Exhaust gas purification apparatus of internal combustion engine
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United States of America Patent
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-
May 13, 2003
Grant Date -
Jun 7, 2001
app pub date -
Dec 6, 2000
filing date -
Dec 6, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An upstream-side catalyst is provided at a location in close to an exhaust manifold of an engine. An HC absorbent and a downstream-side catalyst are installed in series at the downstream side. With the upstream-side catalyst put in an inactive state, the HC absorbent absorbs HC having passing through the upstream-side catalyst. After the upstream-side catalyst has been activated, HC released from the HC absorbent is refluxed to the upstream side of the upstream-side catalyst through a reflux path to be removed by the upstream-side catalyst. At that time, the ECU executes catalyst-early-warming control right after an engine start in order to raise the temperature of the upstream-side catalyst at an early time so as to shorten the time it takes to activate the upstream-side catalyst.
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