A study of signal noise reduction of the mass air flow sensor using the flow conditioner on the air induction system of heavy-duty truck

Savcı, İsmail Hakkı; Şener, Ramazan; Duman, Ipek

doi:10.1016/j.flowmeasinst.2022.102121

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…Unfortunately, these flow conditions are not maintained when MAF sensors are used in engines. Air flow causes turbulence around the sensor and interference with the sensor signal, resulting in unstable mass flow measurements [150].…”

Section: Effects Of Contaminants On Air Flow Meter Performancementioning

confidence: 99%

A Study on the Effect of Inlet Air Pollution on the Engine Component Wear and Operation

Dziubak

2022

Energies

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This paper systematically reviews the research progress in the field of the influence of air pollutants in the engine inlet on the accelerated wear of the elements of the association: piston, piston rings, cylinder liner (P-PR-CL), and plain bearing (journal–panel). It was shown at the outset that the primary component of air pollution is road dust. Its main components are dust grains of hard minerals (SiO2, Al2O3), which penetrate the oil film area between two frictionally mating surfaces causing their abrasive wear. Therefore, the effect of three dust parameters (grain size and hardness, and dust concentration in air) on the accelerated wear of the friction pair: piston, piston rings, cylinder liner(P-PR-CL), and plain bearing (journal–pan) is presented extensively. It was noted that the wear values of the same component were obtained by different researchers using different testing techniques and evaluated by different indices. It has been shown that the greatest wear of two frictionally cooperating surfaces is caused by dust grains with sizes equal to the thickness of the oil film at a given moment, which in typical combustion engine associations assumes varied and variable values in the range of 0–50 µm. The oil film thickness between the upper ring and the cylinder liner varies and depends on the crankshaft rotation angle, engine speed and load, and oil viscosity, and takes values less than 10 µm. It was shown that the maximum wear of the cylinder liner, resulting from the cooperation with the piston rings, occurs in the top dead centre (TDC) area and results from unfavorable (high temperature, low piston speed) operating conditions of these elements. From the extensive literature data cited, it follows that abrasive wear is caused by dust grains of specific dimensions, most often 5–20 µm, the greater the wear the greater the hardness of the grains and the sulfur content of the fuel. At the same time, it was shown that the main bearing, crankshaft bearing, and oil ring experienced maximum wear by a different range of particle size, respectively: 20–40, 5–10, and 20–80 μm. It was shown that the mass of dust that enters the engine cylinders and thus the wear of the components is determined by the concentration of dust, the value of which is definitely reduced by the air filter. However, it was pointed out that the low initial filtration efficiency and the presence of large dust grains in the purified air in the initial period of the filter operation (after replacement of the filter element with a new one) may have an impact on the accelerated wear of mainly (P-PR-CL) association. The next stage of the paper presents the effects of excessive wear of the cylinder liner and piston rings of the engine, resulting from actual vehicle operation and bench tests on the decrease in compression pressure and engine power, increase in the intensity of exhaust gas blow-by into the oil sump and increase in oil consumption and exhaust gas toxicity. This paper addresses the current problem of the effect of engine inlet air contaminants on the performance of the air flow meter, which is an essential sensor of the modern internal combustion engine. The phenomenon of deposition of contaminants (mineral dust, salt, carbon deposit, and moisture) on the measuring element (wire or layer anemometer) of the air flow meter has been analyzed. The empirical results presented show that the mineral dust layer on the measuring element of the air flow meter causes a 17.9% reduction in output voltage, and the dust and oil layer causes a 46.7% reduction in output voltage. This affects the decrease in engine power and exhaust toxicity.

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Section: Effects Of Contaminants On Air Flow Meter Performancementioning

confidence: 99%

A Study on the Effect of Inlet Air Pollution on the Engine Component Wear and Operation

Dziubak

2022

Energies

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“…On the other hand, vibrations caused by the resistance of the flowing air are in the frequency range of 250-16,000 Hz and are caused by the detachment of the air stream from the machine elements (Sovardi et al, 2016;Savcı et al, 2022). Phenomena related to the flow of the working medium in the hydraulic system cause vibrations and noise (He et al, 2023;Song et al, 2022;Han et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Mechanical Vibrations on Hydraulic Valves and the Possibility of Reducing the Effects

Stosiak,

Skačkauskas,

Deptuła

2024

Aviation

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The paper shows that mechanical vibrations occur in a wide frequency range in the hydraulic systems operating in the real world. Hydraulic valves are also exposed to these vibrations. The paper gives examples of vibration sources and suggests that the influence of vibrations on hydraulic valves could be reduced. Particular attention was paid to the vibrating proportional distributor. The amplitude-frequency spectrum of pressure pulsation in a hydraulic system with a vibrating proportional distributor was analysed. During the tests, the frequency of external mechanical vibrations acting on the proportional distributor and their direction was changed.

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“…It was found that the honeycomb porous metal flow conditioner can make the two-phase flow more stable and uniform. Savci et al (2022) evaluated the effectiveness of honeycomb flow conditioners used in heavy-duty truck applications. The results showed that the installation of the flow conditioner can smooth the velocity distribution around the mass flowmeter influenced by the bending.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of structural parameters of the convergence flow conditioner on eccentric jet flow rectification

Liu

Chen

Tian

et al. 2023

Transactions of the Institute of Measurement and Control

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In flow measurement and control industrial application, installing a flow conditioner is an effective way to rectify irregular and unstable flow to stable flow state within a short flow distance. To effectively rectify the eccentric jet flow caused by valve regulation in pipeline, the convergence flow conditioner with convergent orifice angles has been innovatively designed and investigated. However, the effect of structural parameters (such as flow conditioner thickness and flow area) on improving unstable eccentric jet flow rectification was still not elaborated. Thus, the effect of structural parameters of the convergence flow conditioner on rectifying eccentric jet flow was examined in this paper. The structural parameters of the flow conditioner thickness and the flow area were considered under the fixed convergence angle of 12°. The experimental system of monitoring pressures upstream and downstream of the convergence flow conditioner along the pipeline was developed and corresponding numerical simulation was employed. The flow coefficient and resistance coefficient of a convergence flow conditioner under various valve openings were accessed, and monitored pressures along the pipeline were also discussed for numerical simulation verification. The velocity and streamline distributions downstream the convergence flow conditioners were comparatively analyzed. In addition, the axial velocities on various downstream cross-sections were extracted to evaluate the velocity uniformity. A dimensionless parameter of velocity deviation ratio was introduced to quantify the rectification effect of eccentric jet flow evolving in the downstream pipeline. Results showed that the convergence flow conditioner with the thickness of 6 mm and the flow area of 50% owned a better effect on rectifying the valve-induced eccentric jet flow, that is, a shorter flow length was required for changing the valve-induced eccentric unstable flow to uniform stable flow by installing a convergence flow conditioner with above structural parameters.

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A study of signal noise reduction of the mass air flow sensor using the flow conditioner on the air induction system of heavy-duty truck

Cited by 4 publications

References 12 publications

A Study on the Effect of Inlet Air Pollution on the Engine Component Wear and Operation

A Study on the Effect of Inlet Air Pollution on the Engine Component Wear and Operation

The Impact of Mechanical Vibrations on Hydraulic Valves and the Possibility of Reducing the Effects

Study on the effect of structural parameters of the convergence flow conditioner on eccentric jet flow rectification

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