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08 Starting and driving
08
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* Option/accessory, for more information, see Introduction.
301
Diesel particle filter (DPF)
Diesel cars are equipped with a particle filter,
which results in more efficient emission con-
trol.
The particles in the exhaust gases are collec-
ted in the filter during normal driving. So-
called "regeneration" is started in order to
burn away the particles and empty the filter.
This requires the engine to have reached nor-
mal operating temperature.
Regeneration of the particle filter is automatic
and normally takes 10-20 minutes. It may
take a little longer at a low average speed.
Fuel consumption may increase slightly dur-
ing regeneration.
Regeneration in cold weather
If the car is frequently driven short distances
in cold weather then the engine does not
reach normal operating temperature. This
means that regeneration of the diesel particle
filter does not take place and the filter is not
emptied.
When the filter has become approx. 80% full
of particles, a yellow warning triangle is
shown in the combined instrument panel, and
the message
Soot filter full See manual is
shown in its information display.
Start regeneration of the filter by driving the
car until the engine reaches normal operating
temperature, preferably on a main road or
motorway. The car should then be driven for
approximately 20 minutes more.
NOTE
The following may arise during regenera-
tion:
•
a smaller reduction of engine power
may be noticed temporarily
•
fuel consumption may increase tem-
porarily
•
a smell of burning may arise.
When regeneration is complete the warning
text is cleared automatically.
Use the parking heater* in cold weather - the
engine then reaches normal operating tem-
perature more quickly.
IMPORTANT
If the filter is completely filled with parti-
cles, it may be difficult to start the engine
and the filter is non-functional. Then there
is a risk that the filter will need to be
replaced.
Related information
•
Fuel - handling (p. 298)
•
Fuel - diesel (p. 299)
•
Fuel consumption and CO2 emissions
(p. 417)
•
Fuel tank - volume (p. 415)
Catalytic converters
The purpose of the catalytic converters is to
purify exhaust gases. They are located close
to the engine so that operating temperature is
reached quickly.
The catalytic converters consist of a monolith
(ceramic or metal) with channels. The channel
walls are lined with a thin layer of platinum/
rhodium/palladium. These metals act as cata-
lysts, i.e. they participate in and accelerate a
chemical reaction without being used up
themselves.
Lambda-sond
TM
oxygen sensor
The Lambda-sond is part of a control system
intended to reduce emissions and improve
fuel economy. For more information, see Fuel
consumption and CO2 emissions (p. 417).
An oxygen sensor monitors the oxygen con-
tent of the exhaust gases leaving the engine.
This value is fed into an electronic system
that continuously controls the injectors. The
ratio of fuel to air directed to the engine is
continuously adjusted. These adjustments
create optimal conditions for efficient com-
bustion, and together with the three-way cat-
alytic converter reduce harmful emissions
(hydrocarbons, carbon monoxide and nitrous
oxides).
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