Determination of Octane Index and K in a 2.0L, 4-Cylinder Turbocharged SI Engine Using the Primary Reference Fuel (PRF) Method
Research Octane Number (RON) and Motor Octane Number (MON) have traditionally been used to describe fuel anti-knock quality. The test conditions for MON are harsher than those for RON, causing the RON for a particular fuel to be higher than the MON. Previous researchers have proposed the anti-knock performance of a fuel can be described at other operating conditions using the Octane Index (OI), defined as OI=RON-K (RON-MON), where ‘K’ is a weighing factor between RON and MON, and is a function of engine operating condition. The K-factor indicates that at a particular operating condition, knock tolerance is better described by RON as K approaches a value of 0, and MON as K approaches a value of 1. Previous studies claim that K-factor is dependent only on the engine combustion system and the speed-load point, and that it is independent of fuel chemistry. In most of these studies, K was determined experimentally using linear regression. In this particular study, K was determined using the PRF method for two test fuels; EPA certification tier 2 and tier 3 fuel. K was calculated for these fuels at multiple test points and the results showed that the K was different for the two fuels and thus it did depend on fuel chemistry. For a majority of the test points, the fuel with the lower RON and MON values (tier 3 cert fuel) had a lower K-factor as compared to the tier 2 cert fuel. A parameter was developed to relate engine speed, combustion phasing and cylinder trapped mass to predict K-factor, independent of the fuel. The correlation of K with end gas conditions was also investigated as a part of this project.
- Record URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
-
Supplemental Notes:
- Abstract reprinted with permission of SAE International.
-
Authors:
- Gopujkar, Siddharth
- Worm, Jeremy
- Duncan, Joel
- Hansley, William
-
Conference:
- WCX SAE World Congress Experience
- Location: Detroit Michigan, United States
- Date: 2020-4-21 to 2020-4-23
- Publication Date: 2020-4-14
Language
- English
Media Info
- Media Type: Web
- Features: Figures; Photos; References; Tables;
- Pagination: pp 3219-3230
-
Serial:
- SAE Technical Paper
- Volume: 2
- Issue Number: 6
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Combustion; Octane number; Spark ignition engines; Turbochargers
- Subject Areas: Energy; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01739912
- Record Type: Publication
- Source Agency: SAE International
- Report/Paper Numbers: 2020-01-0552
- Files: TRIS, SAE
- Created Date: May 26 2020 10:16AM