Improvement of NOx Reduction Rate of Urea-SCR System by NH3 Adsorption Quantity Control
Date Published: 2008-10-06
Paper Number:2008-01-2498
DOI: 10.4271/2008-01-2498
Citation:
Murata, Y., Tokui, S., Watanabe, S., Daisho, Y. et al., "Improvement of NOx Reduction Rate of Urea-SCR System by NH3 Adsorption Quantity Control," SAE Technical Paper 2008-01-2498, 2008, doi:10.4271/2008-01-2498.
A urea SCR system was combined with a DPF system to reduce NOx and PM in a four liters turbocharged with intercooler diesel engine. Significant reduction in NOx was observed at low exhaust gas temperatures by increasing NH
3
adsorption quantity in the SCR catalyst. Control logic of the NH
3
adsorption quantity for transient operation was developed based on the NH
3
adsorption characteristics on the SCR catalyst. It has been shown that NOx can be reduced by 75% at the average SCR inlet gas temperature of 158 deg.C by adopting the NH
3
adsorption quantity control in the JE05 Mode.
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