7-76 BA 35203_04 * 3.0 * 35203_04_07_Wartung.fm
7 Maintenance
Diesel oxidation catalytic converter (DOC) with diesel particulate
filter (DPF) (option)
The exhaust after-treatment C is a closed system consisting of the diesel
oxidation catalytic converter (DOC) with the diesel particulate filter (DPF)
option.
The soot produced when combusting diesel fuel is collected in the diesel
particulate filter.
The filter is automatically regenerated during engine operation as the soot
load increases. This means that the soot is burned in the diesel particulate
filter.
The combustion (regeneration) of the soot is a continuous process that
automatically starts as soon the conditions required for it (soot load and
exhaust-gas temperature) are fulfilled.
The loading of the diesel particulate filter is electronically monitored.
If automatic regeneration should not be possible for different reasons, the
system indicates (by means of symbols and warning lights in the digital
display) that manual regeneration is necessary
– see “Monitoring of the diesel particulate filter (DPF) (optional)” on
page 7-78 and Manual regeneration on page 7-84.
Ash is also collected during the combustion of soot, however it is not
eliminated by regeneration.
This results in shorter regeneration intervals, which ultimately requires the
replacement of the diesel particulate filter during maintenance.
The ash and soot load may appear in % in the digital display by means of
a query.
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