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Effects of RME30 on Exhaust Emissions and Combustion in a Diesel Engine
Technical Paper
2008-01-2499
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Considering the popularity of biodiesel fuels for diesel vehicles, the impacts of rapeseed oil methyl ester (RME), which is the most utilized biodiesel fuel in Europe, on tailpipe emissions from a diesel passenger car was investigated. In this study, 30% RME blended diesel fuel (RME30) was used and the comparison of tailpipe emissions between RME30 and a reference diesel fuel was conducted using a test vehicle with the latest engine and aftertreatment system.
The results of the investigation reveal that RME30 generates about the same amount of NOx in tailpipe emissions as diesel fuel, and less HC, CO, and PM. These phenomena occurred in spite of attaching catalysts to the test vehicle, and therefore suggesting that the NOx conversion efficiency of the catalysts for RME30 is equal to that for diesel fuel.
The injection rate for RME30 was the same as that for diesel fuel. As for spray characteristics, spray penetration for RME30 at high temperature and high pressure condition tended to be slightly stronger than that for diesel fuel, but the effect is thought to be too small to increase tailpipe emissions in vehicle tests.
The results of the combustion analysis of RME30 show no significant difference found in the heat release rates between RME30 and diesel fuel with pilot injections, which are usually operated. Without pilot injections, however, RME30 has a shorter ignition delay and even less HC, CO and PM emission characteristics than diesel fuel. This tendency was furthermore found to intensify under high EGR rate conditions. These phenomena, the superior ignitability of RME30 with the same cetane number as diesel fuel, seem to be due to the oxygen contained in RME30.
To analyze these phenomena, the combustion process was observed by methods of direct image and laser diagnostics. The observation results of vapor mixture by laser-induced fluorescence (LIF) measurement of HCHO and OH confirmed that RME30 exhibits more active LTR and HTR under higher EGR rate condition than diesel fuel. The active LTR and HTR of RME30 are thought to be related to the reduction of HC, CO and PM emissions.
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Citation
Yoshida, K., Taniguchi, S., Kitano, K., Tsukasaki, Y. et al., "Effects of RME30 on Exhaust Emissions and Combustion in a Diesel Engine," SAE Technical Paper 2008-01-2499, 2008, https://doi.org/10.4271/2008-01-2499.Also In
References
- Yamane Koji Biodiesel Tokyo Tokyotosho Shuppankai 2006 135
- McCormick R.L. Williams A. Ireiand J. Bribham M. Hayes R.R. Effects of Biodiesel Blends on Vehicle Emissions Milestone Report NREL/MP540-40554 2006
- Suzuki Masao Tsuzuki Naoyuki Teramachi Yoshihiro The new Toyota L-4 direct-injection diesel engine - Toyota D-4D Clean Power Concept 26 Internationales Wiener Motorensymposium 64 77 2005
- Asanuma Takamistu Hirota Shinya Yanaka Mitsugi Tsukasaki Yukihiro Tanaka Toshiaki Effect of Sulfur-free and Aromatics-free Diesel Fuel on Vehicle Exhaust Emissions using Simultaneous PM and NOx Reduction System SAE Technical Paper No. 2003-01-1865 2003
- Boehman, A.L. Szybist, J.P. Morris, D. Bhide, S. The impact of the bulk modulus of diesel fuels on fuel injection timing Energy Fuels 2004 18 6 1877 1882
- Szybist, J.P. Boehman, A.L. Behavior of a diesel injection system with biodiesel fuel SAE Technical Paper No. 2003-01-1039 2003
- Yamashita Hayato Suzuki Takashi Matsuoka Hiroshi Mashida Makoto Kitano Koji Research of the DI Diesel Spray Characteristics at High Temperature and High Pressure Ambient SAE Technical Paper No. 2007-01-0665 2007
- Hildingsson Leif Persson Hakan Johansson Bengt Collin Robert Nygren Jenny Richter Mattias Alden Marcus Hasegawa Ryo Yanagawa Hiromichi Optical Diagnostics of HCCI and Low-Temperature Diesel Using Simultaneous 2-D PLIF of OH and Formaldehyde SAE Technical Paper No. 2004-01-2949 2004
- Kawasaki Kiyoshi Yamane Koji Sone Kazutaka Hara Takeru Accelerated Oxidation Process in Biodiesel and Its Effect on Diesel Combustion and Emission Characteristics SAE Technical Paper No.20056044 2005
- Ogawa Tadao Kajiya Shuji Murase Atsushi Okada Masanori Analysis of Deterioration of Biodiesel JSAE Spring Convention Paper No.20075113 2007
- Yamane Koji Kawasaki Kiyoshi Hara Takeru Mori Kotaro A Fundamental Study for the Prevention of Biodiesel Fuel Oxidation Deterioration (Fourth Report) JSAE Autumn Convention Paper No.20075829 2007
- Shiotani Hitoshi Goto Shinichi Research on Fuel Property of Palm Oil Methyl Ester JSAE Autumn Convention Paper No.20075966 2007