New Buses | After Treatments – Exhaust Technology

19 10 2011

After treatment / regeneration of exhaust gases is reality, here is some data from our regeneration process guides 

Your vehicle has been equipped with an exhaust after treatment device. It consists of an oxidation catalyst (DOC) and a particulate filter (DPF).

Most of the soot particles containing carbon and ash are captured in the DPF. The accumulated carbon disappears if the particulate filter is heated to the self-cleaning temperature (approx. 570°F). Once this temperature is reached, the carbon reacts with the nitrogen dioxide and burns to become carbon ioxide.  This process is called regeneration.

If the regeneration happens while driving, it is called automatic regeneration.  However, if the self-cleaning temperature is not reached while driving (e.g. due to frequent stopping), you have to intervene to make the regeneration take place. To this end, go for a ride driving at high speed (highway) during at least 20 minutes or carry out a stationary regeneration.  A symbol appears on the multifunctional display if you have to intervene to make the regeneration take place.



During a regeneration, the exhaust temperature can amount to 1500°F.

The high exhaust temperature can cause material in the flow of the exhaust pipe to start burning. Stay clear of the exhaust, burns hazard!


To inhibit/interrupt regeneration:

If regeneration causes hazardous situations (e.g. at a stop), you can inhibit/interrupt the regeneration process. To this end, press the upper part of the

DPF regeneration switch.

Appropriate location for stationary regeneration

• Surface that will not start to burn or to melt under high temperatures (such

as clean concrete; no grass or asphalt!);

• Away from anything that can burn, melt or explode;

• Not near gas or vapors that can ignite, explode or contribute to a fire (such as LPG, diesel vapors, …).

Safety area around exhaust • If bystanders can access the area, set up barriers at least 5 ft away from the exhaust.

• If regeneration takes place in a confined space, connect an exhaust gas

evacuation system to the exhaust pipe. The evacuation system has to

resist temperatures of at least 1500°F.

• Keep a fire extinguisher nearby.


For more information please visit our site




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