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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 Regel-
system zur Verringerung der Emissionen und
Verbesserung der Wirtschaftlichkeit.
Ein Sauerstoffsensor überwacht den Sauer-
stoffgehalt der Abgase, die den Motor
verlassen. Der Messwert aus der Abgasanalyse
wird in einem elektronischen System verar-
beitet, welches kontinuierlich die Einspritz-
ventile steuert. Das Verhältnis des dem Motor
zugeführten Kraftstoff-Luft-Gemisches wird
fortlaufend geregelt. Diese Regelung schafft
optimale Verhältnisse für eine effektive
Verbrennung der Schadstoffe (Kohlenwasser-
stoffe, Kohlenmonoxid, Stickoxide) mit Hilfe
eines Dreiwege-Katalysators.
246


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