The Study of NOx Reduction using Urea-SCR System with CPF and DOC for Light Duty Vehicle; the Diesel NOx Reduction System Hyundai-Motor Company

Format:

Conference/Event

Author/Creator:

Joo, Kihyung, author.

Conference Name:

SAE World Congress & Exhibition (2008-04-14 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2008

Summary:

Future emission limits of diesel engines require additional effort to develop advanced after-treatment devices. The Urea-SCR system is a promising device to reduce NOx emissions. The purpose of this work is to reduce NOx emissions from a Light Duty Vehicle (LDV) with a Urea-SCR (Selective Catalytic Reduction) system, a Catalytic Particulate Filter (CPF), and a Diesel Oxidation Catalyst (DOC). The purpose of the development is to analyze the atomization characteristics of the urea solution and to optimize the flow path shape in front of the SCR catalyst for uniform reductant (NH3) distribution. Additionally, the development purpose is to determine the strategy for urea solution injection quantity and to verify the performance of the Urea-SCR system on the vehicle. The NO2/NOx ratio plays a pivotal role in reducing NOx with Urea-SCR system. Although NO is converted into NO2 through the DOC, the NO2/NOx ratio is reduced due to the CRT (continuous regenerating trap) effect in the CPF. Therefore, the reduced NO2 ratio has a negative influence on the NOx reducing efficiency of the Urea-SCR system. The negative factors associated with the reduced NO2 amount is an increase in accumulated PM (Particulate Matter) and in the number of associated CPF regeneration times needed. Through this work the Urea-SCR system has shown an 80 percent NOx conversion during the FTP75 driving mode on a transient engine test bench

Notes:

Vendor supplied data

Publisher Number:

2008-01-1183

Access Restriction:

Restricted for use by site license