BA 50Z3/6003 en – Edition 4.3 * 5003b520.fm 5-17
Maintenance
How the diesel particulate filter works
The machine is equipped with a closed diesel particulate filter with passive regeneration,
active diesel fuel injection and a catalytic converter installed before the filter.
Passive regeneration
The special coating of the diesel particulate filter lowers the ignition temperature of the die-
sel soot and ensures that the soot burns on its own including at low exhaust gas tempera-
tures. Consequently, the soot particles retained by the diesel particulate filter are
continuously burnt.
Active diesel fuel injection
If output requirements are low, the exhaust gas temperatures of the diesel engine are too
low to ensure passive regeneration. The soot particles cannot be burnt and form deposits
in the filter. If a certain pressure threshold is crossed and the temperature is briefly higher,
the controls activate diesel fuel injection for a short time. This causes the temperatures in
the filter to rise and makes regeneration possible.
Catalytic converter
In addition to sufficiently high temperature, soot regeneration also requires enough NOx.
However, the exhaust gas of the new environment friendly diesel engines does not always
contain enough NOx under all operating conditions. Therefore, a catalytic converter is
installed before the filter to avoid any such shortcomings.
Control box
The control box monitors and saves the temperature and the pressure in the particulate fil-
ter system, transmits the data to the display and controls diesel fuel injection.
Condensate trap
The condensate trap protects the control box against damage caused by water by elimi-
nating the condensation water in the pressure line.
Injection nozzle
The injection nozzle is controlled by the control box and if required, injects diesel fuel into
the exhaust pipe in front of the particulate filter.
Machine operation with diesel particulate filter
The following points explain how machine operation with a diesel particulate filter differs
from operation without such a filter:
Dangers
The particulate filter, its piping and the exhaust gas can reach very high
temperatures. Therefore, always keep a safe distance from these elements
and let the machine cool down before performing inspection or maintenance
work.
Machine capacity
During normal machine operation, exhaust gas temperatures are sufficiently high to
ensure continuous passive regeneration of the particulate filter. However, if the machine is
operated at low capacity, the continuous passive regeneration stops and the exhaust gas
back pressure in the diesel particulate filter rises. Diesel fuel injection is activated as soon
as a certain pressure threshold is crossed and a higher exhaust gas temperature is
reached for a short time.
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