4.7.5 Option lc
Diesel particulate filter option
The exhaust from a diesel engine contains invisible particles that are dangerous to health. The die‐
sel particulate filter reduces the amount of particles (mostly soot), protecting human health and the
environment.
The diesel particulate filter is integrated in the engine's exhaust system. The engine exhaust flows
through the filter module and nearly all the damaging particles are trapped. A control unit monitors
the function of the diesel particulate filter system.
When the filter medium has trapped a specific amount of soot, it is regenerated while the machine
is under LOAD. The control unit initiates and monitors the regeneration process. Diesel fuel is in‐
jected into the exhaust stream. This causes a special catalyst to heat the exhaust gas to over 550
°C and the soot is burnt off the filter medium in CO₂.
The machine is shut down if the back pressure in the exhaust exceeds a specific value.
General design
Fig. 14 General design of the diesel particulate filter system
1 Fuel tank
2 Diesel engine
3 Exhaust pipe with contaminated gases.
4 Diesel injection
5 Oxidizing catalytic converter
6 Filter module
7 Silencer module
8 Outlet of cleaned exhaust gas
9 Electronic control unit
a Fuel line
b Exhaust back pressure monitor
c Exhaust gas temperature monitor
The diesel particulate filter system meets the requirements of TRGS 554, TA and VERT
(Switzerland).
4.7.6 Option sa, sc, sd, sh, si
Transport options
4.7.6.1 Option sa
Chassis
The chassis has the following features:
■ Single-axle
4 Design and Function
4.7 Options
No.: 9_6974 20 E
Service manual Portable compressor
M122
43
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