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
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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.
Claims25
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, said trap having a porosity greater than 90% wherein exhaust gases undergo multiple, random turns in traveling from an upstream side to a downstream side of said trap.
An exhaust aftertreatment system for an internal combustion engine having at least one cylinder and a catalytic converter disposed in an exhaust duct of the engine which receives 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 channels through which the exhaust gas stream flows, said channels being irregular in cross-section wherein a trajectory of a centerline of said channels is random from an upstream face of said trap to a downstream face of said trap.
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 than1 kilopascal under all engine operating conditions.
An exhaust aftertreatment system for an 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 comprising a porous metallic or ceramic foam material having a plurality of irregularly shaped passages, walls of such passageways being provided by the foam material such walls being substantially thinner than such passageways.
An exhaust aftertreatment system for an 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 comprising a porous metallic or ceramic material having a plurality of irregularly shaped passages, walls of such passageways being provided by the material, wherein said material is a foam with pore size greater than 20 micrometers and average pore size greater than 80 micrometers.
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 foam material forming channels irregular in cross-section wherein a trajectory of a centerline of said channels is random from an upstream face of said trap to a downstream face of said trap.
Dependencies are inferred from the claim text.