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11 Technische Daten
Katalysator
11
313
Allgemeines
Die Aufgabe des Katalysators ist die Reini-
gung der Abgase. Der Katalysator ist im
Abgasstrom in der Nähe des Motors platziert,
um schnell seine Betriebstemperatur zu errei-
chen. Der Katalysator besteht aus einem
Monolithen (Keramikstein oder Metall) mit
Kanälen. Die Kanalwände sind mit einer
Schicht aus Platin, Rhodium und Palladium
versehen. Diese Metalle haben eine Katalysa-
torwirkung, d. h. sie beschleunigen die che-
mischen Reaktion, ohne hierbei selbst ver-
braucht zu werden.
Lambda-Sonde
TM
Sauerstoffsensor
Die Lambdasonde ist Teil in einem Regelsys-
tem zur Verringerung der Emissionen und
Verbesserung der Wirtschaftlichkeit.
Eine Lambdasonde (Sauerstoffsensor) über-
wacht den Sauerstoffgehalt der Abgase, die
den Motor verlassen. Der Messwert aus der
Abgasanalyse wird in einem elektronischen
System verarbeitet, welches kontinuierlich die
Einspritzventile steuert. Das Verhältnis des
dem Motor zugeführten Kraftstoff-Luft-Gemi-
sches wird fortlaufend geregelt. Diese Rege-
lung schafft zusammen mit dem Dreiwege-
Katalysator optimale Bedingungen für eine
effektive Verbrennung der Schadstoffe (Koh-
lenwasserstoffe, Kohlenmonoxid, Stickoxide).
315


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