Exhaust emission control apparatus and method for internal...

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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Details

C060S274000, C060S297000, C060S301000, C060S303000

Reexamination Certificate

active

06922988

ABSTRACT:
An exhaust emission control apparatus for an internal combustion engine is capable of suppressing a nasty smell due to the hydrogen sulfide generated upon recovery from SOx poisoning. The exhaust emission control apparatus includes an NOx storage-reduction catalyst, a reducing agent supplying section for supplying a reducing agent to the NOx catalyst, an SOx poisoning recovering section for recovering the NOx catalyst from its SOx poisoning by varying the oxygen concentration of an exhaust by means of reducing agent supplying section, a hydrogen sulfide concentration estimating section for estimating a concentration of hydrogen sulfide in an atmosphere into which the hydrogen sulfide is discharged, and an estimated concentration derived reducing agent supply amount control section for decreasing an amount of reducing agent to be supplied in accordance with the increasing concentration of hydrogen sulfide estimated by the hydrogen sulfide concentration estimating section while the NOx catalyst is recovered from the sulfur oxide poisoning.

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patent: 6145303 (2000-11-01), Strehlau et al.
patent: 6574955 (2003-06-01), Schroder et al.
patent: 6588205 (2003-07-01), Kumagai et al.
patent: 6637198 (2003-10-01), Hertzberg
patent: 6854266 (2005-02-01), Schnaibel et al.
patent: 198 27 195 A 1 (1999-12-01), None
patent: 198 51 843 A 1 (2000-05-01), None
patent: A 2000-161045 (2000-06-01), None
patent: A 2000-274232 (2000-10-01), None
patent: A 2002-38932 (2002-02-01), None
patent: A 2003-166415 (2003-06-01), None
patent: WO 01/00976 (2001-01-01), None

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