US Patent No: 6,138,453

Number of patents in Portfolio can not be more than 2000

Exhaust gas purification device for an internal combustion engine

Stats

ATTORNEY / AGENT: (SPONSORED)
 

Importance

Loading Importance Indicators... loading....

Abstract

In an exhaust gas purification device for an internal combustion engine, a NO.sub.X occluding and reducing catalyst is disposed in the exhaust gas passage of an engine. The NO.sub.X occluding and reducing catalyst absorbs NO.sub.X in the exhaust gas when the air-fuel ratio of the exhaust gas is at a lean air-fuel ratio and releases and reduces NO.sub.X when the air-fuel ratio of the exhaust gas is at a rich air-fuel ratio. The air-fuel ratio of the exhaust gas flowing out from the catalyst is detected by an air-fuel ratio sensor disposed in the exhaust gas passage downstream of the catalyst. When the air-fuel ratio of the exhaust gas flowing into the catalyst is changed from a rich air-fuel ratio to a lean air-fuel ratio, the air-fuel ratio of the exhaust gas flowing out from the catalyst stays at a stoichiometric air-fuel ratio before it changes to a lean air-fuel ratio. The length of the period in which the air-fuel ratio of the exhaust gas flowing out from the catalyst stays at a stoichiometric air-fuel ratio corresponds to the magnitude of the ability of the NO.sub.X occluding and reducing catalyst as a reducing catalyst. Thus, by measuring the length of the stoichiometric air-fuel ratio period of the exhaust gas flowing out from the NO.sub.X occluding and reducing catalyst, the ability of the NO.sub.X occluding and reducing catalyst as a reducing catalyst can be precisely evaluated.

Loading the Abstract Image... loading....

First Claim

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
TOYOTA JIDOSHA KABUSHIKI KAISHAAICHI-KEN12954

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kako, Junichi Susono, JP 24 260
Sawada, Hiroshi Gotenba, JP 171 642

Cited Art

Patent Info (Count) # Cites Year
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (5)
5,448,887 Exhaust gas purification device for an engine 80 1994
5,732,553 Device for determining deterioration of a catalytic converter for an engine 13 1996
5,778,667 Method and a device for purifying combustion exhaust gas 31 1997
5,983,629 Device for determining deterioration of a catalyst for an engine 15 1997
5,970,707 Exhaust gas purification device for an internal combustion engine 93 1998
 
CANON KABUSHIKI KAISHA (1)
8,014,031 Formation of picture image having gradation expressed by fill area and one-line image data 2 2008
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (1)
5,325,664 System for determining deterioration of catalysts of internal combustion engines 100 1992

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, LLC (14)
6,691,507 Closed-loop temperature control for an emission control device 10 2000
6,588,200 Method for correcting an exhaust gas oxygen sensor 0 2001
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
6,763,656 Method and apparatus for optimizing purge fuel for purging emissions control device 1 2002
7,003,944 Computing device to generate even heating in exhaust system 4 2003
6,854,264 Computer controlled engine adjustment based on an exhaust flow 2 2003
6,766,641 Temperature control via computing device 37 2003
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
6,418,711 Method and apparatus for estimating lean NOx trap capacity 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
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (8)
6,263,667 Exhaust gas purification device for an internal combustion engine 7 2000
6,519,934 Emission control method and apparatus of an internal combustion engine 3 2001
6,915,628 Catalyst degradation determining method 12 2003
8,234,853 Catalyst degradation determining method 0 2005
7,165,389 Catalyst degradation determining method 4 2005
7,117,665 Catalyst degradation determining method 3 2005
8,099,948 Exhaust system of internal combustion engine 0 2006
8,087,232 Exhaust system of internal combustion engine 0 2006
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (2)
6,484,493 Exhaust emission control device for internal combustion engine 11 2000
6,338,243 Exhaust emission control system for internal combustion engine 9 2000
 
INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC (2)
7,669,408 LNT desulfation strategy with reformer temperature management 3 2005
7,412,823 LNT desulfation strategy 2 2006
 
NISSAN MOTOR CO., LTD. (2)
6,516,612 Exhaust gas purification device for an engine and A/F ratio control for early activating a NOx trapping catalyst 25 2000
6,233,923 Exhaust emission control device of internal combustion engine 25 2000
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (1)
8,146,345 Normalizing oxygen storage capacity(OSC) for catalyst monitoring 0 2007
 
HONDA GIKEN KOGYO, ET AL. (1)
6,698,187 Exhaust gas purifying apparatus for an internal-combustion engine 8 2002
 
MAZDA MOTOR CORPORATION (1)
6,725,650 Exhaust gas purifying system for engine 4 2001
 
MITSUBISHI JIDOSHA KOGYO K.K. (A.K.A. MITSUBISHI MOTORS CORPORATION) (1)
6,711,892 Exhaust gas purifier for internal combustion engines 11 2002
 
PEUGEOT CITROEN AUTOMOBILES SA (1)
7,251,930 System for triggering the purging of NOx trap depollution means 3 2005
 
ROBERT BOSCH GMBH (1)
6,550,236 Method for operating a three-way catalyst of an internal combustion engine 0 2001
 
UMICORE AG & CO. KG (1)
8,230,674 Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter 0 2005
 
VOLKSWAGEN AG (1)
6,823,657 Regeneration of a NOx storage catalytic converter of an internal combustion engine 5 2000