Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jun Kawamura0
Masakuni Yokoyama0
Date of Patent
November 23, 2010
Patent Application Number
11643978
Date Filed
December 22, 2006
Patent Primary Examiner
Patent abstract
An ECU controls a rich purge in the internal combustion engine by temporarily changing an air/fuel ratio of the exhaust gas into a rich range to deoxidize and remove absorbed NOx, which is absorbed by an NOx storage and reduction catalyst of an NOx catalytic converter. The ECU changes a degree of richness of the air/fuel ratio at a time of performing the rich purge based on a state of the NOx catalytic converter.
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