Study on Wall Pore Structure for Next Generation Diesel Particulate Filter

Mizuno, Youichi; Miyairi, Y.; Katsube, F.; Ohara, E.; Takahashi, Akira; Makino, Mikio; Mizutani, Takashi; Yuki, Kazuya; Kurachi, Hiroshi

doi:10.4271/2008-01-0618

Cited by 31 publications

(13 citation statements)

References 4 publications

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“…They suggest that most of the soot mass is accumulated in the soot cake but its contribution to the total pressure drop is typically only 8 to 50 per cent of the total. In addition, the impact of soot loading on the pressure difference is not linear and is higher in the deep wall filtration phase than in the soot cake forming phase [5,6]. Thus the estimation of the soot load by open loop models or closed-loop estimation based on the pressure drop is still subject to uncertainty.…”

Section: Introductionmentioning

confidence: 99%

“…Thus the estimation of the soot load by open loop models or closed-loop estimation based on the pressure drop is still subject to uncertainty. This difficulty is due to the limited resources to apply and calibrate complex models and the non-linear relationship between the soot mass loading and the pressure drop across the DPF [6,7]. In order precisely to calibrate and tune the soot estimating models, it is desirable to have devices that can estimate the status of soot deposit on the DPF under the transient mode.…”

Section: Introductionmentioning

confidence: 99%

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Light scattering technique for estimating soot mass loading in diesel particulate filters

Kamimoto

Murayama

Minagawa³

et al. 2009

International Journal of Engine Research

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The real-time estimation of soot mass loading on diesel particulate filters (DPF) is essential to assure perfect and fuel efficient regeneration. Computer models based on the pressure drop across the DPF are usually installed in the engine control unit to estimate the soot mass loading during vehicle driving, but this approach is still subject to uncertainty about the lack of resources available. The aim of this study is to develop a portable instrument that can make real-time measurements of soot mass loading under transient mode for calibrating the models. The instrument is based on the light scattering technique: a laser beam illuminates diesel particles in a small exhaust sample and the intensity of scattered light from soot particles is reduced to soot mass concentration using calibration data obtained under steady engine operating conditions. It is demonstrated that the prototype instrument can measure the temporal variations of cumulative soot mass and filtration efficiency of a diesel particulate filter under a transient mode, and that it has a minimum detectable concentration of 5 mg/m 3 ,which is low enough to detect the particle breakthrough in the DPF. The proposed technique has potential to be applied for on-board diagnostics if the device is downsized.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light scattering technique for estimating soot mass loading in diesel particulate filters

Kamimoto

Murayama

Minagawa³

et al. 2009

International Journal of Engine Research

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“…This improved technology was referred to as the dual layer pore structure, in which the gas inflow side of the wall is given a filtration layer having small pores and a high porosity. It has been demonstrated to drastically improve the filtration efficiency, drastically reduce the backpressure with particle accumulation, and provide a linear relationship between soot loading and backpressure [19]. The ash loaded DPFs were found to show similar features of reducing the pressure drop [20,21].…”

Section: Introductionmentioning

confidence: 89%

Experimental Study on the Influence of DPF Micropore Structure and Particle Property on Its Filtration Process

Meng

Fang

et al. 2016

Journal of Combustion

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A single layer filtration system was developed to investigate the filtration and regeneration performance of diesel particle filter (DPF). The particle layer thickness was directly measured online to analyze the different filtration stages. The influence of particle property on particle layer stage performance was also investigated. The results indicate that the filtration velocity can greatly affect the deep bed filtration stage, and the deposited particle layer can be compressed even in very low filtration velocity and higher filtration velocity trends to form denser particle layer. Optimizing the pore structure can effectively shorten the deep bed filtration stage and reduce the pressure drop eventually. An empirical function was proposed to relate the pore structure and the initial increment rate of pressure drop, which presented that reducing the pore size distribution range (3σ) can result in low DPF filtration pressure drop. The filtration stage could be further divided into four stages, and the value of particle layer thickness ranging within 15~20 μm has been found to be critical number for the shift from the transient stage to the cake filtration stage. Particle with large primary diameter and BET surface was beneficial to form loose particle layer.

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“…The authors thought the partitioning of SOF has implications to organic carbon particulate oxidation in the filter. Others show that when a porous membrane is added to the inlet wall, soot is kept out of the wall and filtration efficiency and back pressure improve, as well as the correlation between back pressure and soot loading (59).…”

Section: Pm Control Technologiesmentioning

confidence: 99%

Diesel Emission Control in Review

Johnson

2008

SAE Int. J. Fuels Lubr.

206

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This summary covers representative developments from 2008 in diesel regulations, engine technology, and NOx, particulate matter (PM), and hydrocarbon (HC) control. Europe is finalizing the Euro VI heavy-duty (HD) regulations for 2013 with the intent of technologically harmonizing with the US. A new particle number standard will be adopted. California is considering tightening the light-duty fleet average to US Tier 2 Bin 2 levels, and CO 2 mandates are emerging in Europe for LD, and in the US for all vehicles. LD engine technology is focused on downsizing to deliver lower CO 2 emissions, enabled by advances in boost and EGR (exhaust gas recirculation). Emerging concepts are shown for attaining Bin 2 emission levels. HD engines will make deNOx systems optional for even the tightest NOx standards, but deNOx systems enable much lower fuel consumption levels and will likely be used. NOx control is centered on SCR (selective catalytic reduction) for diverse applications. Focus is on cold operation, system optimization, and catalyst durability. LNT (lean NOx trap) performance is advancing and precious metal cost content is decreasing. Desulfation is enhanced, and new compositions are emerging based on alumina and ceria. LNCs (lean NOx catalysts or HC-SCR) developments are updated. Diesel particulate filter (DPF) technology is in a state of optimization and cost reduction. New DPF regeneration strategies are described as well as the new learnings on the fundamentals of soot/catalyst interaction and the impact of DPF pore structure. Finally an update on diesel oxidation catalysts (DOCs) is provided showing potential solutions for advanced combustion strategies.

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Study on Wall Pore Structure for Next Generation Diesel Particulate Filter

Cited by 31 publications

References 4 publications

Light scattering technique for estimating soot mass loading in diesel particulate filters

Light scattering technique for estimating soot mass loading in diesel particulate filters

Experimental Study on the Influence of DPF Micropore Structure and Particle Property on Its Filtration Process

Diesel Emission Control in Review

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