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08 Starting and driving
08
318
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. 435).
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).
Related information
•
Economical driving (p. 318)
•
Fuel - petrol (p. 314)
•
Fuel - diesel (p. 314)
Economical driving
Driving economically means driving smoothly
while thinking ahead and adjusting your driv-
ing style and speed to the prevailing condi-
tions.
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