A Study on the Performance Deterioration of SCR for Heavy-Duty Diesel Vehicles

Kwon, Manjae; Park, Giyoung; Lim, Hyunjae; Kim, Jungjun; Lee, Seangwock; Kim, Kiho; Song, Hoyoung

doi:10.4271/2019-01-2235

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…With the CR X-ray imaging technique, the channel pattern inside the substrate can be observed in the images obtained under the optimal imaging conditions [18]. In the images of the normal DPF, patterns other than the substrate-specific channel pattern do not appear.…”

Section: How To Read Damaged Parts Of Dpf From Video Materialsmentioning

confidence: 99%

A Study on the Impact of DPF Failure on Diesel Vehicles Emissions of Particulate Matter

Park

Hwang

et al. 2023

Applied Sciences

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A diesel particulate filter (DPF) is an after-treatment device designed to capture and store exhaust particulate matter emitted by diesel vehicles. DPFs are damaged owing to complex reasons, such as regeneration processes and loads generated during driving. While DPFs can be damaged, they can also be manipulated, especially DPFs with hollow damage. In such cases, the filtration performance deteriorates significantly, and excessive amounts of smoke and ash are emitted during driving, resulting in environmental pollution. In this study, DPF damage types were observed using the CR X-ray imaging technique without removing the DPF. In addition, it was experimentally determined that the five types of DPF shapes (normal, crack, melt, plug, and hollow) caused increases in the particle number (PN) and smoke concentration. Experiments were conducted in the Korea Diesel 147 (KD-147) vehicle driving mode, and the PN and smoke concentration were measured using a nanoparticle emission tester 3795 (NPET-3795-HC) and opacimeter (OPA-102). The experiment was conducted 10 times for each type of DPF damage. As a result of the experiment, no significant difference was found between the normal DPF and crack-damaged DPF in terms of smoke emission, but there was a definite difference in the smoke concentration relative to the other DPF damage types. DPF of all damage types satisfied Korea’s smoke concentration regulation. In addition, the PN emission characteristics differed clearly in terms of the values measured for each damage type, and, unlike the smoke concentration characteristics, there was a clear difference in the PN emission characteristics of various DPF damage types. In addition, the PN concentration tended to increase in the rapid acceleration section of the KD-147 vehicle driving mode for all DPF damage types.

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Section: How To Read Damaged Parts Of Dpf From Video Materialsmentioning

confidence: 99%

A Study on the Impact of DPF Failure on Diesel Vehicles Emissions of Particulate Matter

Park

Hwang

et al. 2023

Applied Sciences

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“…These results signify that diesel engines are responsible for more than half of PM emissions in the Seoul Metropolitan Area [1]. A few years ago, research studies reported poorer performance of the after-treatment device due to an increase in the driving mileage of in-use vehicles [2,3]. Furthermore, concerns are being raised over air pollution triggered by aged diesel vehicles and construction equipment without after-treatment devices.…”

Section: Introductionmentioning

confidence: 99%

A Study on Soot and Ash Accumulation Characteristics of Diesel Particulate Filter Substrate Using Nondestructive Computed Radiography X-ray Imaging Technique

et al. 2021

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The diesel particulate filter of a diesel engine is an after-treatment device that removes particulate matter from exhaust emissions by filtering and oxidating them through a regeneration process. When the diesel particulate filter is damaged, a vehicle inspection is usually performed; if the cause is not found through using on-board diagnostics, then the diesel particulate filter is removed, and a visual test is conducted. However, it is not easy to find the exact cause of the diesel particulate filter being damaged, and a visual test takes a long time as the diesel particulate filter substrate is covered by a canister. In this study, using the computed radiography X-ray imaging technique, X-ray images were taken after placing an accumulated amount of carbon powder, similar to soot and ash powder in the substrate. Results confirmed that carbon powder and ash powder were shown in white in X-ray images, leading to a conclusion that distinguishing between carbon powder and ash powder is possible by analyzing the pixel value through the image processing technique. However, since pixel values alone are insufficient for exact quantitative evaluation, various studies and analyses are necessary for quantitative evaluation.

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