In order to fulfill future emission standards for middle and heavy-duty vehicles like state Ⅳ and Ⅴ, advanced measures on exhaust gas and engine functionality are required. Selective Catalytic Reduction (SCR) technology is the unique technology currently which can improve the emission and reduce fuel consumption simultaneously. Firstly the reductants and its chemical reactions, SCR system configurations and its working principle and urea dosing control strategy are introduced. Then tests are conducted on a diesel engine with SCR system at bench. The results of ESC cycle show that NOx emission is decreased by more than 67% with the open-loop control strategy. Additionally, the urea and fuel consumption and ammonia leakage have been compared and analyzed respectively, the experiment data indicates that the urea water solution consumption ratio is only 5.7% of fuel for this SCR system, while its average ammonia slip is below 5 ppm.
[1]
M. Elsener,et al.
Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines
,
2000
.
[2]
Martin Elsener,et al.
Recent Advances in the Development of Urea-SCR for Automotive Applications
,
2001
.
[3]
Howard L. Fang,et al.
Urea thermolysis and NOx reduction with and without SCR catalysts
,
2003
.
[4]
Martin Elsener,et al.
NOx-Reduction in Diesel Exhaust Gas with Urea and Selective Catalytic Reduction
,
1996
.
[5]
Fpt Frank Willems,et al.
Optimization of urea SCR deNOx systems for HD diesel engines
,
2004
.