Engine exhaust gas purifying apparatus
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United States of America Patent
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-
Mar 19, 2002
Grant Date -
N/A
app pub date -
Jun 12, 2000
filing date -
Jun 10, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides a method of controlling an air-fuel ratio and for diagnosing a deterioration of a catalyst having an NOx trapping agent in an internal combustion engine. An exhaust gas purifying apparatus having an NOx trapping agent arranged within an exhaust gas passage, an air-fuel ratio changing means temporarily changing the air-fuel ratio of the exhaust gas from the lean to the stoichiometric or rich air-fuel ratio at a predetermined cycle, a particular component detecting means detecting a particular component in the exhaust gas downstream the NOx trapping agent, a NOx discharge or reduction completion judging means, and NOx discharge or reduction completion time detecting means detecting a time required for purifying the NOx.
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