US 12,345,184 B2
Diesel engine aftertreatment system
Joshua L. Ratts, Pine Village, IL (US); and Robert D. Clayton, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Aug. 2, 2023, as Appl. No. 18/229,469.
Prior Publication US 2025/0043711 A1, Feb. 6, 2025
Int. Cl. F01N 11/00 (2006.01); F01N 3/021 (2006.01); F01N 3/28 (2006.01); F01N 13/00 (2010.01)
CPC F01N 11/002 (2013.01) [F01N 3/021 (2013.01); F01N 3/2892 (2013.01); F01N 13/0097 (2014.06); F01N 2550/02 (2013.01); F01N 2550/04 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An apparatus for aftertreatment for an engine, comprising:
a housing having an inlet, an outlet and defining a cavity therein;
a plurality of tubes mounted within the cavity and arranged to define a multi-flow split arrangement to pass an exhaust flow of the engine through the plurality of tubes; and
a plurality of treatment units configured to treat the exhaust flow within the housing, wherein each of the plurality of treatment units is coupled within a corresponding one of the plurality of tubes to receive a portion of the exhaust flow, and wherein a number of the plurality of treatment units utilized to treat the exhaust flow within the housing is less than a number of the plurality of tubes such that at least one of the plurality of tubes does not contain one of the plurality of treatment units;
wherein the at least one of the plurality of tubes that does not contain one of the plurality of treatment units includes a restriction device that defines an orifice that is configured to restrict another portion of the exhaust flow through the at least one of the plurality of tubes and wherein the orifice remains open during conditions in which no exhaust flow is passing through the plurality of tubes.