Particulate l
ter
Please refer to at the start of the
chapt
er on page 299.
Diesel engines
Regeneration function
During regeneration of the particulate filter,
the accumulated soot inside the filter is
burnt to ash so that it does not become
clogged. Regeneration takes place at peri-
odic intervals at high temperatures. In order
to achieve the high temperatures in the
particulate filter, additional diesel is injec-
ted into the engine which is burnt in the
diesel oxidation catalytic converter, thus al-
lowing the regeneration.
Depending on the driver’s driving profile
and the load placed on the engine, the
amount of diesel fuel injected is continu-
ously adjusted to maintain a high tempera-
ture in the particulate filter during regener-
ation. During the post-injection of diesel,
small amounts of diesel may enter the oil
circuit in the engine. The diesel will evapo-
rate from the engine oil again during regular
driving. If the engine oil temperatures are
not high enough due to the driving profile,
or if you drive a lot of short distances, the
diesel cannot evaporate from the engine oil
and this can cause oil thinning.
An indicator lamp may light up on the in-
strument cluster display → page 335.
Automatic regeneration
The soot in the particulate filter is burnt o
at high temperatures on a periodic basis.
To assist the regeneration of the particulate
filter, avoid making only short trips.
The radiator fan may run on while the vehi-
cle is moving or when the engine has been
switched o.
Regeneration is interrupted automatically
when the vehicle is driven in the reserve
range and the yellow indicator lamp
lights up.
NOTICE
If regeneration is not completed, this can
thin the oil and c
ause engine damage.
·
Do not switch o the engine unnec
essari-
ly while the indicator lamp is active.
·
Avoid frequent short trips and driving cy-
cles at continuously low engine speeds
or while stationary.
Noises, smells and increased engine
speeds ma
y occur during regenera-
tion.
Petrol engines
Function
The particulate filter (depending on the ve-
hicle equipment) filters out soot particles
in the exhaust gas.
Regeneration
In normal vehicle operation, the filter
cleans itself. If it is not possible for the filter
to clean itself, for example if the vehicle is
only ever used for short trips, the filter will
become saturated with soot. The diesel
particulate filter requires cleaning (regener-
ation).
Noises, slight smells and increased engine
speeds may occur during regeneration. The
radiator fan may run on while the vehicle is
moving or when the engine has been
switched o.
To assist the regeneration of the particulate
filter, avoid making only short trips.
The soot in the particulate filter is
burnt o at high temperatures on
a periodic basis. During the periodic regen-
eration process, the yellow indicator lamp
does not light up.
Troubleshooting
Please refer to at the start of the
chapt
er on page 299.
Particulate l
ter clogged with
soot
The indicator lamp lights up yellow.
T
he particulate filter is saturated with soot
and requires regeneration.
Prerequisite for regeneration trip: the en-
gine is at operating temperature.
304 Fuel and emission control