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Oil Transport Phenomena during extreme load transients inside the power cylinder unit as investigated by HS-2DLIF (High-Speed 2D Laser-Induced Fluorescence)
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 19, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
This paper presents findings of optical investigations conducted via the HS-2DLIF (high-speed two-dimensional laser-induced fluorescence) technique under extreme transient conditions. These extreme conditions are a transition from WOT to closed throttle and vice versa. The goal is to gain a better understanding of oil transport magnitudes and timescales for transitions to and from extreme throttled conditions. These conditions are similar to the boundary conditions found during cylinder deactivation.
The transients were conducted under motored conditions with injection and spark disabled in a speed range from 650 rpm to 3000 rpm. The load was transitioned from WOT to different low load conditions (closed, 150 mbar and 200 mbar), held at that low load for a variety of durations (10 sec - 600 sec), before going back to WOT. The experiments showed a strong dependence of oil transport on speed and load. The higher the speed, the faster the oil transport.
When transitioning to WOT in cases with a lot of oil in the ring pack, a drastic blow-by increase could be measured. The cause of the phenomena could be explained in detail with HS-2DLIF. Previous hypotheses were able to be verified and extended. It was found that, during the time spent at low engine load, oil was transported towards the combustion chamber and into the top ring groove. When a sufficient amount accumulated, the introduction of the transient allowed flow past the top ring, since its sealing capability was lost due to oil blocking its path towards its ID (inner diameter). Additionally, a large amount of oil was pushed through the top ring gap due to reverse flow in collapsing cycles. The top ring collapse ended when enough oil was suddenly released, allowing the ring to regain sealing capabilities.
CitationAhling, S. and Tian, T., "Oil Transport Phenomena during extreme load transients inside the power cylinder unit as investigated by HS-2DLIF (High-Speed 2D Laser-Induced Fluorescence)," SAE Technical Paper 2019-01-2363, 2019, https://doi.org/10.4271/2019-01-2363.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- S. Przesmitzki and T. Tian, “Oil Transport Inside the Power Cylinder During Transient Load Changes,” SAE Tech. Pap. 2007-01-1054, vol. 2007, no. 724, pp. 776-790, 2007.
- S. Przesmitzki and T. Tian, “An Experimental Study of the Time Scales and Controlling Factors Affecting Drastic Blow-by Increases during Transient Load Changes in SI Engines,” SAE Tech. Pap. 2008-01-0794, no. 724, 2008.
- Ma, Z., “Oil Transport Analysis of a Cylinder Deactivation Engine,” SAE Tech. Pap. 2010-01-1098, 2010.
- R. Sandford, M. Allen, J. Tudor, “Reduced Fuel Consumption and Emissions Through Cylinder Deactivation,” Futur. Engine Syst. Technol., vol. 5, pp. 211-222.
- E. Yilmaz, B. Thirouard, T. Tian, V. W. Wong, J. B. Heywood, and N. Lee, “Analysis of Oil Consumption Behavior during Ramp Transients in a Production Spark Ignition Engine,” SAE Tech. Pap. 2001-01-3544, no. 724, 2001.
- S. Ariga, “Observation of Transient Oil Consumption with In-Cylinder Variables,” no. 412, 2013.
- K. Froelund, “Real-Time Transient and Steady-State Measurement of Oil Consumption for Several Production SI-Engines,” no. 724, pp. 7-9, 2013.
- B. Thirouard, “Characterization and Modeling of the Fundamental Aspects of Oil transport in the Piston Ring Pack of Internal Combustion Engines,” 2001.
- S. Przesmitzki, “Characterization of Oil Transport in the Power Cylinder of Internal Combustion Engines during steady state and transient Operation,” 2008.
- T. Mueller, S. Wigger, and H.-J. Fuesser, “Optische Untersuchungen der Schmierungsverhaeltnisse im Reibkontakt Kolbenhemd/Zylinderlaufbahn mittels laserinduzierter Fluoreszenz an einem optisch zugaenglichen Einzlindermotor,” p. .
- E. Zanghi, “Analysis of Oil Flow Mechanisms in Internal Combustion Engines via High Speed Laser Induced Fluorescence (LIF) Spectroscopy,” 2014.
- E. Zanghi and T. Tian, “Development of a High Speed Laser Induced Fluorescence (HSLIF) System in a Single Cylinder Engine for Oil Transport Studies,” pp. 3-9, 2016.
- T. Tian, “Modeling the Performance of the Piston Ring Pack in Internal Combustion Engines.”
- T. Tian, “Dynamic behaviours of piston rings and their practical impact. Part 1: ring flutter and ring collapse and their effects on gas flow and oil transport,” Proc. Inst. Mech. Eng. Part J J. Eng. Tribol., vol. 216, no. 4, pp. 209-228, 2002.