Component description for the diesel particulate filter

P49.10-2515-05

Illustrated on Model 203.0

18 Primary catalytic converter

19 Catalytic converter

21 Muffler

114 Diesel particulate filter (DPF)

Location

The DPF is located at the center in the vehicle underfloor.

Task

The diesel particulate filter filters, stores and burns the soot particles that are generated during the combustion process.

Design

The diesel particulate filter consists of a ceramic honeycomb filter body out of silicon carbide, which is coated with rare metal platinum. The passages of the diesel particulate filter are opened alternatively at front and rear and are separated from each other through the porous filter walls of the honeycomb filter body.

P14.40-2027-06

81 Exhaust gas flow

82 Ceramic monolith

83 Plug

84 Insulation

85 Housing

Function

The unfiltered exhaust gas flows through the porous ceramic honeycomb filter of the DPF.

The soot particles are physically retained in the honeycomb filter body of the DPF. For regeneration of the DPF, the vehicle load of the DPF is determined by the exhaust gas pressure upstream and downstream of the DPF. The signals are evaluated by the differential pressure sensor (DPF) (B28/8) and transmitted to the CDI control unit(N3/9).

Temperatures above 600°C are necessary for soot oxidation which are not obtained during normal operation of the diesel engine. For this purpose, the CDI control unit can take the following measures to increase the exhaust gas temperature:

 Intake air throttling

 Late injection

 Diesel particle filter glowing