Exhaust gas purifying apparatus for internal combustion engine and controller for internal combustion engine
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United States of America Patent
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-
Dec 11, 2001
Grant Date -
N/A
app pub date -
Apr 28, 2000
filing date -
Jun 8, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When deterioration of a NOx purifying device due to sulfur contamination is detected, a specific operating state flag FHL is set to '1,' and, at intervals equal to or shorter than, for example, three seconds, the air-fuel ratio of an air-fuel mixture to be supplied to an engine is varied so that it is alternately leaner and richer than the stoichiometric air-fuel ratio. When the temperature TCAT of the NOx purifying device exceeds a deterioration recovery temperature STCAT2 while the air-fuel ratio variation control is being executed, the SOx removing flag FHLSOx is set to '1,' and for a period equivalent to the deterioration recovery time TRSOx, the air-fuel ratio is maintained richer than the stoichiometric air-fuel ratio.
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