Engine tests for coking and contamination of modern multi-injection injectors of high-pressure fuel supplies compression-ignition engine

Stanik, Winicjusz; Jakóbiec, J.; Mazanek, Aleksander

doi:10.17531/ein.2018.1.17

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Engineering Review, DOI: 10.30765/er.1475 5 ________________________________________________________________________________________________________________________ the process of gradual coking of the nozzle tip [20] takes place, which additionally changes the geometry of the outlet holes (nozzles) [21]. As a result, there is a diversification of the amount of fuel injected into the engine cylinders [22].…”

Section: A C C E P T E Dmentioning

confidence: 99%

Simplified methodology for testing common rail piezoelectric injectors taking into account reference characteristics

2021

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The article presents the methodology of testing Continental/Siemens VDO piezoelectric injectors. To determine the correctness of their operation, the reference characteristics were used, which, due to the lack of guidelines from the manufacturer, constituted the only reference base for the obtained expenses and the intensity of fuel overflows. Simultaneously, the phase of the active experiment was simplified by limiting the number of measuring points, and then estimating the missing data using the Aitken iterative technique. Automation of the calculation process was obtained thanks to the proprietary numerical algorithm, whose formulas were introduced into a standard spreadsheet.

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Section: A C C E P T E Dmentioning

confidence: 99%

Simplified methodology for testing common rail piezoelectric injectors taking into account reference characteristics

2021

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Evaluation of changes in fuel delivery rate by electromagnetic injectors in a common rail system during simulated operation

Kamiński¹,

Budzyński²,

Hunicz³

et al. 2021

Eksploatacja i Niezawodność – Maintenance and Reliability

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The objective of this study was to determine changes in fuel delivery rate by common rail system injectors during their simulated operation on a test stand. Four Bosch injectors used, among others, in Fiat 1.3 Multijet engines were tested. The injectors were operated on a test rig at room temperature for 500 hours (more than 72 million work cycles). During the test, pressure and injection frequency were changed. Changes in the operating parameters were estimated based on obtained injection characteristics and effective flow area determined thereby. The observed changes in fuel delivery rate were compared with results of the surface analysis of control valves and nozzle needles. Despite the stated lack of wear, significant changes in the dynamics of injector operation were observed, particularly at short injection times. Small pilot injections do not have to be corrected by the fuel injection control system because they do not affect the changes in torque; however, they do affect the combustion process. This creates conditions for increased emission of toxic exhaust components.

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Internal combustion engine diagnostics using statistically processed Wiebe function

Famfulík¹,

Richtář²,

SMIRAUS³

et al. 2021

Eksploatacja i Niezawodność – Maintenance and Reliability

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The aim of the article is to present the concept of an indirect diagnostic method using the assessment of the variability of the amount of released heat (mass fraction burn) and the heat release rate. The Wiebe function for the assessment of variability has been used. The Wiebe function parameters from the course of the high-pressure indication in the cylinder of internal combustion engine using linear regression have been calculated. From a sufficiently large number of measured samples, the upper and lower limits of the Wiebe function parameters have been statistically determined. Lower and upper limits characterize variability of the heat release process not only in terms of quantity but also in terms of heat release rate. The assessment of variability is thus more complicated than using one integral indicator, typically the mean value of amount of the released heat. The procedure enabling a more accurate estimation of heat generation beginning has been shown. For the combustion process variability assessment of the engine, statistical test of relative frequencies has been used.

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Engine tests for coking and contamination of modern multi-injection injectors of high-pressure fuel supplies compression-ignition engine

Abstract: Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl

Cited by 3 publications

References 12 publications

Simplified methodology for testing common rail piezoelectric injectors taking into account reference characteristics

Simplified methodology for testing common rail piezoelectric injectors taking into account reference characteristics

Evaluation of changes in fuel delivery rate by electromagnetic injectors in a common rail system during simulated operation

Internal combustion engine diagnostics using statistically processed Wiebe function

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