US 11,905,873 B1
Engine aftertreatment system
Yong Yi, Dunlap, IL (US); and Ryan Kominkiewicz, Morton, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Jul. 22, 2022, as Appl. No. 17/814,344.
Int. Cl. F01N 3/20 (2006.01); F01N 3/035 (2006.01); F01N 13/00 (2010.01); F01N 3/023 (2006.01); F01N 3/08 (2006.01)
CPC F01N 3/208 (2013.01) [F01N 3/035 (2013.01); F01N 13/009 (2014.06); F01N 3/0231 (2013.01); F01N 3/0814 (2013.01); F01N 3/0821 (2013.01); F01N 3/0871 (2013.01); F01N 3/20 (2013.01); F01N 3/2006 (2013.01); F01N 2240/16 (2013.01); F01N 2340/06 (2013.01); F01N 2550/22 (2013.01); F01N 2560/026 (2013.01); F01N 2610/02 (2013.01); F01N 2610/10 (2013.01); F01N 2900/04 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1614 (2013.01); F01N 2900/1622 (2013.01); F01N 2900/1806 (2013.01); F01N 2900/1811 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An engine exhaust aftertreatment system, comprising:
an internal combustion engine having an intake passage and an exhaust passage;
a turbocharger fluidly connected to the internal combustion engine, the turbocharger including a compressor and a turbine, the compressor being in fluid communication with the intake passage, and the turbine being in fluid communication with the exhaust passage;
a first reductant injector situated downstream of the turbocharger, wherein the first reductant injector is closely coupled to the turbocharger such that a reductant is injected into an exhaust flow of the turbocharger;
a first heating element situated downstream of the first reductant injector;
a first container downstream of the first reductant injector, the first container including a multi-functional catalyst (MFC) component;
a second reductant injector situated downstream of the first container;
a mixing component and a second heating element situated downstream of the second reductant injector; and
a second container downstream of the first container, the second container including a selective catalytic reduction (SCR) component and an Ammonia catalyst (AMOx) component.
 
16. A method of operating an engine exhaust aftertreatment system, comprising:
providing a flow of exhaust from a turbocharger;
injecting a reductant into the flow of exhaust within 5 inches downstream of the turbocharger with a first reductant injector;
after injecting the reductant, heating the flow of exhaust with a first heater;
providing the flow of exhaust to a first container including a multi-function catalyst (MFC) component;
injecting additional reductant into the flow of exhaust downstream of the first heater with a second reductant injector; and
after injecting the additional reductant, heating the flow of exhaust with a second heater.