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Technische Daten
Katalysator
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/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 Lambda-Sonde ist Teil in einem Regelsys-
tem zur Verringerung der Emissionen und Ver-
besserung der Wirtschaftlichkeit.
Ein Sauerstoffsensor überwacht den Sauer-
stoffgehalt der Abgase, die den Motor verlas-
sen. Der Messwert aus der Abgasanalyse wird
in einem elektronischen System verarbeitet,
welches kontinuierlich die Einspritzventile steu-
ert. Das Verhältnis des dem Motor zugeführten
Kraftstoff-Luft-Gemisches wird fortlaufend
geregelt. Diese Regelung schafft optimale
Verhältnisse für eine effektive Verbrennung der
Schadstoffe (Kohlenwasserstoffe, Kohlenmon-
oxid, Stickoxide) mit Hilfe eines Dreiwege-
Katalysators.
251


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