US Patent No: 5,551,231

Number of patents in Portfolio can not be more than 2000

Engine exhaust gas purification device

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Abstract

An exhaust gas purification device comprising a three way catalyst, an oxidizing catalyst and a NOx absorbent which are arranged in this order in the exhaust passage. A rich air-fuel mixture is burned in the combustion chamber, and secondary air is supplied upstream of the three way catalyst so as to make the air-fuel ratio of the exhaust gas flowing into the three way catalyst a rich air-fuel ratio greater than the air-fuel ratio of the air-fuel mixture burned in the combustion chamber. Further, secondary air is supplied upstream of the oxidizing catalyst to make the air-fuel ratio of the exhaust gas flowing into the oxidizing catalyst and the NOx absorbent slightly leaner than the stoichiometric air-fuel ratio.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TOYOTA JIDOSHA KABUSHIKI KAISHAAICHI-KEN12954

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Itou, Takaaki Mishima, JP 66 1355
Kunitake, Kazuhisa Susono, JP 5 131
Ohnaka, Hidemi Susono, JP 15 260
Takeda, Keiso Mishima, JP 59 706
Tanahashi, Toshio Susono, JP 80 1075
Tanaka, Hiroshi Asaka, JP 855 5288

Cited Art

Patent Info (Count) # Cites Year
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (3)
5,235,956 Secondary air feed device of an engine 14 1992
5,433,074 Exhaust gas purification device for an engine 82 1993
5,388,406 NOx decreasing apparatus for an internal combustion engine 52 1993

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, LLC (37)
6,843,051 Method and apparatus for controlling lean-burn engine to purge trap of stored NOx 0 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 3 2000
6,594,989 Method and apparatus for enhancing fuel economy of a lean burn internal combustion engine 30 2000
6,691,507 Closed-loop temperature control for an emission control device 10 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
7,168,239 Method and system for rapid heating of an emission control device 8 2002
7,111,450 Method for controlling the temperature of an emission control device 11 2002
7,032,572 Method for controlling an engine to obtain rapid catalyst heating 5 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 27 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 19 2002
6,735,938 Method to control transitions between modes of operation of an engine 44 2002
6,736,120 Method and system of adaptive learning for engine exhaust gas sensors 10 2002
6,736,121 Method for air-fuel ratio sensor diagnosis 48 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
7,332,135 Catalyst system for the reduction of NOx and NH.sub.3 emissions 25 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 6 2004
7,059,112 Degradation detection method for an engine having a NOx sensor 10 2004
7,047,932 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 2 2004
7,069,903 Idle speed control for lean burn engine with variable-displacement-like characteristic 8 2004
7,640,730 emissions 3 2007
7,485,273 emissions 4 2007
7,674,743 emissions 4 2008
 
FORD GLOBAL TECHNOLOGIES, INC. (25)
6,182,444 Emission control system 24 1999
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
6,389,803 Emission control for improved vehicle performance 7 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 31 2001
6,453,666 Method and system for reducing vehicle tailpipe emissions when operating lean 3 2001
8,240,132 emissions 0 2007
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (9)
5,782,087 Device for purifying exhaust gas of an engine 27 1996
5,964,088 Device for purifying exhaust gas of engine 40 1997
5,974,793 Exhaust gas purification device for an internal combustion engine 104 1997
6,047,542 Method and device for purifying exhaust gas of engine 55 1998
6,014,859 Device for purifying exhaust gas of engine 112 1998
6,345,496 Method and device for purifying exhaust gas of an engine 47 2000
6,978,600 Secondary air supply system and secondary air supply method 3 2003
8,307,639 Exhaust purification device of internal combustion engine 0 2008
8,297,044 Exhaust purification device of an internal combustion engine 0 2008
 
JOHNSON MATTHEY PUBLIC LIMITED COMPANY (5)
6,889,498 Emissions control 8 1999
6,477,831 Combatting air pollution 6 1999
6,877,313 Particulate control 18 2001
7,111,453 Emissions control 5 2005
7,430,857 Emissions control 1 2006
 
DELPHI TECHNOLOGIES, INC. (4)
6,758,036 Method for sulfur protection of NOx adsorber 17 2000
6,832,473 Method and system for regenerating NOx adsorbers and/or particulate filters 54 2002
7,093,428 Exhaust system and method of thermal management 21 2004
7,435,275 System and method of heating an exhaust treatment device 2 2005
 
SOUTHWEST RESEARCH INSTITUTE (3)
6,293,096 Multiple stage aftertreatment system 50 1999
6,615,580 Integrated system for controlling diesel engine emissions 32 2001
6,718,757 Integrated method for controlling diesel engine emissions in CRT-LNT system 24 2003
 
DAIMLER AG (2)
6,161,377 Internal-combustion engine system having a nitrogen oxide storage catalyst and an operating process therefor 24 1998
6,209,316 Method for running a diesel engine 13 1999
 
UMICORE AG & CO. KG (2)
7,767,163 Exhaust treatment devices 2 2004
7,905,087 Method for regenerating nitrogen oxide storage catalysts 0 2006
 
DENSO CORPORATION (1)
7,266,440 Air/fuel ratio control system for automotive vehicle using feedback control 1 2005
 
ENERGY AND ENVIRONMENTAL RESEARCH CORPORATION (1)
5,800,793 Process for reducing NO.sub.x from mobile source engine exhaust 7 1996
 
ENGELHARD CORPORATION (1)
6,125,629 Staged reductant injection for improved NO.sub.x reduction 97 1998
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (1)
6,223,525 Air-fuel ratio controlling device for an internal combustion engine 6 1999
 
MITSUBISHI JIDOSHA KOGYO K.K. (A.K.A. MITSUBISHI MOTORS CORPORATION) (1)
7,127,883 Exhaust gas purifying apparatus of internal combustion engine 4 1998
 
NISSAN MOTOR CO., LTD. (1)
6,170,260 Exhaust emission control apparatus for combustion engine 7 1998
 
SANDVIK INTELLECTUAL PROPERTY AB (1)
6,935,102 Method of controlling the concentration of nitrogen oxides, hydrocarbons and carbon monoxide in conjunction with the cleansing of emission gases 2 2001
 
VOLKSWAGEN AG (1)
6,523,342 Method and system for the catalytic aftertreatment of the exhaust gas of an internal-combustion engine 5 2001
 
YAMAHA HATSUDOKI KABUSHIKI KAISHA (1)
8,014,931 Secondary air supply system and vehicle 0 2008