Cummins Inc.

Cummins Ip, Inc.

Clean Diesel Technologies, Inc.

Krishna Kamasamudram

Aleksey Yezerets

Neal W Currier

Ashok Kumar

Andrew W Osburn

C Larry Bruner

Xu Chen

Michael A Smith

Cary A Henry

Edmund P Hodzen

Tamas Szailer

Fan Zeng

Shankar Kumar

Junhui Li

Ian A Package

Z Gerald Liu

Richard J Ancimer

Michael Haas

Hongbin Ma

Mark N Bays

Jinyong Luo

Michiel Makkee

Roger Fox

Walter G Copan

Michael J Cunningham

Timothy R Frazier

Mert Geveci

Timothy P Lutz

Bryon D Staebler

Alok A Joshi

Di Wang

Yadan Tang

Rohan A Siddhanthi

Neil W Currier

Askok Kumar

Prachetas A Kale

A method of recovering selective catalytic reduction catalysts relates to metal-Zeolite based catalysts. A selective catalytic reduction catalyst service event where a metal-Zeolite based selective catalytic reduction catalyst of an exhaust aftertreatment system may perform below a threshold level of performance is determined. The selective catalytic reduction catalyst then exposed to a recovery fluid selected to facilitate movement of metal ions.

Recovering deactivated metal/zeolite catalysts

Unique SCR catalyst including multiple washcoat formulations with differing performance characteristics are disclosed. One exemplary embodiment is an apparatus including a catalyst substrate defining a plurality of flow channels leading from an inlet to an outlet, a first washcoat composition distributed over a first portion of the flow channels, and a second washcoat composition distributed over a second portion of the flow channels. The first washcoat composition has a lower ammonia storage density than the second washcoat composition.

SCR exhaust aftertreatment apparatus, system and methods including multiple washcoat formulations

An internal combustion engine system includes an engine and an aftertreatment system that is connected to the engine to receive an exhaust flow from the engine. The aftertreatment system includes a contaminant storage catalyst for storing contaminants produced by the engine during cold start and low temperature operating conditions, and a NOreduction catalyst downstream of the storage catalyst for receiving the contaminants released from the storage catalyst when temperature conditions in the exhaust flow and/or NOreduction catalyst are above an effective temperature threshold for NOreduction. A contaminant amount stored on the storage catalyst can be estimated in response to one or more operating parameters to manage a storage capacity of the storage catalyst. A bypass can used to bypass the storage catalyst to preserve storage capacity for a subsequent cold start condition.

System and method for managing contaminant storage in a storage catalyst

A method and system for mitigating a urea deposit within an SCR system that includes determining a mass of an accumulated urea deposit present within the SCR catalyst and SCR piping, comparing the mass of the accumulated urea deposit with a deposit upper threshold limit, and initiating an SCR regeneration event when the mass of the accumulated urea deposit is greater than the deposit upper threshold limit. The method further includes determining an amount of NHpassing through the SCR catalyst downstream of the urea deposit, comparing the amount of NHpassing through the SCR catalyst with an NHregeneration threshold limit, and terminating the SCR regeneration event when the level of NHpassing through the SCR catalyst is less than the SCR NHregeneration threshold.

Method and system for mitigating urea deposits within an SCR catalyst system

An exhaust aftertreatment system configured to reduce nitrous oxide (NO) formation includes a first selective catalytic reduction (SCR) catalyst. The first SCR catalyst is configured for low NO formation and low ammonia (NH) storage capacity. A second SCR catalyst is positioned downstream of the first SCR catalyst. The second SCR catalyst is configured for high NHstorage capacity.

Advanced exhaust aftertreatment system architecture

A system and method are disclosed for desulfating an oxidation catalyst in an aftertreatment system of a multifuel internal combustion engine. The oxidation catalyst can be desulfated in response to one or more desulfation triggering events. The desulfation process includes providing hydrocarbons from one or all of the multiple fuel sources to an upstream oxidation catalyst. The hydrocarbons react with the exhaust gas within the upstream oxidation catalyst to deplete oxygen in the exhaust flow to thereby reduce the desulfation temperature of the oxidation catalyst while elevating a temperature of the exhaust gas to a desulfation temperature range.

Systems and methods for desulfation of an oxidation catalyst for dual fuel engines

System and methods for reducing secondary emissions in an exhaust stream from an internal combustion engine are disclosed. The systems and methods include a filtration device positioned downstream from an SCR catalyst of an aftertreatment system disposed in the exhaust system. The filtration device can also be used for particulate filter diagnostics and for treatment of ammonia slip.

Systems and methods for reducing secondary emissions from catalyst components

An apparatus includes a dosing module structured to suspend dosing in an exhaust aftertreatment system; a selective catalytic reduction (SCR) inlet NOx module structured to interpret SCR inlet NOx data and an SCR inlet temperature; a SCR outlet NOx module structured to interpret SCR outlet NOx data; and a system diagnostic module structured to determine an efficiency of a SCR system based on the SCR inlet and outlet NOx data over a range of SCR temperatures, wherein the system diagnostic module is further structured to determine a state of at least one of a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and the SCR system based on the SCR efficiency at an elevated SCR temperature range and the SCR efficiency at a relatively lower SCR temperature range relative to a high SCR efficiency threshold and a low SCR efficiency threshold.

System and method of isolating component failures in an exhaust aftertreatment system

There is disclosed method and systems for charging a depleted or spent solid storage media with gaseous ammonia.

Solid storage media charging with ammonia for use in selective catalytic reduction

System, apparatus, and methods are disclosed for treating a reduction catalyst that has been exposed to an amount of sulfur. The treating of the reduction catalyst includes providing a fluid stream at a position upstream of the reduction catalyst. The fluid stream includes a temperature and a reductant amount, and the reductant amount includes an amount of urea, ammonia, or hydrocarbons.

System, method, and apparatus for sulfur recovery on an SCR catalyst

Systems, methods, and apparatuses are provided for determining an SCR component sulfur value, determining whether the SCR component sulfur value exceeds a sulfur regeneration threshold and increasing an engine NO amount incident to an SCR catalyst in response to the SCR component sulfur value exceeding the sulfur regeneration threshold.

System, method, and apparatus for improved desulfurization of aftertreatment components

Systems, apparatus and methods are disclosed for reducing the amount of nitrous oxide (NO) produced in a selective catalytic reductant (SCR) catalyst in an exhaust aftertreatment system. The SCR catalysts are arranged to reduce the amount of NO produced during NOreduction while not adversely affecting NOconversion.

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Systems and methods for managing aftertreatment systems that include passive NOadsorption devices and SCR catalyst elements are disclosed. Temperature generation devices upstream of the passive NOadsorption devices facilitate control of the aftertreatment systems to improve fuel economy and NOconversion efficiency.

Growing community of inventors

Columbus, IN, United States of America

Krishna Kamasamudram