Emissions control system for increasing selective catalytic...

Details Emissions control system for increasing selective catalytic... Emissions control system for increasing selective catalytic...

2005-03-29

2005-03-29

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S278000, C060S288000, C060S301000, C060S287000

Reexamination Certificate

active

06871490

ABSTRACT:
An emissions control system is used with a compression ignition engine capable of producing an exhaust gas stream to be treated by a reduction agent which is mixed with the exhaust gas stream to convert the exhaust gas stream prior to being directed into an SCR catalyst capable of reducing NOx in the exhaust gas stream. An exhaust gas recirculation valve is associated with the compression ignition engine for directing the exhaust gas stream back into the compression ignition engine. An electronic control unit and sensors determine whether the temperature of the exhaust gas stream is at a predetermined temperature, and if so control operation of the valve to allow a portion of the exhaust gas stream to be directed into the SCR catalyst. A bypass valve may also be provided to prevent the exhaust gas stream from entering into the SCR catalyst.

REFERENCES:
patent: 5643536 (1997-07-01), Schmelz
patent: 6209317 (2001-04-01), Hirota
patent: 6427439 (2002-08-01), Xu et al.
patent: 6446430 (2002-09-01), Roth et al.
patent: 6502391 (2003-01-01), Hirota et al.
patent: 6615580 (2003-09-01), Khair et al.

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