System for minimizing the impact of poisoning of automotive exhaust aftertreatment systems
AssigneeFord Global Technologies, LLC
InventorsJeffrey Scott Hepburn, Carolyn Parks Hubbard, Gang Guo, Lifeng Xu, Robert Walter McCabe
Life of this patent
Estimating the term…
Abstract
An exhaust aftertreatment system for an internal combustion engine is disclosed which mitigates deleterious poisoning of a catalytic converter or exhaust gas oxygen sensor by phosphorus containing species.
Claims31
An exhaust aftertreatment system for a reciprocating internal combustion engine having at least one cylinder and a catalytic converter disposed in an exhaust duct of the engine which receives an exhaust gas stream from the engine, comprising a trap disposed in the exhaust duct located upstream of the catalytic converter, said trap is comprised of a porous ceramic or metallic material having a predetermined average pore size, said trap substantially fills the cross-section of the exhaust duct, a volume of said trap is less than 10% of a swept volume of the engine's cylinders coupled to said trap, wherein exhaust gases undergo multiple, random turns in traveling from an upstream side to a downstream side of said trap.
The exhaust aftertreatment system of claim 10, wherein said trap is treated with a washcoat capable of catalyzing oxidation reactions of carbon monoxide and hydrocarbons in said exhaust gases.
An exhaust aftertreatment system for a spark-ignition, reciprocating internal combustion engine having a catalytic converter disposed in an exhaust duct of the engine, comprising a trap disposed in the exhaust duct located upstream of the catalytic converter, said trap is comprised of a porous material substantially filling the cross-section of the exhaust duct, said porous material is comprised of a ceramic or metallic foam and has an average pore size greater than about 80 micrometers, said porous material has randomly oriented passageways forcing exhaust gases passing through said porous material to undergo multiple turns.
An exhaust aftertreatment system for a multi-cylinder, reciprocating internal combustion engine having a catalytic converter disposed in an exhaust duct of the engine, comprising a trap disposed in the exhaust duct located upstream of the catalytic converter, said trap is comprised of a metallic or ceramic porous material substantially filling the cross-section of the exhaust duct with randomly oriented passages through said porous material, a pressure difference between an upstream side and a downstream side of said phosphorus trap is less than 1 kilopascal under all engine operating conditions.
An exhaust aftertreatment system for processing exhaust gases from a reciprocating internal combustion engine, comprising a catalytic converter disposed in an exhaust duct of the engine, said catalytic converter has channels for conducting exhaust gases from an upstream end of said catalytic converter to a downstream end of said catalytic converter, said channels are substantially parallel to each other and parallel to a direction of flow through said catalytic converter, said catalytic converter has a ceramic or metallic porous material disposed within said channels from said upstream end of said catalytic converter for a predetermined distance along said catalytic converter, said porous material has randomly oriented passageways, the exhaust gases undergo multiple turns in the course of being transmitted through said porous material.
An exhaust aftertreatment system for a reciprocating internal combustion engine, comprising:
- a phosphorus trap disposed in an exhaust duct of the engine, said trap is comprised of a porous material substantially filling the cross-section of the exhaust duct, said porous material has an average pore size greater than a predetermined pore size, said porous material has randomly oriented passageways forcing exhaust gases passing through said porous material to undergo multiple turns so that phosphorous containing materials are trapped in said phosphorous trap;
- a catalytic converter disposed in said exhaust duct of the engine located downstream of said phosphorus trap;
- and
- an electronic control unit operably connected to the engine, said electronic control unit provides an indication of an amount of said trapped phosphorous and raises temperature in said phosphorous trap above a predetermined temperature when said amount of phosphorous containing material exceeds a predetermined quantity.
Dependencies are inferred from the claim text.