Apparatus for controlling exhaust concentration
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
May 14, 1992
filing date -
May 14, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A NOx reducing catalyst can most efficiently remove both NOx and HC when concentrations of NOx and HC in exhaust have a specified relationship between them. For this purpose, an apparatus is adapted to control the concentrations of NOx and HC at an upstream of a catalyst to have a specified relationship. Sensors for detecting the concentration of NOx and HC are arranged at an upstream side of the catalyst. Additionally, a device for levelling a quantity of HC discharge is disposed to suppress variation thereof.
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