Exhaust gas purification apparatus for internal combustion engine
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United States of America Patent
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Feb 5, 2013
Grant Date -
May 20, 2010
app pub date -
Aug 1, 2008
filing date -
Aug 1, 2007
priority date (Note) -
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Abstract
In an exhaust gas purification apparatus for an internal combustion engine, the regeneration of a filter and the purification of NOx are made compatible with each other while suppressing an excessive supply of HC. The apparatus includes a first exhaust gas purification unit for purifying NOx, a second exhaust gas purification unit arranged in series with the first exhaust gas purification unit for collecting PM, HC supply units for supplying HC to the first exhaust gas purification unit and the second exhaust gas purification unit, respectively, and a priority decision unit for deciding priority between supplying HC to the first exhaust gas purification unit and supplying HC to the second exhaust gas purification unit, wherein an amount of HC to be supplied to a lower priority one is made smaller when a request for supplying HC to the first exhaust gas purification unit and a request for supplying HC to the second exhaust gas purification unit overlap with each other than when the HC supplying requests do not overlap with each other.
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