Emission control apparatus of internal combustion engine
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United States of America Patent
Stats
-
Mar 2, 2004
Grant Date -
Jun 13, 2002
app pub date -
Dec 3, 2001
filing date -
Dec 8, 2000
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A NOx occluding member that occludes NOx when the air-fuel ratio is on the fuel-lean side is disposed in an engine exhaust passage. An NOx ammonia sensor is disposed in the engine exhaust passage downstream of the NOx occluding member. A surplus amount of a reducing agent that is not used to release NOx is determined from a change in the ammonia concentration detected by the NOx ammonia sensor when the air-fuel ratio is changed to the fuel-rich side so as to release the NOx from the NOx occluding member.
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