Quote:
Originally Posted by Phantom
"Catalytic converters generally function efficiently only when the incoming mixture is within about 4% of stoichiometry, or a lambda range from .96 to 1.04. Let's return to our last example above. At 1.03, lambda is narrowly within acceptable lean limits. But if this borderline lean condition persists over a long period of time, the catalyst will slowly degrade as a result of the excessive heat it generates while cleaning up the exhaust stream."
From http://www.austincc.edu/wkibbe/lambda.htm |
The hyperlink you quoted is all about lean-burn, or misfire condition cause by
engine troubles. Such case will not apply to DCD, BECAUSE, AS I HAVE
MENTIONED MANY TIMES, DCD CONTAINS NO LEAN-BURN. Therefore, there
will be no un-burned HC to heat the cat.
Lean-burn will cause high lambda, but high lambda of DCD is never caused
by lean-burn, instead, it is caused by air injected into exhaust, by oxygen
diluting, resulting a cooler temperature. Why run hot and burn the cat?
Where's the energy comes from? If oxygen could generate heat, why the
engines need to burn gas? Just burn oxygen according to your thinking.
Hope the above will pull you out from the dead zone of lean-burn. Anything
related to lean-burn is not related to DCD, AND will not apply to DCD.