Automotive exhaust system
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United States of America Patent
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-
Nov 17, 1992
Grant Date -
N/A
app pub date -
Oct 8, 1991
filing date -
Oct 8, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automotive exhaust system incorporating an insulated exhaust pipe. The insulation is selected so that it is very efficient at relatively low temperatures, thereby allowing the exhaust gases to reach the light-off temperature of the catalytic converter in a short time, and less efficient at high temperatures, thereby maintaining the temperature of the exhaust gases below the level at which aging of the catalytic converter increases.
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