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The Effect of Combustion Chamber Deposits on Octane Requirement Increase in a Spark Ignition Engine
Technical Paper
2008-01-1761
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Intake valve deposits (IVD) and combustion chamber deposits (CCD) in spark-ignition engines greatly affect nitrogen oxides (NOx) emission and octane requirement increases (ORI) as they prevent the heat release from the combustion chamber and increase the compression ratio. Currently, fuel performance additives to control IVD and CCD have been attracted and evaluation method based on CCD weight and thickness has been widely used.
However, simple measurement of the CCD weight and thickness does not clearly reflect the CCD effect on the ORI, as the shape and location of the deposits are also crucial factors that must be considered along with the weight and thickness of the deposits.
In this paper, an ORI engine test procedure using a 4 cylinder 2.0 liter SOHC engine is introduced. Applying this test procedure, several combinations of fuels and additives are investigated in order to verify the CCD effect on the ORI, considering not only the weight and thickness of CCD but also their shape and location.
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Citation
Jung, H., Kim, S., Lee, S., Park, S. et al., "The Effect of Combustion Chamber Deposits on Octane Requirement Increase in a Spark Ignition Engine," SAE Technical Paper 2008-01-1761, 2008, https://doi.org/10.4271/2008-01-1761.Also In
References
- Leduc P. Montagne X. “Characterization and Analysis of the Phenomena that Produce O.R.I.” SAE paper No. 952393 1995
- Price R. J. Beck C. M. Morley C. “Some Evidence for Chemical Effects on Octane Requirement Increase from Deposits in Spark Ignition Engines” SAE paper No. 971668 1997
- Nakic D. J. Assanis D. N. White Robert a. “Effect of elevated piston temperature on combustion chamber deposit growth” SAE paper No. 940948 1994
- Masaki N. Takashi K. Tatsuo O. Shin-ichi I. Hirofumi O. Shigeru M. “Mechanism of Combustion Chamber Deposit Interference and Effects of Gasoline Additives on CCD Formation” SAE paper No. 950741 1995
- Cheng S. S. “A micrographic study of deposit formation processes in a combustion chamber” SAE paper No. 962008 1996
- Kim H. J. Jung H. S. Kim S. H. Kim G. H. Whang J. T. “A Study on the Development of an Intake Valve Deposit Test Method” SAE paper No. 1999-01-3581 1999
- Haury E. “A Technique for Evaluating Octane Requirement Additives in Modern Engines on Dynamometer Test Stands” SAE paper No. 950744 1995
- Bannon S. A. Avery N. L. Bitting W. H. Carlson C. A. Daly D. T. Afflick P. F. Schoppe D. R. Swaynos D. V. “Development of a CRC Intake Valve Deposit Test” SAE Paper No. 940348 1994
- Burgdorf K. Denbratt I. G “Comparison of Cylinder Pressure Based Knock Detection Methods ” SAE paper No. 972932 1997
- Haury E. J. Graham J. “A Fleet Test Evaluation of the Effect on a Unique Gasoline Additive on Octane Requirement Emissions” SAE Paper No. 961098 1996
- Kalghatgi G. T. McDonald C. R. Hopwood A.B. “An experimental study of combustion chamber deposits and their effects in a spark ignition engine” SAE Paper No. 950680 1995