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Catalytic converter
11
General
The purpose of the catalytic converter is to
purify exhaust gases. It is located in the flow
of exhaust gases close to the engine so that
it quickly reaches operating temperature. The
catalytic converter consists of a monolith
(ceramic or metal) with channels. The chan-
nel walls are lined with a thin layer of plati-
num, rhodium and palladium. These metals
act as catalysts, 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.
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. Together with the
three-way catalytic converter, these adjust-
ments create optimal conditions for efficient
combustion of the harmful emissions (hydro-
carbons, carbon monoxide and nitrous ox-
ides).