Various embodiments of an apparatus, system, and method are disclosed for controlling NO
x conversion in a selective catalytic reduction (SCR) system. According to one …

An apparatus includes a nitrogen oxide (NOx) module and a selective catalytic reduction
(SCR) diagnostic module. The NOx module is in exhaust gas communication with an …

For example, according to one representative embodiment, an apparatus for reducing NO x
emissions in an engine exhaust includes a NO x reduction target module configured to …

BACKGROUND Emissions regulations for internal combustion engines have become more
stringent over recent years. The regulated emissions of NO, and particulates from internal …

A system includes an engine, an exhaust conduit for the engine, a first SCR catalyst fluidly
coupled to the exhaust conduit, and a second SCR catalyst fluidly coupled to the exhaust …

Various embodiments of an apparatus, system, and method are disclosed for manipulating
the properties of engine exhaust at least partially through the engine's control system to …

BACKGROUND The technical field generally relates to internal combustion engine
technology. More particularly but not exclusively, the present application relates to an …

According to one embodiment, described herein is an exhaust gas after-treatment system
that is coupleable in exhaust gas stream receiving communication with an internal …

US PATENT DOCUMENTS 5,552,128 A 9/1996 Chang et al. 6,109,024 A 8/2000 Kinguasa
et al. 6,125,629 A 10, 2000 Patchett 6,182,443 B1 2/2001 Jarvis et al. 6,266.955 B1 7/2001 …

(57) ABSTRACT A method includes determining a current mid-bed NH amount by operating
an NH sensor positioned at a mid-bed location for an engine aftertreatment system having …