LAPSE

LAPSE:2019.0413
Published Article
LAPSE:2019.0413
A New Dynamic Injection System of Urea-Water Solution for a Vehicular Select Catalyst Reduction System
Long Li, Wei Lin, Youtong Zhang
March 15, 2019
Since the Euro-ІІІ standard was adopted, the main methods to inhibit NOx production in diesel engines are exhaust gas recirculation (EGR) and select catalyst reduction (SCR). On these methods SCR offers great fuel economy, so it has received wide attention. However, there also exists a trade-off law between NOx conversion efficiency and NH₃ slip under dynamic conditions. To inhibit NH₃ slip with high NOx conversion efficiency, a dynamic control method for a urea water solution (UWS) injection was investigated. The variation phenomena of SCR conversion efficiency with respect to the cross-sensitivity characteristics of the NOx sensor to NH₃ have been thoroughly analyzed. The methodology of “uncertain conversion efficiency curve tangent analysis” has been applied to estimate the concentration of the slipped NH₃. The correction factor “φ” of UWS injection is obtained by a comparative calculation of the NOx conversion ability and subsequent NH₃ slip. It also includes methods of flow compensation and flow reduction. The proposed control method has been authenticated under dynamic conditions. In low frequency dynamic experiments, this control method has accurately justified the NH₃ slip process and inhibits the NH₃ emission to a lower level thereby improving the conversion efficiency to a value closer to the target value. The results of European transient cycle (ETC) experiments indicate that NH₃ emissions are reduced by 90.8% and the emission level of NOx is close to the Euro-Ѵ standard.
Keywords
dynamic correction, NH3 slip, select catalyst reduction (SCR), urea water solution (UWS)
Subject
Suggested Citation
Li L, Lin W, Zhang Y. A New Dynamic Injection System of Urea-Water Solution for a Vehicular Select Catalyst Reduction System. (2019). LAPSE:2019.0413
Author Affiliations
Li L: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Lin W: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhang Y: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
[Login] to see author email addresses.
Journal Name
Energies
Volume
10
Issue
1
Article Number
E12
Year
2016
Publication Date
2016-12-23
Published Version
ISSN
1996-1073
Version Comments
Original Submission
Other Meta
PII: en10010012, Publication Type: Journal Article
Record Map
Published Article

LAPSE:2019.0413
This Record
External Link

doi:10.3390/en10010012
Publisher Version
Download
Files
[Download 1v1.pdf] (2.7 MB)
Mar 15, 2019
Main Article
License
CC BY 4.0
Meta
Record Statistics
Record Views
0
Version History
[v1] (Original Submission)
Mar 15, 2019
 
Verified by curator on
Mar 15, 2019
This Version Number
v1
Citations
Most Recent
This Version
URL Here
http://psecommunity.org/LAPSE:2019.0413
 
Original Submitter
Calvin Tsay
Links to Related Works
Directly Related to This Work
Publisher Version