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11 Caractéristiques
Pot catalytique
11
283
Généralités
Le rôle du pot catalytique est d'épurer les gaz
d'échappement. Il est placé dans le flux de gaz
d'échappement pour atteindre rapidement la
température de fonctionnement. Ce pot cata-
lytique se compose d'un monolithe (céramique
ou métal) avec des canaux. Les parois de ces
canaux sont recouvertes d'une fine couche de
platine/rhodium/palladium. Ces métaux agis-
sent comme des catalyseurs, c'est-à-dire
qu'ils accélèrent la réaction chimique sans être
consommés.
Sonde Lambda chauffée
TM
sonde
d'oxygène
Le sonde lambda fait partie d'un système de
régulation ayant pour tâche de réduire les
émissions de gaz d'échappement et d'amélio-
rer le rendement du carburant.
Un capteur d'oxygène surveille la teneur en
oxygène dans les gaz d'échappement rejetés
par le moteur. La valeur résultant de l'analyse
des gaz d'échappement est transmise au sys-
tème électronique qui contrôle en permanence
les injecteurs de carburant. Le rapport entre
l'air et le carburant admis vers le moteur est
ajusté en continu. Cette régulation permet
d'obtenir des conditions optimales de com-
bustion qui, avec le pot catalytique trois voies,
réduisent l'émission des substances dange-
reuses (hydrocarbures, monoxyde de carbone
et oxydes d'azote).
284


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