The results showed a distortion of the force–response dependence for different plunger strokes. Results presented in the article can be used to support control-oriented modeling of systems incorporating pulsed gas dosing devices, such as combustion engines or gas turbines. More specifically, the proposed method can be used to pre-calibrate the delay time of the injector operation.

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Section: The Subject Of the Modelingmentioning

confidence: 92%

Model Evaluation of the Influence of the Plunger Stroke on Functional Parameters of the Low-Pressure Pulse Gas Solenoid Injector

Szpica

Kusznier

2021

Sensors

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“…In the friction linings of brake pads, mostly aluminum-based materials reinforced with, for example, silicon carbides, are used [82]. Their excellent properties such as: low density, good mechanical strength, resistance to high temperatures and good thermal conductivity [83][84][85] are features that are desirable in brake pads. Unfortunately, materials of this type also have their drawbacks.…”

Section: Bindermentioning

confidence: 99%

Conventional and unconventional materials used in the production of brake pads – review

Borawski

2020

Science and Engineering of Composite Materials

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Brakes are one of the most important components of vehicle. The brake system must be reliable and display unchanging action throughout its use, as it guards the health and life of many people. Properly matched friction pair, a disc and brake pad (in disc brakes), have a great impact on these factors. In most cases, the disc is made of grey cast iron. The brake pads are far more complex components. New technologies make it possible to develop materials with various compositions and different proportions, and connect them permanently in fully controllable processes. This elaboration shows that all these factors have a greater or lesser impact on the coefficient of friction, resistance to friction wear and high temperature, and brake pad’s operating life. This review collects the most important, the most interesting, and the most unconventional materials used in production of brake pads, and characterizes their impact on the tribological properties of pads.

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“…In case of controlling the opening of the gas injector, a transistor key is used and the voltage course is specific for the so-called short to ground (Szpica, 2018b). Therefore, this type of extortion should be reversed as an input value in the model, bypassing the part of the voltage drop, where overvoltage occurs in the opposite direction to extortion.…”

Section: Necessary Parameter To Initiate Calculationmentioning

confidence: 99%

Modelling of the Low-Pressure Gas Injector Operation

Szpica

Kusznier

2020

Acta Mechanica Et Automatica

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In recent years, there has been a growing interest in alternative sources of power supply for internal combustion engines. Liquefied petroleum gas injection systems are among the most popular. It becomes necessary to know mathematical descriptions of the operation 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 equation 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 description and determined in the course of opening and closing time calculations were related to the values declared by the manufacturer, showing differences below 3%. The presented mathematical model can be modified for other injector design solutions.

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Validation of indirect methods used in the operational assessment of LPG vapor phase pulse injectors

Cited by 20 publications

References 39 publications

Model Evaluation of the Influence of the Plunger Stroke on Functional Parameters of the Low-Pressure Pulse Gas Solenoid Injector

Model Evaluation of the Influence of the Plunger Stroke on Functional Parameters of the Low-Pressure Pulse Gas Solenoid Injector

Conventional and unconventional materials used in the production of brake pads – review

Modelling of the Low-Pressure Gas Injector Operation

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