Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines
Reducing the Lubricating Oil Consumption (LOC) has been a critical focus for engine manufacturers. LOC not only depends on engine operating condition but also the history of the operating condition variations. This work seeks to understand the oil transport in the ring pack during the low load to hi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/11/2/76 |
| _version_ | 1797619747982934016 |
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| author | Mo Li Tian Tian |
| author_facet | Mo Li Tian Tian |
| author_sort | Mo Li |
| collection | DOAJ |
| description | Reducing the Lubricating Oil Consumption (LOC) has been a critical focus for engine manufacturers. LOC not only depends on engine operating condition but also the history of the operating condition variations. This work seeks to understand the oil transport in the ring pack during the low load to high load transient through experimental investigations. An optical engine with 2D Laser Induced Fluorescence (2D-LIF) technique, equipped with a modern low-tension Three-Piece Oil Control Ring (TPOCR), was applied to investigate the oil transport in the ring pack. It was found that, after the engine stayed under the blowby separation line long enough, a sudden increase to high load can result in a huge increase of oil ejection to the liner from the top ring groove in the expansion strokes. The mechanism behind it is that, when the load is increased, the oil accumulated inside the top ring groove during the low load condition is pushed out by the gas flow after the peak cylinder pressure is reached. Different combinations of load, speed, rate of change in load and time duration at low load were tested to examine their influence on this leakage mechanism. An operation with a gradual increase of engine load was found to be able to reduce the amount of oil leaked to the liner by releasing more oil to the second land. These findings can help the effort to reduce the oil emission (OE) generated from Spark Ignited (SI) engines equipped with TPOCR in the real-world transient driving conditions as well as the emission tests. |
| first_indexed | 2024-03-11T08:32:16Z |
| format | Article |
| id | doaj.art-2f521ad6cc8c46be970638d71c29682c |
| institution | Directory Open Access Journal |
| issn | 2075-4442 |
| language | English |
| last_indexed | 2024-03-11T08:32:16Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj.art-2f521ad6cc8c46be970638d71c29682c2023-11-16T21:44:01ZengMDPI AGLubricants2075-44422023-02-011127610.3390/lubricants11020076Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion EnginesMo Li0Tian Tian1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USADepartment of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USAReducing the Lubricating Oil Consumption (LOC) has been a critical focus for engine manufacturers. LOC not only depends on engine operating condition but also the history of the operating condition variations. This work seeks to understand the oil transport in the ring pack during the low load to high load transient through experimental investigations. An optical engine with 2D Laser Induced Fluorescence (2D-LIF) technique, equipped with a modern low-tension Three-Piece Oil Control Ring (TPOCR), was applied to investigate the oil transport in the ring pack. It was found that, after the engine stayed under the blowby separation line long enough, a sudden increase to high load can result in a huge increase of oil ejection to the liner from the top ring groove in the expansion strokes. The mechanism behind it is that, when the load is increased, the oil accumulated inside the top ring groove during the low load condition is pushed out by the gas flow after the peak cylinder pressure is reached. Different combinations of load, speed, rate of change in load and time duration at low load were tested to examine their influence on this leakage mechanism. An operation with a gradual increase of engine load was found to be able to reduce the amount of oil leaked to the liner by releasing more oil to the second land. These findings can help the effort to reduce the oil emission (OE) generated from Spark Ignited (SI) engines equipped with TPOCR in the real-world transient driving conditions as well as the emission tests.https://www.mdpi.com/2075-4442/11/2/76engineoil consumptionpistonblow-by |
| spellingShingle | Mo Li Tian Tian Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines Lubricants engine oil consumption piston blow-by |
| title | Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines |
| title_full | Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines |
| title_fullStr | Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines |
| title_full_unstemmed | Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines |
| title_short | Experimental Investigation of Oil Transport during Low Load to High Load Transient in Internal Combustion Engines |
| title_sort | experimental investigation of oil transport during low load to high load transient in internal combustion engines |
| topic | engine oil consumption piston blow-by |
| url | https://www.mdpi.com/2075-4442/11/2/76 |
| work_keys_str_mv | AT moli experimentalinvestigationofoiltransportduringlowloadtohighloadtransientininternalcombustionengines AT tiantian experimentalinvestigationofoiltransportduringlowloadtohighloadtransientininternalcombustionengines |