- Functions of Exhaust Solution System 

1. To ensure the best performance of the engine , combustion exhaust gas delivered to the engine safely at the same time ;

2. Reduce exhaust noise generated by the engine to meet the requirements of regulations and customers ;

3. Reduce or eliminate the pollutants generated by engine combustion in order to meet regulations and customer requirement .

- Technical Types  : Selective Catalytic Reduction ( SCR )

Introduction : SCR is a NOx control technique for diesel engine exhaust. In other words, the reducing agent ammonia or AdBlue® is sprayed to reduce NOx in the tail gas to N2 and H2O under the action of catalyst .

- Components 

1. AdBlue® supply device : AdBlue® tank ,AdBlue® sensor , AdBlue® hose and etc.

2. Air supply device : Air tank , oil & air filter , PA hose and etc.

3. System heating device : Coolant control valve , EPDM hose , AdBlue® sensor and etc.

4. Exhaust catalytic reduction device :Exhaust gas processor , exhaust pipe and etc.

5. System control device :DCU , NOx sensor , catalyst input temperature sensor , catalyst output temperature sensor and etc.

- System work principle :

The AdBlue® is stored in a chassis mounted tank. The tank supplies the solution to a dosing unit ( DU ) which is also chassis mounted. The DU is electronically controlled by the dosing control unit ( DCU ) which relates to the engine control module ( ECM ) . The DU uses compressed air supplied from the vehicle system to atomize the AdBlue® and by means of a very accurate pumping and metering system , supplies a spray nozzle in the engine's exhaust system.

The amount of AdBlue® injected into the exhaust is controlled by the DCU and matched to the NOx output of the engine at any given speed and load condition . Wter evaporated quickly and the AdBlue® turns into ammonia when in contact with hot exhaust gases .The ammonia reacts with NOx over the catalyst convertor and the resultant tailpipe emission from this process is harmless nitrogen (N2) and water (H20) .