Catalyst applied on Engine has both closed coupled Lean NOx Trap (LNT), also known as NOx adsorbers, and Diesel Partifulate Filter (DPF). The LNT which are incorporated into the catalyst washcoat, chemically bind NOx during lean engine condition. When the LNT capacity is saturated, the system is regenerated during a period of rich engine operation and the released NOx is reduced to Nitrogen (N2) over the catalyst.

The overall cycle of operation is :

- NO reacts with oxygen on active oxidation catalyst sites to form NO2

- Adsorption of NO2 by the storage material in the form of barium nitrate.

- Once exhaust is switched to the rich condition, oxygen is replaced by reducing species, including hydrocarbons, carbon monoxide (CO), and hydrogen (H2).

- When the engine runs under excessive fuel conditions or at elevated temperatures, the nitrate species become thermodynmically unstable and decompose, producing NO or NO2.

- Under rich conditions, the nitrogen oxides are reduced to N2 over the reduction catalyst.

Diesel Particulate Filter (DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas. It accumulates the PM and burns off the accumulated PM by elevating exhaust temperature to soot combustion temperature (Approx. 550℃ ~ 650℃ / 1,022℉ ~ 1,202℉). It can be accomplished manually(Filter regeneration in "Vehicle Software Management" with GDS) or automatically(Driving vehicle with high speed).