Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Lü, Yanjun; Liu, Cheng; Zhang, Yongfang; Wang, Jiahui; Yao, Kangrui; Du, Yongle; Müller, Norbert

doi:10.1371/journal.pone.0204179

Cited by 10 publications

(9 citation statements)

References 58 publications

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“…S. Bewsher et al [27] found that the total frictional loss under CDA is 9.53% higher than that under normal operation. Similar results have been achieved in [28][29][30]. However, a decrease in the overall frictional loss under CDA operation has been reported in [31,32].…”

Section: Introductionsupporting

confidence: 88%

Simulation and Analysis of the Impact of Cylinder Deactivation on Fuel Saving and Emissions of a Medium-Speed High-Power Diesel Engine

Liu

Kuznetsov

2021

Applied Sciences

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The potential benefit of cylinder deactivation (CDA) on power and emission performances has been numerically investigated on a locomotive 16-cylinder diesel engine. A 1D model combined with a predictive friction model and a 3D combustion model based and validated on experimental data have been developed to simulate engine working processes by deactivating half of the cylinders by cutting off the fuel supply and maintaining/cutting off valve motions. The results demonstrate that CDA with the valves closed decreases the BSFC by 11% at 450 rpm and by 14% at 556 rpm with a load of 1000 N∙m, due to increased indicated efficiency and reduced mechanical losses. After deactivating cylinders, frictional losses of piston rings increase in the active cylinders because of the raised gas pressure and the lubricating oil temperature decrease. Friction losses of the main bearings and big-end connecting rod bearings decrease due to the overall load drop. In comparison with the normal operation, CDA with the valves closed decreases the BSCO emission by 75.26% and the BSsoot emission by 62.9%. As the EGR rate is 30%, CDA with the valves closed effectively reduces the BSNOx emission to 4.2 g/(kW·h) at the cost of a 0.8% increase in the BSFC and without the rise in the BSCO emission.

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Section: Introductionsupporting

confidence: 88%

Simulation and Analysis of the Impact of Cylinder Deactivation on Fuel Saving and Emissions of a Medium-Speed High-Power Diesel Engine

Liu

Kuznetsov

2021

Applied Sciences

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“…The liner can be deformed from its ideal circular shape due to several processes, such as manufacturing tolerances, assembly load of the cylinder head and cylinder head gasket, thermal expansion variations between cylinder block and cylinder head, gas pressure during fire operations, temperature gradients during fire operations, and mechanical load during fire operations. 9–13 It was shown that operational thermal and mechanical load contributes more than 85% of the total liner deformation. 9 The prediction of the shape, the path, and the magnitude of this deformation is extremely important in any design improvement in order to reach a better engine performance.…”

Section: Introductionmentioning

confidence: 99%

“…He obtained a generalized expression for bore distortion and identified it as a criterion of piston ring conformability. Also, Lu et al 10 analyzed the tribological performance of the ring–liner system under cylinder deactivation considering the cylinder liner deformation and the change in oil supply. They used the Fourier series decomposition of the liner shape with fourth-order deformations (n = 4) to model the shape of the deformed liner, since lower order (n = 2) is completely accommodated by the elastic deformation of the compression ring.…”

Section: Introductionmentioning

confidence: 99%

Increasing the roundness of deformed cylinder liner in internal combustion engines by using a non-circular liner profile

Alshwawra

Pasligh

Hansen

et al. 2019

International Journal of Engine Research

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Increasing the efficiency of internal combustion engines is of major interest for reduced greenhouse gas emission. A significant improvement potential is given with the reduction of friction losses. Here, especially the friction between the piston ring and the cylinder liner is of interest. This article describes a study with the target to enhance the piston ring–cylinder liner conformation through increasing the roundness of the deformed liner during the warm operation state. The approach is based on the assumption that a non-circular liner in the cold state can deform due to thermal and mechanical stresses toward a circular shape under typical hot operation conditions. To test this hypothesis, a computational model for a gasoline engine was built and simulated using advanced finite element methods. The simulation describes the deformation process of the liner from the thermal and mechanical stresses. First, the deformation of a circular liner is simulated, showing asymmetric deformations of up to 30 µm in the warm state for the cylinder positioned at the end of the four-cylinder bank. As experimental data are readily available, a comparison was possible, showing good agreement. Then, three liner configurations with non-circular shape in the cold stage are investigated. For an elliptically shaped configuration, a nearly circular-shaped liner is reached under typical operation conditions. This numerical approach shows the potential for reduced friction of the piston–liner arrangement within internal combustion engines. The planned next step is the extension of this method to three-dimensional shape aspects and the application to the geometry of our test engine of our lab where friction can be measured in detail with a floating-liner measurement system.

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“…In terms of the effect of cylinder liners on friction, in [29], the authors studied that the friction of cylinder linerpiston ring reduces due to the impact of combustion shock excitation and piston side force. Lu et al [30] studied the effect of cylinder deactivation on the friction performance of cylinder liner.…”

Section: Introductionmentioning

confidence: 99%

Analysis of out-of-round deformation of a dry cylinder liner of a non-road high-pressure common-rail diesel engine based on multi-field coupling

Wang

Luo

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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The deformation of cylinder liner directly affects the sealing performance of the friction components in internal combustion engines, resulting in high oil consumption, engine power loss, and high-particulate matter emissions. Previous research works focused more on deformation of the wet vehicular cylinder liners, however, the effects of different loads on the dry liner deformation is not clear yet. A non-road high-pressure common-rail diesel engine was selected as the research object, and a coupled model of the engine was developed based on fluid-solid coupled heat transfer theory. After the accuracy of the model was verified by temperature measurement of the cylinder head and cylinder liner, deformation of the dry cylinder liner was studied. The results show that the axial and radial deformations of the cylinder liner are not uniform under the bolt preload condition. Large deformation occurs at the first liner and fourth liner, with the maximum deformation occurring at the top of fourth liner for 10.14 μm. Under the condition of thermal load, the temperature of cylinder liner exhibits a distribution of three-segments from the top to bottom. The liner deformation is not uniform, and the maximum deformation occurs at the top of the fourth liner for 304 μm. The radial deformations of all four cylinder liners present a symmetrical structure of a "heart" shape with respect to the centerline of the second and third cylinders. The axial deformation of each liner exhibits a "barrel" shape which is convex in the middle and narrow at the two ends.

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Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Cited by 10 publications

References 58 publications

Simulation and Analysis of the Impact of Cylinder Deactivation on Fuel Saving and Emissions of a Medium-Speed High-Power Diesel Engine

Simulation and Analysis of the Impact of Cylinder Deactivation on Fuel Saving and Emissions of a Medium-Speed High-Power Diesel Engine

Increasing the roundness of deformed cylinder liner in internal combustion engines by using a non-circular liner profile

Analysis of out-of-round deformation of a dry cylinder liner of a non-road high-pressure common-rail diesel engine based on multi-field coupling

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