DIESEL PARTICULATE FILTER CONSTRUCTION/OPERATION[MZ-CD 1.6 (Y6)]
id0116c3151200
High Power-Euro 4
• The diesel particulate filter is located behind the catalyst, pointing in the direction of exhaust gas flow. The catalytic converter and diesel particulate filter are integrated into one housing.
• The diesel particulate filter is a honeycomb structure, the walls of which are made of porous silicon carbide In addition, the individual ducts are sealed at one side and offset to each other.
• Soot particles, which may still be present in the exhaust gas after combustion, are filtered as follows: the exhaust gases charged with soot particles flow into the diesel particulate filter and, because of the offset sealed ducts, are forced to flow through the porous walls.
• The build up of soot particles in the intermediate chambers of the porous walls increases the filtration effect still further.
|
1
|
Catalyst exhaust gas temperature sensor installation hole
|
|
2
|
Diesel particulate filter differential pressure pipe (inside)
|
|
3
|
Diesel particulate filter differential pressure pipe (outside)
|
|
4
|
To diesel particulate filter differential pressure sensor
|
|
5
|
Catalytic converter
|
|
6
|
Diesel particulate filter
|
Diesel Particulate Filter element
-
• The diesel particulate filter element is a honeycomb structure in which the walls of the structure are made of porous silicon carbide (composition of carbon with metal). The individual ducts are sealed at one end of the element and offset at the other.
• As the exhaust gases with the soot particles and fuel additive are filtered/forced through the porous walls (due to the offset sealed ducts), the soot particles and additive are stuck to the walls of the element. This process occurs until a large build up of soot particles and fuel additive attached to the porous walls increases the exhaust gas pressure in front of the diesel particulate filter, which is monitored by the diesel particulate filter differential pressure sensor for diagnostic purposes.
• The regular regeneration of soot particulates stored in the diesel particulate filter leads to a build up of stored ash (by-product of the regeneration process). This build up reduces the usable volume within the diesel particulate filter in which soot is stored between regenerations, thus shortening the regeneration interval (as calculated by the PCM). For this reason the diesel particulate filter must be replaced at the scheduled service interval.
|
1
|
Diesel particulate filter
|
|
2
|
Exhaust gas flow
|
|
3
|
Sealed ducts
|
|
4
|
Porous walls
|
|
5
|
Filtered soot particles and fuel additive
|
