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300 Exhaust cleaning
is called active regeneration and consists of heating the
filter so that the particles are burnt.
The particulate filter also removes inorganic
contaminants (ash) which comes from engine oil
additives. Ash cannot be burnt, so regular service of
the particulate filter is necessary. To obtain the
maximum service interval and best function, it is
recommended that engine oils with low ash content,
VDS-4 or VDS–3 LSA are used. The above named
system informs the driver
when a predetermined level of ash particles have
accumulated in the particulate filter.
The particulate filter greatly reduces the emission of
soot particulates (PM), hydrocarbons (HC) and carbon
monoxide (CO). A proportion of the nitrogen oxides
(NO
) in the exhaust gases from the engine are
x
converted in the catalytic converter to nitrogen dioxide
(NO
), which helps to burn the soot particulates which
2
are caught by the filter. The total content of NO
the engine is not altered, but the proportion of NO
increased. The NO
2
irritate the respiratory passages and aggravate asthma.
However, the particulate filter does contribute to a
considerably improved environment on account of its
capacity to considerably reduce the quantity of soot
particulates, hydrocarbons and carbon monoxide.
High content of soot particles in the
particulate filter
Automatic regeneration of the particulate filter
There are two types of regeneration: automatic and
manual. Automatic regeneration (see below) is
performed while driving, manual regeneration when
the vehicle is stationary.
When regeneration of the filter is necessary, a symbol
is shown to the right and the message "Request
regeneration" in the display. See also section "ATS" in
the Driver's handbook.
can, in moderate concentrations,
from
x
is
2
J3018100
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