Abstract
Keywords -Diesel Engine, Catalyst, Aftertreatment, Urea SCR, NOx
A urea SCR system was combined with a DPF system to reduce NOx and PM in a four litters turbocharged with intercooler diesel engine. Significant reductions in NOx were observed at low exhaust gas temperatures by increasing NH3 adsorption quantity in the SCR catalyst. NH3 adsorption control logic was developed for transient operation based on the NH3 adsorption characteristics. 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 NH3 adsorption control in the JE05 Mode.