Experimental and simulative research advances in the piston assembly of an internal combustion engine

Kirner, Claus; Halbhuber, Johannes; Uhlig, Benedict; Oliva, Alexander; Graf, Stefan; Wachtmeister, Georg

doi:10.1016/j.triboint.2016.03.005

Cited by 30 publications

(19 citation statements)

References 25 publications

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“…Little variation is indicated between strokes, showing that the piston and ring pack assembly are not supporting a highly varying combustion load. The standard difference is generally below 5 N. This trend agrees with experimental results obtained by other authors, 22,28–30 giving friction measurements of similar magnitude, erring on the piston assembly system. Additionally, the surface topography and the lubricant behaviour are critical factors, which can affect measurements along the piston stroke.…”

Section: Resultssupporting

confidence: 91%

“…Several methods have been developed to measure the friction between the piston assembly and the cylinder interface. [22][23][24][25][26][27][28][29][30][31][32] At this point, it is of interest to make a test rig with the actual engine operating conditions. Therefore, an air-cooled four-stroke motorbike engine was used.…”

Section: Methods Of Friction Measurementmentioning

confidence: 99%

“…It was shown that the friction mean effective pressure substantially decreases during the running-in process. Gore et al, 29 Kirner et al 30 and So¨derfja¨ll et al 31 also studied the tribological performance of the piston group in order to examine interactive physical phenomena in the piston-liner lubricated contact. Gore et al 29 measured the forces through a floating liner for different loads in a motorcycle engine.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it was found that boundary friction accounts for a large proportion of the total friction in a full engine cycle. This approach was extended by Kirner et al, 30 who used a laser-induced fluorescence method to determine the film thickness along the piston assembly system. The complexity of the piston secondary movement and the pressure conditions along the ring pack have been reported using a modified piston.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Zavos

Nikolakopoulos

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a thorough experimental study of piston assembly friction and noise in a single-cylinder motorbike engine operating at low speeds. The friction of the piston ring pack is evaluated using a foil strain gauge with minimal cylinder modification on the thrust side. The technique involves transmitting deformations through the cylinder bore and recording reflections from the lubricated interface as the piston assembly passes. Under these conditions, the piston side forces and the thermal deformations on the output side of the strain gauge sensor are critical. Therefore, the proposed methodology is designed under controlled operating conditions. The overall deformation of the piston assembly is analysed to measure the primary reflection due to friction between the piston assembly and the cylinder wall. Simultaneously, the piston assembly noise is recorded on the thrust side of the engine block using a microphone. Taking measured noise data into account, possible piston slap events resulting from varied engine speeds are taken into account using continuous wavelet signal analysis. The calibration procedure for both tests is also illustrated. The measured friction results show that the strain gauge technique is a challenging work in providing realistic results to enhance current technology. For low engine speeds, a higher contribution is noted by boundary friction at the top dead centre reversal, extending to the position of maximum combustion pressure in the power stroke. Furthermore, the main contribution of the piston slap is estimated at the thrust side when the piston assembly passes at the beginning of the combustion stroke. These results can also be attributed as data to validate piston ring models in terms of friction and piston slap.

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Section: Resultssupporting

confidence: 91%

Section: Methods Of Friction Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Zavos

Nikolakopoulos

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The work performance of piston-cylinder liner system is affected by the lubrication condition and the secondary motion of the piston. Therefore, more and more attention has been paid to the piston skirt lubrication and the secondary motion of the piston by many scholars recently [1][2][3][4][5][6]. Meng et al [7] introduced the oil film inertia force effects to the Reynolds lubrication equation; the effects of oil film inertia on film pressure, hydrodynamic friction force, and transverse displacement were investigated.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Lü

Wang

et al. 2018

Shock and Vibration

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The work performance of piston-cylinder liner system is affected by the lubrication condition and the secondary motion of the piston. Therefore, more and more attention has been paid to the secondary motion and lubrication of the piston. In this paper, the Jakobson-Floberg-Olsson (JFO) boundary condition is employed to describe the rupture and reformation of oil film. The average Reynolds equation of skirt lubrication is solved by the finite difference method (FDM). The secondary motion of pistonconnecting rod system is modeled; the trajectory of the piston is calculated by the Runge-Kutta method. By considering the inertia of the connecting rod, the influence of the longitudinal and horizontal profiles of piston skirt, the offset of the piston pin, and the thermal deformation on the secondary motion and lubrication performance is investigated. The parabolic longitudinal profile, the smaller top radial reduction and ellipticities of the middle-convex piston, and the bigger bottom radial reduction and ellipticities can effectively reduce the secondary displacement and velocity, the skirt thrust, friction, and the friction power loss. The results show that the connecting rod inertia, piston skirt profile, and thermal deformation have important influence on secondary motion and lubrication performance of the piston.

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Analyse der Kolbengruppenreibung und -schmierung von Ottomotoren – Die Bedeutung des Ölabstreifrings

Schäffer

Wachtmeister

2021

Forsch Ingenieurwes

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ZusammenfassungFür die Realisierung der in Paris definierten Klimaschutzziele wird die Optimierung des Verbrennungsmotors weiterhin eine tragende Rolle spielen. Sowohl für den Kleinmotor im Hybridantrieb als auch für den Großmotor in Nutzfahrzeugen und Baumaschinen hat eine Effizienzsteigerung höchste Priorität. Maßnahmen zur Reduktion der mechanischen Verluste werden typischerweise mit geschleppten Reibleistungsmessungen am Vollmotor (Strip-down Analyse) bewertet. Die Ergebnisse zeigen, dass bis zu 50 % der Gesamtverluste im tribologischen System Kolben/Zylinderlaufbahn entstehen. Zur Analyse der Kolbengruppenreibung wird eine kurbelwinkelbasierte Reibkraftmessung am Einzylindermotor eingesetzt, aus der sich der Reibmitteldruck als Maß der Effizienz ableiten lässt. Mit dem sogenannten Floating-Liner Motor wird zunächst bewertet, welche Wirkung mit der Tangentialkraftreduktion des Ölabstreifrings hinsichtlich Reibungsverluste erzielt werden kann. Da sich Reibung stets im Spannungsfeld mit Ölverbrauch befindet, wird zudem die Wirkung der reduzierten Tangentialkraft auf den Ölhaushalt der Kolbengruppe analysiert. Hierzu wurde ein Transparent-Aggregat entwickelt, das die Visualisierung der Schmierölströmung als auch eine Bewertung der Ölschichtdicken ermöglicht. Mit diesem kombinierten Ansatz können Maßnahmen gefunden werden, die zu einer Reduktion des CO2-Ausstoßes bei gleichbleibenden Ölemissionen führen. Letzteres gewinnt mit dem zukünftigen Einsatz synthetisch hergestellter Kraftstoffe (eFuels) zunehmend an Bedeutung, da diese nahezu partikelfrei verbrennen und somit der Öleintrag in den Brennraum als einzige Partikelquelle verbleibt.

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Experimental and simulative research advances in the piston assembly of an internal combustion engine

Cited by 30 publications

References 25 publications

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Analyse der Kolbengruppenreibung und -schmierung von Ottomotoren – Die Bedeutung des Ölabstreifrings

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