The particulate filter comprises a beehive-shaped ceramic body. It has been sub-divided into a number of small channels arranged in parallel, which have been arranged alternately. The following gases are contained in the exhaust gas: carbon monoxide, carbon dioxide, nitrogen oxides, hydrocarbons, sulphur dioxide (all shown blue). Further, soot particles (red) and an additive (yellow).
- Insertion of the various gas and soot particles into the middle tube.
- Gas particles can escape through the pores of the side wall into the two tubes next to this, whereas the soot and additive remain in the medium tube as a result of their size.
- Gas particles can escape to the back into the exhaust pipe.