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Study of an Aftertreatment System for HLSI Lean-burn Engine
Technical Paper
2018-01-0945
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Lean-burn is an effective means of reducing CO2 emissions. To date, Homogenous Lean Charge Spark Ignition (HLSI) combustion, which lowers emissions of both CO2 and NOx, has been studied. Although HLSI realizes lower emission, it is a major challenge for lean-burn engines to meet SULEV regulations, so we have developed a new aftertreatment system for HLSI engines. It consists of three types of catalysts that have different functions, as well as special engine control methods. As the first stage in achieving SULEV emissions, this study focused on enhancing performance under lean conditions.
HLSI engine exhaust gases contain high concentrations of hydrocarbons, including a large amount of paraffin, which are difficult to purify, rather than low concentrations of NOx. Therefore, the key point in low emissions is to purify not only NOx, but also high concentrations of paraffin at the same time. Other issues include maintaining high performance under stoichiometry operation and reducing N2O emissions.
To resolve these issues, it is important to focus on the division of catalyst roles and their arrangement, and the modification of catalyst material. In this study, an aftertreatment system with three catalysts was developed. TWC was applied for the first catalyst to purify stoichiometry exhaust gases, and a new type of catalyst was used for the second and third catalysts in order to purify hydrocarbon and NOx under lean conditions. The new catalyst was an improvement based on a lean NOx trap catalyst, and was added to a paraffin purification material that highly enhances PGM activity by suppressing oxygen poisoning in PGMs, which hinders paraffin oxidation. The approach to enhancing NOx purification and reducing N2O emissions is to arrange the second and third catalysts with the optimal temperature properties in each position. This layout covers a wide temperature range for NOx performance and reduces N2O emissions.
This system was evaluated on an engine bench using a steady lean-rich cycle test. High performance under lean conditions was confirmed.
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Takeori, H., Wada, K., Matsuo, Y., Morita, T. et al., "Study of an Aftertreatment System for HLSI Lean-burn Engine," SAE Technical Paper 2018-01-0945, 2018, https://doi.org/10.4271/2018-01-0945.Data Sets - Support Documents
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References
- Stangmaier , R.H. and Roberts , C.E. Homogeneous Charge Compression Ignition (HCCI): Benefits, Compromises, and Future Engine Applications SAE Technical Paper 1999-01-3682 1999 10.4271/1999-01-3682
- Hanabusa , H. , Kondo , T. , Hashimoto , K. , Sono , H. et al. Study on Homogeneous Lean Charge Spark Ignition Combustion SAE Technical Paper 2013-01-2562 2013 10.4271/2013-01-2562
- Hanabusa , H. , Kondo , T. , Hashimoto , K. , and Furutani , M. Study on Cyclic Variations of Laminar Flame Speed in Homogeneous Lean charge Spark Ignition Combustion SAE Technical Paper 2016-01-2173 2016 10.4271/2016-01-2173
- Philipp , S. , Hoyer , R. , Adam , F. , Wunsch , R. et al. Exhaust Gas Aftertreatment for Lean Gasoline Direct Injection Engines-Potential for Future Application SAE Technical Paper 2013-01-1299 2013 10.4271/2013-01-1299
- Miyoshi , N. , Matsumoto , S. , Kato , K. , Tanaka , T. et al. Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines SAE Technical Paper 950809 1995 10.4271/950809
- Zhang , Z. , Chen , B. , Wang , X. , Crocker , M. et al. NOx Storage and Reduction Properties of Model Manganese-Based Lean NOx Trap Catalyst Applied Catalysis B :Environmental 165 232 244 2015
- Takeori , H. , Hosoe , H. , Morita , T. , and Endo , T. A Study of Aftertreatment System for Spark-Assisted HCCI Engine SAE Technical Paper 2015-01-2013 2015 10.4271/2015-01-2013
- Cho , C. , Pyo , Y. , Jang , J. , Shin , Y. et al. NOx Reduction and N 2 O Emissions in a Diesel Engine Exhaust Using Fe-Zeolite and Vanadium Based SCR Catalysts Applied Thermal Engineering 110 18 24 2016
- Takeori , H. , Hosoe , H. , Okayama , T. and Endo , T. et al. 2016 432
- Yazawa , Y. , Takagi , N. , Yoshida , H. , Hattori , T. et al. The Support Effect on Propane Combustion over Platinum Catalyst : Control of the Oxidation-Resistance of Platinum by the Acid Strength of Support Materials Applied Catalysis A: General 223 103 112 2002
- Hupa , M. 2 2 1992 133 147
- Wang , J. , Wang , X. , Zhu , J. , Shen , M. et al. Elucidating N 2 O Formation during the Cyclic NOx Storage and Reduction Process Using CO as a Reductant Environmental Science and Technology 49 7965 7973 2015
- David , M. , Petr , K. , Jae-Soon , C. , and William , P. New Operation Strategy for Driving the Selectivity of NO Reduction to N 2, NH 3 or N 2 O during Lean/Rich Cycling of a Lean NO Trap Catalyst Applied Catalysis B :Environmental 182 109 114 2016
- Kubiak , L. , Ringhini , L. , Castoldi , L. , Matarrese , R. et al. Mechanistic Aspects of N 2 O Formation Over Pt-Based Lean NOx Trap Catalysts Topics in Catalysis 59 976 981 2016