NOx decreasing apparatus for an internal combustion engine
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United States of America Patent
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Feb 14, 1995
Issued Date -
N/A
app pub date -
Sep 10, 1993
filing date -
Oct 29, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
In an exhaust purification apparatus of an internal combustion engine having an NOx absorption and release material in an exhaust conduit, a heater is provided close to the NOx absorption and release material. When an NOx absorption operation continues for a predetermined period, the heater is switched on to raise the temperature of the NOx absorption and release material above a predetermined temperature, for example, 500.degree. C. When the temperature of the NOx absorption and release material is high, the NOx absorption and release material releases absorbed NOx and is regenerated.
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