SHOP MANUAL
Engine
Ch 1 page 28
Explanation
In order to reduce the concentrations of nitrogen oxide compounds (NOx) in the exhaust gases, catalytic con-
verters are used and reductant (32.5% urea and the rest water) is delivered into the exhaust gases in the hydro-
lysis catalytic converter. When the exhaust gases have been treated in the SCR catalytic converter water (H2O),
carbon dioxide (CO2) and nitrogen (N2) come out of the exhaust pipe.
Figure 41 is a principle drawing of the components carrying out exhaust gas aftertreatment.
1. Hydrolysis catalytic converter with reductant doser. Reductant is added, evaporated and mixed with the
exhaust gases.
2 Reductant tank and reductant pump to deliver reductant to the reductant doser.
3 SCR catalytic converter that converts nitrogen oxide compounds into nitrogen and water.
The exhaust gas aftertreatment processes are monitored and activated by the exhaust gas aftertreatment con-
trol unit EEC3 which is controlled by the engine control unit EMS.
Figure 41
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