Exhaust gas purifier for use in internal combustion engine
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Sep 21, 2000
filing date -
Jan 21, 1999
priority date (Note) -
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Abstract
When a NOx-releasing unit is operated to change an air-fuel ratio to a rich side to thereby establish a low-oxygen-concentration atmosphere of an exhaust gas such that NOx is released from a NOx catalyst, a reducer-supplying unit 33 additionally supplies a reducer during an operating period of the NOx-releasing unit for reducing NOx released into an exhaust path such that release of NOx balances with reduction of NOx, thereby reducing NOx released from the NOx catalyst and thus suppressing worsening of exhaust gas performance.
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