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Son, Geon Seog
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PM Reduction in Diesel Exhaust Gases with a Photocatalytic DPF Reactor

GM Daewoo Auto & Technology-Soong Kee Kim, Ki Kyoung Bae
Neophotech Inc-Geon Seog Son, Cheon Seog Gwak, Eui Rak Choi, Cheol Won Hwang
Published 2006-04-03 by SAE International in United States
The tightening of diesel emissions legislation throughout the EU and US is leading to the development of emission control devices to enable diesel engines to meet the standards. One system which has shown great promise in controlling PM emissions is Diesel Particulate Filter (DPF). Even DPF has showed good filtering efficiency, it has also lots of challenge for serial applications. One of the challenges is regeneration of filtered PM at urban driving condition. Since the temperatures are much lower than those of PM oxidation by itself. Active systems are proposed to ensure the regeneration along variable driving conditions. In this study, Photocatalyst-Plasma and Honeycomb (PPH) is proposed as an active and continuous regeneration system of DPF on the road. The results show a good feasibility of PPH system for PM regeneration with lower power consumption without an increasing pressure on the DPF.
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A study of the aging of photocatalysts

Institute for Advanced Engineering-Geon Seog Son, Seong Hyuk Ko, Kwi Young Lee
  • Technical Paper
  • 2000-05-0323
Published 2000-06-12 by Society of Automotive Engineers of Korea in South Korea
To reduce cold-start emissions that is a bottleneck of tightened regulation, a photocatalyst was suggested and studied. Conventional TWC can reduce more than 96% of harmful emissions after the activation, but under a cold-start condition it needs a lot of energy to activate. During the activation time (light-off time) harmful gases are exhausted without any purification and it makes the conventional TWC difficult to satisfy tightened regulation. A photocatalyst can be activated by light that has wavelengths lower than 380 nano-meters. The activation needs no time and loss of energy like a TWC.To apply the photocatalyst on a vehicle aftertreatment a photocatalyst system was suggested that uses non-thermal plasma as a light source of photocatalyst. The durability of a photocatalyst was also studied with hydrothermal aging method. The properties of aged catalyst were tested with surface area, phase transformation and conversion efficiency of HC.

Hydrocarbon adsorber systems for the LEV program

Daewoo Motors Ltd.-Eu Rak Choi
Institute for Advanced Engineering-Geon Seog Son, Sung Hyuk Ko, Dae Jung Kim, Kwi Young Lee
  • Technical Paper
  • 1999-08-0366
Published 1999-07-13 by Society of Automotive Engineers of Japan in Japan
Hydrocarbon adsorber is considered as a promising technology to reduce cold-start HCs in automotive exhaust gas. In this study, three in-line adsorber systems were tried to reduce the cold-start emission. To check the basic characteristics of the adsorbers, surface area, temperature programmed adsorption/desorption were examined after a hydrothermal aging. Also idle engine bench was used to know the adsorption and desorption capabilities of the adsorber systems at cold start. Finally, a practicability of the adsorber systems for the LEV program was checked with FTP test on a 2.0D M/T vehicle. The results of this study indicate that hydrocarbon adsorber system is one of the promising passive technologies for ULEV regulations.

A Study on the Practicability of a Secondary Air Injection for Emission Reduction

Daewoo Motor Co.-Eui Rak Choi, Young Woong Kim
Institute for Advanced Engineering-Geon Seog Son, Dae Jung Kim, Kwi Young Lee
Published 1999-05-03 by SAE International in United States
In this study, feasibility tests of secondary air injection technology and lean A/F control technology were performed for LEV program using the FTP75 test on a 2.0 DOHC A/T vehicle. Second-by-second emissions and temperatures were evaluated. The temperatures of exhaust gas were measured at exhaust manifold, front of warm up, and the center of warm up converter. At first, amount of secondary air injection was determined with a bench aged warm up converter and a fresh UCC. And then, the performances of secondary air injection and lean A/F control strategy were compared with 80,000km vehicle aged converters(warm up converter, UCC). Both secondary air injection and lean A/F control technologies satisfied the ULEV regulation. This study shows that the lean A/F control strategy can be one of the potential technologies to meet the LEV/ULEV regulations without an active system that need a cost up.
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