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Technische Daten
Katalysator
Katalysator
Der Katalysator ist Bestandteil der Abgas-
anlage und sorgt für die Reinigung der Abgase.
Er besteht hauptsächlich aus einem Gehäuse
mit zwei Monolithen, durch dessen Kanäle die
Abgase geleitet werden. Die Kanalwände sind
mit einer dünnen Schicht aus Platin, Rhodium
und Palladium versehen. Diese Metalle haben
eine Katalysatorwirkung, d. h., sie sind Teil
einer chemischen Reaktion und beschleunigen
diese, ohne hierbei selbst verbraucht zu werden.
Lambda-Sonde
TM
(Sauerstoffsensor,
nur bei Benzinmotoren)
Die Lambda-Sonde ist Teil in einem Regel-
system zur Verringerung der Emissionen und
Verbesserung des Wirkungsgrads. Ein Sauer-
stoffsensor überwacht den Sauerstoffgehalt der
Abgase, die den Motor verlassen. Der Meßwert
aus der Abgasanalyse wird in einem elektroni-
schen System verarbeitet, welches kontinu-
ierlich die Einspritzventile steuert. Das
Verhältnis des dem Motor zugeführten Kraft-
stoff-Luft-Gemisches wird fortlaufend geregelt.
Diese Regelung schafft optimale Verhältnisse
für eine effektive Verbrennung der Schadstoffe
(Kohlenwasserstoffe, Kohlenmonoxid, Stick-
oxide) mit Hilfe eines Dreiwege-Katalysators.
209


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