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11 Technische Daten
250
Katalysator
11
Allgemeines
Die Aufgabe des Katalysators ist die Reini-
gung der Abgase. Der Katalysator ist im Ab-
gasstrom in der Nähe des Motors platziert, um
schnell seine Betriebstemperatur zu erreichen.
Der Katalysator besteht aus einem Monolithen
(Keramikstein oder Metall) mit Kanälen. Die
Kanalwände sind mit einer Schicht aus Platin,
Rhodium und Palladium versehen. Diese Me-
talle haben eine Katalysatorwirkung, d. h. sie
beschleunigen die chemischen Reaktion,
ohne hierbei selbst verbraucht zu werden.
Lambda-Sonde
TM
Sauerstoffsensor
Die Lambdasonde ist Teil in einem Regelsys-
tem zur Verringerung der Emissionen und Ver-
besserung 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 optimale Verhältnisse für eine ef-
fektive Verbrennung und sorgt zusammen mit
dem Dreiwege-Katalysator für eine Verringe-
rung der Schadstoffemissionen (Kohlenwas-
serstoffe, Kohlenmonoxid, Stickoxide).
251


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