Diagnosis of a urea SCR catalytic system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6925796
APP PUB NO 20050103000A1
SERIAL NO

10716137

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Abstract

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A method for diagnosing degradation in a pair of NOx sensors coupled upstream and downstream of a NOx catalyst is presented. The method is performed when catalyst temperature is such that its NOx conversion efficiency is substantially zero, such as when the catalyst temperature is very low (at cold start) or very high (e.g., following regeneration). Under those conditions, sensor degradation can be diagnosed if the upstream and downstream NOx sensor readings are not substantially the same.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FORD GLOBAL TECHNOLOGIES, LLCDEARBORN, MI8588

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nieuwstadt, Michiel van Ann Arbor, MI 9 75
Upadhyay, Devesh Dearborn, MI 37 590

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ROBERT BOSCH GMBH (1)
6216451 Method of diagnosing an NOx storage catalytic converter during operation of an internal combustion engine 32 1999
 
NISSAN MOTOR CO., LTD. (3)
* 6185929 Exhaust emission control system for internal combustion engine 20 1999
6167695 Method and system for diagnosing deterioration of NOx catalyst 30 1999
* 6145305 System and method for diagnosing deterioration of NOx-occluded catalyst 25 1999
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (1)
5201802 Exhaust gas purification system for an internal combustion engine 127 1992
 
FORD GLOBAL TECHNOLOGIES, INC. (2)
* 6112518 System and method for monitoring a catalytic converter 13 1999
6305160 Emission control system 25 1999
 
CATERPILLAR INC. (1)
5709080 Leak detection method and apparatus for an exhaust purification system 21 1996
 
HITACHI, LTD. (1)
* 6434928 Apparatus and method of purification of exhaust emission of internal combustion engine 20 2000
 
HITACHI AMERICA, LTD. (1)
* 5426934 Engine and emission monitoring and control system utilizing gas sensors 92 1993
 
NGK INSULATORS, LTD. (2)
* 5953907 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means 54 1997
* 6134883 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means 69 1999
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
DENSO CORPORATION (2)
* 7886521 Diagnosis device of exhaust purification catalyst 3 2007
* 2008/0092,524 Diagnosis device of exhaust purification catalyst 3 2007
 
ROBERT BOSCH GMBH (2)
* 9494073 Method and device for monitoring the function of an exhaust-gas sensor 0 2011
* 2013/0269,316 METHOD AND DEVICE FOR MONITORING THE FUNCTION OF AN EXHAUST-GAS SENSOR 0 2011
 
CUMMINS INC. (3)
8590290 Methods, systems, and apparatuses of SCR diagnostics 0 2009
* 2011/0047,964 METHODS, SYSTEMS, AND APPARATUSES OF SCR DIAGNOSTICS 2 2009
9038369 Systems and methods for aftertreatment system diagnostics 0 2013
 
HONEYWELL INTERNATIONAL INC. (8)
7878178 Emissions sensors for fuel control in engines 10 2008
8620461 Method and system for updating tuning parameters of a controller 1 2009
8504175 Using model predictive control to optimize variable trajectories and system control 2 2010
8109255 Engine controller 8 2010
RE44452 Pedal position and/or pedal change rate for use in control of an engine 7 2010
8265854 Configurable automotive controller 11 2011
8360040 Engine controller 14 2012
9170573 Method and system for updating tuning parameters of a controller 0 2013
 
FORD GLOBAL TECHNOLOGIES, LLC (6)
8516798 Methods and systems for control of an emission system with more than one SCR region 5 2009
8240194 Methods and systems for diagnostics of an emission system with more than one SCR region 4 2009
* 2011/0023,591 METHODS AND SYSTEMS FOR DIAGNOSTICS OF AN EMISSION SYSTEM WITH MORE THAN ONE SCR REGION 10 2009
* 2011/0023,463 METHODS AND SYSTEMS FOR CONTROL OF AN EMISSION SYSTEM WITH MORE THAN ONE SCR REGION 16 2009
8661882 Methods and systems for diagnostics of an emission system with more than one SCR region 0 2012
9304061 Methods and systems for diagnostics of an emission system with more than one SCR region 0 2013
 
CUMMINS EMISSION SOLUTIONS, INC. (2)
9109493 sensor 2 2010
9388728 sensor diagnostics 0 2013
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (4)
* 7133755 State of health monitoring and fault diagnosis for integrated vehicle stability system 23 2004
* 2006/0020,379 State of health monitoring and fault diagnosis for integrated vehicle stability system 3 2004
* 7376499 State-of-health monitoring and fault diagnosis with adaptive thresholds for integrated vehicle stability system 25 2005
8555613 Model-based diagnostics of NOx sensor malfunction for selective catalyst reduction system 2 2009
 
ISUZU MOTORS LIMITED (2)
* 8973431 conversion efficiency degradation 0 2011
* 2013/0306,171 APPARATUS FOR DIAGNOSING CAUSES OF NOX CONVERSION EFFICIENCY DEGRADATION 3 2011
 
INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC (2)
7980064 Algorithm incorporating driving conditions into LNT regeneration scheduling 1 2007
* 2008/0314,031 Algorithm incorporating driving conditions into LNT regeneration scheduling 8 2007
* Cited By Examiner

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