US Patent No: 6,026,640

Number of patents in Portfolio can not be more than 2000

Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means

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Importance

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Abstract

In a method of controlling an exhaust gas system of an internal combustion engine including a nitrogen oxide reducing catalyst capable of adsorbing nitrogen oxide under a lean atmosphere and a nitrogen oxide sensor disposed downstream of the nitrogen oxide reducing catalyst, the nitrogen oxide reducing catalyst and the nitrogen oxide sensor are disposed in the exhaust gas system operated mainly under a lean condition, respectively. An output value of the nitrogen oxide sensor is compared with a predetermined value, and an operation condition of the internal combustion engine is temporarily changed into a stoichiometric condition or a rich condition, or a fuel is injected upstream of the nitrogen oxide reducing catalyst, so that the nitrogen oxide adsorbed to the nitrogen oxide reducing catalyst is detached or decomposed, and again the internal combustion engine is operated under the lean condition.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NGK INSULATORS, LTD.NAGOYA3086

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kato, Nobuhide Ama-Gun, JP 87 1160
Kurachi, Hiroshi Nagakute-Gun, JP 20 369

Cited Art

Patent Info (Count) # Cites Year
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (4)
5,483,795 Exhaust purification device of internal combustion engine 100 1994
5,715,679 Exhaust purification device of an engine 83 1996
5,735,119 Exhaust purification device of an engine 78 1996
5,713,199 Device for detecting deterioration of NO.sub.x absorbent 97 1996
 
DAIMLER AG (1)
5,771,686 Method and apparatus for operating a diesel engine 104 1996
 
ISUZU MOTORS LIMITED (1)
5,410,873 Apparatus for diminishing nitrogen oxides 94 1993

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, LLC (11)
6,810,659 Method for determining emission control system operability 2 2000
6,691,507 Closed-loop temperature control for an emission control device 11 2000
6,860,100 Degradation detection method for an engine having a NOx sensor 2 2001
6,694,244 Method for quantifying oxygen stored in a vehicle emission control device 5 2001
6,691,020 Method and system for optimizing purge of exhaust gas constituent stored in an emission control device 2 2001
6,650,991 Closed-loop method and system for purging a vehicle emission control 2 2001
6,615,577 Method and system for controlling a regeneration cycle of an emission control device 20 2001
6,604,504 Method and system for transitioning between lean and stoichiometric operation of a lean-burn engine 6 2001
6,553,754 Method and system for controlling an emission control device based on depletion of device storage capacity 13 2001
6,990,799 Method of determining emission control system operability 7 2001
7,059,112 Degradation detection method for an engine having a NOx sensor 10 2004
 
FORD GLOBAL TECHNOLOGIES, INC. (10)
6,360,530 Method and apparatus for measuring lean-burn engine emissions 7 2000
6,308,515 Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent 15 2000
6,546,718 Method and system for reducing vehicle emissions using a sensor downstream of an emission control device 5 2001
6,539,706 Method and system for preconditioning an emission control device for operation about stoichiometry 1 2001
6,502,387 Method and system for controlling storage and release of exhaust gas constituents in an emission control device 11 2001
6,490,860 Open-loop method and system for controlling the storage and release cycles of an emission control device 7 2001
6,487,853 Method and system for reducing lean-burn vehicle emissions using a downstream reductant sensor 7 2001
6,467,259 Method and system for operating dual-exhaust engine 44 2001
6,463,733 Method and system for optimizing open-loop fill and purge times for an emission control device 32 2001
6,453,666 Method and system for reducing vehicle tailpipe emissions when operating lean 3 2001
 
ROBERT BOSCH GMBH (3)
6,324,834 Running of an internal combustion engine in conjunction with an NOx-accumulator catalytic converter 12 1999
6,389,802 Method and arrangement for operating an internal combustion engine in combination with an NOx storage catalytic converter and an NOx sensor 13 1999
6,758,034 Method for operating an internal combustion engine 1 2002
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (2)
6,694,724 Exhaust emission control apparatus of internal combustion engine and control method of the same 16 2002
8,132,450 Malfunction diagnosis device for exhaust gas purification system and malfunction diagnosis method therefor 0 2009
 
CUMMINS, INC. (1)
8,215,098 Method and apparatus for diagnosing exhaust gas aftertreatment component degradation 0 2005
 
HITACHI, LTD. (1)
6,357,224 Engine exhaust gas purifying apparatus 11 2000
 
INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC (1)
8,006,484 Systems and methods for reducing emissions of internal combustion engines using a fuel processor bypass 0 2005
 
JOHNSON MATTHEY PUBLIC LIMITED COMPANY (1)
7,861,516 Methods of controlling reductant addition 4 2004
 
NGK SPARK PLUG CO., LTD. (1)
6,309,536 Method and apparatus for detecting a functional condition on an NOx occlusion catalyst 13 1998
 
NISSAN MOTOR CO., LTD. (1)
6,167,695 Method and system for diagnosing deterioration of NOx catalyst 30 1999
 
SIEMENS AKTIENGESELLSCHAFT (1)
6,247,303 Method and device for removing oxidic noxious substances in an oxygen-containing exhaust gas and engine which is operated therewith 14 1999
 
VOLKSWAGEN AG (1)
6,705,078 Method and device for controlling a NOx storage catalyst that is arranged in an exhaust gas channel of a combustion engine 4 2002