Exhaust gas purification method for internal combustion engine
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United States of America Patent
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Aug 15, 2006
Grant Date -
Jul 10, 2003
app pub date -
Dec 30, 2002
filing date -
Jan 8, 2002
priority date (Note) -
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Abstract
To obtain an exhaust gas purification method for an internal combustion engine for detecting timing at which an inflow NOx amount flowing into an NOx absorption catalyst exceeds an NOx amount processable by the NOx absorption catalyst, and enriches the air/fuel ratio to prevent deterioration of the exhaust gas and maintain good fuel consumption. Based on an NOx amount absorbed in the NOx absorption catalyst and a maximum NOx absorption amount NOx of the absorption catalyst, a processable NOx amount processable by the NOx absorption catalyst per unit time is calculated and compared with the inflow NOx amount entering the NOx absorption catalyst per unit time, and when it is determined that the inflow NOx amount is greater, the air/fuel ratio is switched to rich.
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