VIRTUAL REDUCTANT QUALITY SENSOR

WIPO Patent Application WO/2013/003710

A3

An exhaust treatment system (200) is provided. The exhaust treatment system (200) may include a selective catalyst reduction (SCR) unit (108) for removing ΝΟχ from exhaust; a reducing agent dispensing unit for providing a reducing agent to the SCR unit (108); a first ΝΟχ sensor (202) for indicating a ΝΟχ emission level of the exhaust prior to the SCR unit (108); a second ΝΟχ sensor (204) for indicating a ΝΟχ emission level of the exhaust after the SCR unit (108), wherein at least one of the first ΝΟχ sensor (202) and the second ΝΟχ sensor (204) is a virtual ΝΟχ sensor; and a controller (110) configured to electronically communicate with a virtual sensor network (304) comprising a first virtual ΝΟχ sensor (202) and a virtual reducing agent quality sensor (208) indicating a quality index of the reducing agent according to the first ΝΟχ sensor (202) and the second NOx sensor (204).

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GRICHNIK ANTHONY J (US)
FELTY TIMOTHY J (US)
MASON JAMES R (US)

PCT/US2012/044906

March 21, 2013

June 29, 2012

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CATERPILLAR INC (US)
GRICHNIK ANTHONY J (US)
FELTY TIMOTHY J (US)
MASON JAMES R (US)

F01N9/00; F01N3/20

US20100101213A1	2010-04-29
US20090293457A1	2009-12-03
JP4319461B2	2009-08-26
US20050103000A1	2005-05-19

STANKIEWICZ, John, W. et al. (Peoria, IL, US)

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