A urea SCR system was combined with a DPF system to reduce NOx and PM in a four-liter turbocharged intercooler diesel engine. Significant reduction in NOx was observed at low exhaust gas temperatures by increasing the 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 in the SCR catalyst. It has been shown that NOx can be reduced by 75% at an average SCR inlet gas temperature of 158 deg C by adopting an NH 3 adsorption quantity control in the JE05 mode.
|Review of Automotive Engineering
|Published - 2009
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