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11 Technische Daten
Katalysator
11
307
Allgemeines
Die Aufgabe des Katalysators ist die Reinigung
der Abgase. Der Katalysator ist im Abgasstrom
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
Metalle 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 zusammen mit dem Dreiwege-
Katalysator optimale Bedingungen für eine
effektive Verbrennung der Schadstoffe (Koh-
lenwasserstoffe, Kohlenmonoxid, Stickoxide).
307


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