New Approaches to Lube Oil Consumption Measurement Based on the Tracer Method

2019 ◽  
Author(s):  
Bernhard Rossegger ◽  
Michael Schneider ◽  
Albrecht Leis ◽  
Michael Engelmayer ◽  
Andreas Wimmer
Keyword(s):  
Oil Consumption ◽  
Tracer Method ◽  
New Approaches

Nano Napier Steel Second Ring for SI Applications

2014 ◽  
Author(s):  
Steve Sytsma ◽  
Erich Rabassa
Keyword(s):  
Product Development ◽  
Simulation Modeling ◽  
Spark Ignition ◽  
Oil Consumption ◽  
Tracer Method ◽  
Cross Sectional ◽  
Passenger Car ◽  
Manufacturing Location ◽  
Radial Thickness ◽  
Engine Testing

Piston top compression rings utilized in North American Spark Ignition (SI) passenger car and light truck engines have undergone a significant migration driven by desire to reduce axial height, mass, radial thickness, wear, incidence of risk of foundry defects and to enable utilization of a consistent, global material independent of manufacturing location. Second rings utilized in similar applications are now in the earlier stages of a similar migration. This paper will present product development of an innovative steel second ring including engine testing (blowby, and lube oil consumption via radiometric tracer method), supplemented by simulation modeling utilizing MIT code, including several more conventional ring cross sectional alternatives.

Influence of the Position of Oil Drain Holes of a Piston on Lubricating Oil Consumption

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Hiroki Hasegawa ◽  
Koji Kikuhara ◽  
Akemi Ito ◽  
Shunsuke Nishijima ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Pressure Sensors ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Tracer Method ◽  
Low Friction ◽  
Piston Skirt ◽  
Generation Mechanisms ◽  
Good Agreement

An increase in lubricating oil consumption in a gasoline engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst after treatment devices, abnormal combustion in a turbo-charged gasoline engine, and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore, reducing oil consumption is required strongly. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes hence the oil pressure were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front/rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front/rear end of the piston skirt were effective for reducing oil consumption.

Influence of the Position of Oil Drain Holes of a Piston on Lubricating Oil Consumption

2017 ◽  
Author(s):  
Hiroki Hasegawa ◽  
Koji Kikuhara ◽  
Akemi Ito ◽  
Shunsuke Nishijima ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Pressure Sensors ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Tracer Method ◽  
Low Friction ◽  
Piston Skirt ◽  
Generation Mechanisms ◽  
Good Agreement

An increase in lubricating oil consumption in an engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst of after treatment devices, abnormal combustion in a turbo-changed gasoline engine and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore reducing oil consumption is required strongly. It is known that oil pressure generated under the oil ring affects lubricating oil consumption. It is also known that the position of oil drain holes affects lubricating oil consumption. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes against the oil pressure under the oil ring were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured using a gasoline engine. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front / rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front / rear end of the piston skirt were effective for reducing oil consumption.

Beyond autism: Challenging unexamined assumptions about social motivation in typical development

2019 ◽  
Vol 42 ◽  
Author(s):  
Karen Bartsch ◽  
David Estes
Keyword(s):  
Social Interest ◽  
Social Motivation ◽  
Typical Development ◽  
Typically Developing ◽  
New Approaches

Abstract In challenging the assumption of autistic social uninterest, Jaswal & Akhtar have opened the door to scrutinizing similar unexamined assumptions embedded in other literatures, such as those on children's typically developing behaviors regarding others’ minds and morals. Extending skeptical analysis to other areas may reveal new approaches for evaluating competing claims regarding social interest in autistic individuals.

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