skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Systems and methods to reduce reductant consumption in exhaust aftertreament systems

Patent ·
OSTI ID:1343762
;

Systems, apparatus and methods are provided for reducing reductant consumption in an exhaust aftertreatment system that includes a first SCR device and a downstream second SCR device, a first reductant injector upstream of the first SCR device, and a second reductant injector between the first and second SCR devices. NOx conversion occurs with reductant injection by the first reductant injector to the first SCR device in a first temperature range and with reductant injection by the second reductant injector to the second SCR device when the temperature of the first SCR device is above a reductant oxidation conversion threshold.

Research Organization:
Cummins Inc. Columbus, IN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0004125
Assignee:
Cummins Inc.
Patent Number(s):
9,567,888
Application Number:
14/461,952
OSTI ID:
1343762
Resource Relation:
Patent File Date: 2014 Aug 18
Country of Publication:
United States
Language:
English

References (51)

Staged reductant injection for improved NO.sub.x reduction patent October 2000
Method for converting exhaust gases from a diesel engine using nitrogen oxide absorbent patent February 2001
Emission control system patent February 2001
Emission control system patent August 2001
Particulate control patent April 2005
Diesel engine system comprising a soot filter and low temperature NOx trap patent July 2005
Multistage reductant injection strategy for slipless, high efficiency selective catalytic reduction patent February 2006
Integrated NOx and PM reduction devices for the treatment of emissions from internal combustion engines patent June 2006
Exhaust system and methods of reducing contaminants in an exhaust stream patent March 2007
Catalyzed SCR filter and emission treatment system patent June 2007
Selective catalytic reduction patent September 2007
Valveless dual leg exhaust aftertreatment system patent February 2008
Plasma fuel converter NOx adsorber system for exhaust aftertreatment patent May 2008
Multi-stage system for selective catalytic reduction patent February 2009
Procedure for controlling the reducing agent in an exhaust gas post-processing system patent November 2009
Catalyst system for the reduction of NOx and NH3 emissions patent March 2010
LNT regeneration strategy over normal truck driving cycle patent March 2010
Selective catalytic reduction system patent October 2010
Catalyzed SCR filter and emission treatment system patent March 2011
SCR on low thermal mass filter substrates patent August 2011
System and method of NOx abatement patent October 2011
NOx reduction device for diesel vehicles patent April 2012
System and method for injecting ammonia into an exhaust gas stream patent October 2013
Aftertreatment system having two SCR catalysts patent April 2015
Selective catalytic reduction patent-application March 2005
Multistage Reductant Injection Strategy for Slipless, High Efficiency Selective Catalytic Reduction patent-application December 2005
Method for Remediating Emissions patent-application November 2006
Hybrid system comprising HC-SCR, NOx-trapping, and NH3-SCR for exhaust emission reduction patent-application January 2007
Narrow speed range diesel-powered engine system w/ aftertreatment device patent-application April 2007
Exhaust-gas purification system for the selective catalytic reduction of nitrogen oxides in the lean exhaust gas of internal combustion engines and method of exhaust-gas purification patent-application April 2007
Selective NOx catalytic reduction system including an ammonia sensor patent-application May 2009
Exhaust Gas Purification Device of Internal Combustion Engine patent-application December 2009
Device for Monitoring an Exhaust Gas Catalytic Converter for an Internal Combustion Engine patent-application January 2010
Emission Control System with an Integrated Particulate Filter and Selective Catalytic Reduction Unit patent-application July 2010
Emissions Treatment Systems and Methods With Catalyzed SCR Filter and Downstream SCR Catalyst patent-application July 2010
Exhaust Gas Treatment System Including a Four-Way Catalyst and Urea SCR Catalyst and Method of Using the Same patent-application September 2010
Exhaust Gas Treatment System Including a Four-Way Catalyst and Urea SCR Catalyst and Method of Using the Same patent-application September 2010
Injector Tip Cleaning Systems and Methods patent-application September 2010
Exhaust Aftertreatment System and Method of Treating Exhaust Gas patent-application October 2010
Exhaust Gas Treatment System Including a Lean Nox Trap and Two-Way Catalyst and Method of Using the Same patent-application December 2010
Methods and Systems for Control of an Emission System With More Than One SCR Region patent-application February 2011
HIGH EFFICIENCY NOx REDUCTION SYSTEM AND METHOD patent-application March 2011
DIESEL ENGINE EXHAUST TREATMENT SYSTEM patent-application June 2011
CANISTER AFTERTREATMENT MODULE patent-application June 2011
EXHAUST SYSTEM FOR A LEAN BURN IC ENGINE patent-application July 2011
METHOD AND APPARATUS FOR COLD STARTING AN INTERNAL COMBUSTION ENGINE patent-application August 2011
AMMONIA SENSOR CONTROL OF AN SCR AFTERTREATMENT SYSTEM patent-application November 2011
SYSTEM, METHOD, AND APPARATUS TO ENGAGE ALTERNATE REDUCTANT IN A NOX REDUCTION SYSTEM patent-application February 2012
LNT and SCR Catalysts for Combined LNT-SCR Applications patent-application August 2012
SELECTIVE CATALYTIC REDUCTION (SCR) DEVICE CONTROL SYSTEM patent-application March 2013
SYSTEMS AND METHODS FOR NOx REDUCTION AND AFTERTREATMENT CONTROL USING PASSIVE NOx ADSORPTION patent-application September 2015

Similar Records

Related Subjects

42 ENGINEERING
33 ADVANCED PROPULSION SYSTEMS