Advantages of Coated Gasoline Particulate Filters in the CC2 Position for China 6B Umicore Autocat (China) Co Limited

Format:

Book

Conference/Event

Author/Creator:

Weiwei, Gu, author.

Contributor:

Ball, Douglas

Meng, Xiangwei

YANG, CHEN

Zhao, Lei

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Gasoline Particulate Filter (GPF), which is universally acknowledged as the most reliable and high cost-performance emission control technology for particulate mass (PM) and particulate number (PN). It is modified by coating with washcoat that would greatly boost its TWC performance (THC/CO/NOx reducing), while back pressure (BP) and filtration efficiency (FE) might be influenced. Comparing with uncoated GPF, cGPF is dominant in Chinese OEMs for China 6B market to survive from stringent emission limit and RDE requirement. cGPF is usually set up at close-coupled position (CC2) for better working temperature, or underfloor position (UFC) for lower back pressure in China 6B system layout design. In this study, a four cylinder China 6b calibrated 1.6L TGDI (turbo gasoline direct injection) vehicle was used to evaluate various catalyst combinations in the close-coupled and underfloor locations. In the close-couple 1 position (CC1), PGM loadings were varied on a 1L TWC. Next in the close-coupled 2 position (CC2), coated and uncoated 1.3L GPF's were evaluated. PGM loading was varied on the cGPFs using 300/8 high porosity substrates. The uncoated GPFs used a 200/8 low porosity substrates. In the underfloor location, PGM loadings were varied on two 0.5L TWC catalyst. All of the catalysts were aged using 4-mode aging to simulate 200,000km of road aging. A total of eight catalyst combinations were evaluated using the WLTC cycle on the 1.6L vehicle. Gaseous emissions were measure after each catalyst to determine the minimum PGM and catalyst volume that is necessary to meet our China 6B emission targets. In addition to gaseous emissions, particle number, particle mass and system back pressures were measured. Results indicate that cGPF are necessary for CO and NOx emission reduction and lower auto-regeneration temperatures (500 oC) were observed. We also recognized that coated GPF have higher BP especially in phase3 and phase4 acceleration step during WLTC cycle, but the impact to fuel consumption and the engine operation parameters are very small

Notes:

Vendor supplied data

Publisher Number:

2021-01-0587

Access Restriction:

Restricted for use by site license