In order to maintain the prescribed emission limit values, a diesel particulate filter that is also known as DPF is used in vehicles with diesel engines.
The diesel particulate filter comprises a ceramic structure that has a honeycomb structure where the surface technology has been coated with precious metals.
Currently two DPF systems are mainly used.
With additive and without additive.
The DPF system filters harmful soot particles from the engine exhaust gases.
Once certain driving conditions are reached, the regeneration process is started automatically. In doing so, the filter is regenerated by burning the soot particles retained at high temperature.
The DPF system is equipped with a regeneration system.
Here one can differentiate between two different
processes (active and passive regeneration).
Due to the positioning of the filter (near to the engine), the emission temperatures are reached that are required for the regeneration process
(no additive required).
When traveling on the motorway, this is also generally carried out every 400 – 800 km.
Attention: interrupting the cleaning process
may lead to serious engine damage.
Depending on the vehicle type, a warning lamp my illuminate during the regeneration. In this case, continue driving until the warning lamp goes out.
If the warning lamp flashes or continues illuminating, regeneration of the filter is not possible. In this case, you should visit a specialist garage immediately (in order to avoid engine damage).
The ash produced when burning the soot particles remains in the filter.
When the filter is saturated with ash, the filter must be cleaned or if necessary, renewed.
Important safety information
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