Exhaust purification apparatus for engine
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United States of America Patent
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Mar 20, 2012
Grant Date -
Apr 23, 2009
app pub date -
Oct 14, 2008
filing date -
Oct 17, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust purification apparatus comprises an ammonia selective reduction-type NOx catalyst that selectively reduces NOx within exhaust gas by using ammonia as a reducing agent, a urea-water supply device that supplies urea-water into the exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst, and a control unit. The control unit controls the urea-water supply device so that the urea-water is intermittently supplied according to predetermined supply duration time and predetermined supply suspension time when the urea-water is supplied from the urea-water supply device for the purpose of providing ammonia to the ammonia selective reduction-type NOx catalyst.
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