US Patent No: 6,925,796

Number of patents in Portfolio can not be more than 2000

Diagnosis of a urea SCR catalytic system

ALSO PUBLISHED AS: 20050103000

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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, MI5509

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nieuwstadt, Michiel van Ann Arbor, MI 11 43
Upadhyay, Devesh Canton, MI 47 398

Cited Art Landscape

Patent Info (Count) # Cites Year
 
NISSAN MOTOR CO., LTD. (3)
6,185,929 Exhaust emission control system for internal combustion engine 20 1999
6,167,695 Method and system for diagnosing deterioration of NOx catalyst 30 1999
6,145,305 System and method for diagnosing deterioration of NOx-occluded catalyst 25 1999
 
FORD GLOBAL TECHNOLOGIES, INC. (2)
6,112,518 System and method for monitoring a catalytic converter 10 1999
6,305,160 Emission control system 24 1999
 
NGK INSULATORS, LTD. (2)
5,953,907 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means 53 1997
6,134,883 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means 68 1999
 
CATERPILLAR INC. (1)
5,709,080 Leak detection method and apparatus for an exhaust purification system 19 1996
 
HITACHI AMERICA, LTD. (1)
5,426,934 Engine and emission monitoring and control system utilizing gas sensors 90 1993
 
HITACHI, LTD. (1)
6,434,928 Apparatus and method of purification of exhaust emission of internal combustion engine 19 2000
 
ROBERT BOSCH GMBH (1)
6,216,451 Method of diagnosing an NOx storage catalytic converter during operation of an internal combustion engine 31 1999
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (1)
5,201,802 Exhaust gas purification system for an internal combustion engine 127 1992

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HONEYWELL INTERNATIONAL INC. (7)
7,878,178 Emissions sensors for fuel control in engines 6 2008
8,620,461 Method and system for updating tuning parameters of a controller 0 2009
8,504,175 Using model predictive control to optimize variable trajectories and system control 1 2010
8,109,255 Engine controller 4 2010
RE44452 Pedal position and/or pedal change rate for use in control of an engine 0 2010
8,265,854 Configurable automotive controller 2 2011
8,360,040 Engine controller 3 2012
 
FORD GLOBAL TECHNOLOGIES, LLC (3)
8,516,798 Methods and systems for control of an emission system with more than one SCR region 0 2009
8,240,194 Methods and systems for diagnostics of an emission system with more than one SCR region 2 2009
8,661,882 Methods and systems for diagnostics of an emission system with more than one SCR region 0 2012
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (3)
7,133,755 State of health monitoring and fault diagnosis for integrated vehicle stability system 15 2004
7,376,499 State-of-health monitoring and fault diagnosis with adaptive thresholds for integrated vehicle stability system 14 2005
8,555,613 Model-based diagnostics of NOx sensor malfunction for selective catalyst reduction system 1 2009
 
CUMMINS, INC. (1)
8,590,290 Methods, systems, and apparatuses of SCR diagnostics 0 2009
 
DENSO CORPORATION (1)
7,886,521 Diagnosis device of exhaust purification catalyst 2 2007
 
INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC (1)
7,980,064 Algorithm incorporating driving conditions into LNT regeneration scheduling 0 2007

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