US Patent No: 5,450,722

Number of patents in Portfolio can not be more than 2000

Exhaust purification device of internal combustion engine

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Abstract

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A NO.sub.x absorbent (17) is disposed in an exhaust passage of an internal combustion engine. This NO.sub.x absorbent (17) absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (17) is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (17) becomes rich. When making the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (17) rich to release the NO.sub.x from the NO.sub.x absorbent (17), the degree of richness is made larger and the time the ratio is made rich is made shorter the higher the temperature of the NO.sub.x absorbent (17).

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TOYOTA JIDOSHA KABUSHIKI KAISHAAICHI-KEN14882

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iguchi, Satoshi Mishima, JP 79 1935
Katoh, Kenji - 69 1767
Kihara, Tetsuro Susono, JP 12 922
Takeshima, Shinichi Mishima, JP 113 2158
Tanaka, Toshiaki Kitakyusyu, JP 363 4220

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (2)
5,211,010 Exhaust gas purification system for a diesel engine 23 1991
5,209,061 Exhaust gas purification system for an internal combustion engine 81 1992
 
Mitsubishi Jukogyo Kabushiki Kaisha (1)
5,343,702 Zeolite converter for diesel engine 23 1991

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, LLC (35)
6,843,051 Method and apparatus for controlling lean-burn engine to purge trap of stored NOx 1 2000
6,810,659 Method for determining emission control system operability 2 2000
6,708,483 Method and apparatus for controlling lean-burn engine based upon predicted performance impact 3 2000
6,629,453 Method and apparatus for measuring the performance of an emissions control device 4 2000
6,594,989 Method and apparatus for enhancing fuel economy of a lean burn internal combustion engine 32 2000
6,691,507 Closed-loop temperature control for an emission control device 13 2000
6,860,100 Degradation detection method for an engine having a NOx sensor 4 2001
6,694,244 Method for quantifying oxygen stored in a vehicle emission control device 9 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 16 2001
6,990,799 Method of determining emission control system operability 7 2001
6,553,757 NOx purge air/fuel ratio selection 7 2001
6,574,953 NOx purge air/fuel ratio selection 2 2001
7,168,239 Method and system for rapid heating of an emission control device 10 2002
7,111,450 Method for controlling the temperature of an emission control device 13 2002
7,032,572 Method for controlling an engine to obtain rapid catalyst heating 6 2002
6,925,982 Overall scheduling of a lean burn engine system 1 2002
6,868,827 Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device 20 2002
6,769,398 Idle speed control for lean burn engine with variable-displacement-like characteristic 34 2002
6,758,185 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 25 2002
6,745,747 Method for air-fuel ratio control of a lean burn engine 20 2002
6,735,938 Method to control transitions between modes of operation of an engine 49 2002
6,736,120 Method and system of adaptive learning for engine exhaust gas sensors 13 2002
6,736,121 Method for air-fuel ratio sensor diagnosis 49 2002
6,725,830 Method for split ignition timing for idle speed control of an engine 8 2002
6,715,462 Method to control fuel vapor purging 22 2002
6,568,177 Method for rapid catalyst heating 84 2002
6,874,490 Method and system of adaptive learning for engine exhaust gas sensors 14 2004
6,955,155 Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device 7 2004
7,059,112 Degradation detection method for an engine having a NOx sensor 12 2004
7,047,932 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 3 2004
7,069,903 Idle speed control for lean burn engine with variable-displacement-like characteristic 10 2004
 
FORD GLOBAL TECHNOLOGIES, INC. (26)
5,894,725 Method and apparatus for maintaining catalyst efficiency of a NO.sub.x trap 58 1997
5,832,722 Method and apparatus for maintaining catalyst efficiency of a NO.sub.x trap 93 1997
6,539,704 Method for improved vehicle performance 4 2000
6,499,293 Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine 9 2000
6,487,849 Method and apparatus for controlling lean-burn engine based upon predicted performance impact and trap efficiency 13 2000
6,487,850 Method for improved engine control 9 2000
6,481,199 Control for improved vehicle performance 10 2000
6,477,832 Method for improved performance of a vehicle having an internal combustion engine 13 2000
6,438,944 Method and apparatus for optimizing purge fuel for purging emissions control device 9 2000
6,434,930 Method and apparatus for controlling lean operation of an internal combustion engine 2 2000
6,427,437 Method for improved performance of an engine emission control system 6 2000
6,374,597 Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent 13 2000
6,360,530 Method and apparatus for measuring lean-burn engine emissions 7 2000
6,327,847 Method for improved performance of a vehicle 13 2000
6,308,515 Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent 15 2000
6,308,697 Method for improved air-fuel ratio control in engines 10 2000
6,370,868 Method and system for purge cycle management of a lean NOx trap 20 2000
6,389,803 Emission control for improved vehicle performance 10 2000
6,546,718 Method and system for reducing vehicle emissions using a sensor downstream of an emission control device 5 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 35 2001
6,453,666 Method and system for reducing vehicle tailpipe emissions when operating lean 3 2001
6,490,856 Control for improved vehicle performance 8 2002
 
DENSO CORPORATION (2)
6,148,612 Engine exhaust gas control system having NOx catalyst 39 1998
6,244,046 Engine exhaust purification system and method having NOx occluding and reducing catalyst 47 1999
 
MITSUBISHI DENKI KABUSHIKI KAISHA (2)
6,519,932 Exhaust gas purification apparatus and method for an internal combustion engine 4 1999
6,763,657 Exhaust gas purifying method of internal combustion engine 12 2002
 
HITACHI, LTD. (1)
6,755,015 Apparatus for purifying and controlling exhaust gases 4 2000
 
SOUTHWEST RESEARCH INSTITUTE (1)
6,679,224 Method and apparatus for operating a diesel engine under stoichiometric or slightly fuel-rich conditions 17 2001
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (1)
5,848,529 Apparatus and method for purifying exhaust gas in an internal combustion engine 53 1997

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