Continuous Trap Oxidizer: Description and Operation

GF14.40-S-2010SA Component Description For Diesel Particulate Filter

ENGINES 642.8 in MODEL 906
- with CODE (MG5) Engine OM 642 DE 30 LA, 140 kW (190 hp) 3800 rpm
- except CODE (ZU7) National version for Canada
- except CODE (ZU8) National version for USA

ENGINES 642.8 in MODEL 639
- with CODE (XZ1)
- with CODE (MZ0) Blue EFFICIENCY

Illustrated on model 906






21 Muffler
114 Diesel particulate filter (DPF)
120/1 Oxidation catalytic converter


Location
The diesel particulate filter is located on the undercarriage.

Task
- The DPF filters and stores the soot particles that are generated during the combustion process.
- The DPF is the combustion chamber for combustion of soot particles during DPF regeneration.

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

Schematic diagram






81 Exhaust 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 CDI control unit (N3/30) determines the load on the DPF over the differential pressure sensor (B28/20).

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
- DPF preheating