Apparatus for determining deterioration of three-way catalyst of internal combustion engine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO

5165230

SERIAL NO

07793103

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Abstract

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An apparatus for determining a deterioration of a condition of a three-way catalyst arranged in an exhaust passage of an internal combustion engine, comprising an upstream O.sub.2 sensor arranged in the exhaust passage upstream of the catalyst and a downstream O.sub.2 sensor arranged in the exhaust passage downstream of the catalyst. An air-fuel ratio feedback correction amount is calculated in accordance with the output of the upstream O.sub.2 sensor, and the rate of change of the air-fuel ratio feedback correction amount is decreased when it is determined that the condition of the catalyst has deteriorated.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TOYOTA JIDOSHA KABUSHIKI KAISHAAICHI-KEN14259

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kayanuma, Nobuaki Gotenba, JP 27 720
Sawano, Masayuki Sunto, JP 2 85

Cited Art Landscape

Patent Info (Count) # Cites Year
 
DAIMLER-BENZ AKTIENGESELLSCHAFT (1)
* 4622809 Method and apparatus for monitoring and adjusting .lambda.-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines 114 1985
 
Nippondenso Co., Ltd. (1)
* 5097700 Apparatus for judging catalyst of catalytic converter in internal combustion engine 77 1991
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (2)
* 4739614 Double air-fuel ratio sensor system in internal combustion engine 43 1986
* 5088281 Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system 81 1989
 
FORD GLOBAL TECHNOLOGIES, INC. (1)
* 5077970 Method of on-board detection of automotive catalyst degradation 57 1990
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ROBERT BOSCH GMBH (1)
* 5335538 Method and arrangement for determining the storage capacity of a catalytic converter 93 1992
 
FCA US LLC (1)
* 5847271 Catalytic converter efficiency monitor 32 1996
 
HONDA MOTOR CO., LTD. (1)
* 5406789 Air-fuel ratio control system for internal combustion engines 4 1993
 
Nippondenso Co., Ltd. (1)
* 5390491 Ignition timing control system for internal combustion engine 13 1994
 
HYUNDAI MOTOR COMPANY (1)
* 5929320 Apparatus and method for judging deterioration of catalysts device and oxygen content sensing device 25 1996
 
FORD GLOBAL TECHNOLOGIES, LLC (35)
6843051 Method and apparatus for controlling lean-burn engine to purge trap of stored NOx 1 2000
6810659 Method for determining emission control system operability 3 2000
6708483 Method and apparatus for controlling lean-burn engine based upon predicted performance impact 3 2000
6629453 Method and apparatus for measuring the performance of an emissions control device 8 2000
6594989 Method and apparatus for enhancing fuel economy of a lean burn internal combustion engine 32 2000
6691507 Closed-loop temperature control for an emission control device 18 2000
6860100 Degradation detection method for an engine having a NOx sensor 6 2001
6694244 Method for quantifying oxygen stored in a vehicle emission control device 11 2001
6691020 Method and system for optimizing purge of exhaust gas constituent stored in an emission control device 2 2001
6650991 Closed-loop method and system for purging a vehicle emission control 2 2001
6615577 Method and system for controlling a regeneration cycle of an emission control device 20 2001
6604504 Method and system for transitioning between lean and stoichiometric operation of a lean-burn engine 6 2001
6553754 Method and system for controlling an emission control device based on depletion of device storage capacity 17 2001
6990799 Method of determining emission control system operability 7 2001
* 2002/0007,628 Method for determining emission control system operability 0 2001
7168239 Method and system for rapid heating of an emission control device 12 2002
7111450 Method for controlling the temperature of an emission control device 14 2002
7032572 Method for controlling an engine to obtain rapid catalyst heating 10 2002
6925982 Overall scheduling of a lean burn engine system 1 2002
6868827 Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device 21 2002
6769398 Idle speed control for lean burn engine with variable-displacement-like characteristic 41 2002
6758185 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 26 2002
6745747 Method for air-fuel ratio control of a lean burn engine 24 2002
6735938 Method to control transitions between modes of operation of an engine 60 2002
6736120 Method and system of adaptive learning for engine exhaust gas sensors 15 2002
6736121 Method for air-fuel ratio sensor diagnosis 51 2002
6725830 Method for split ignition timing for idle speed control of an engine 10 2002
6715462 Method to control fuel vapor purging 22 2002
6568177 Method for rapid catalyst heating 87 2002
6874490 Method and system of adaptive learning for engine exhaust gas sensors 16 2004
6955155 Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device 8 2004
* 2004/0182,365 Method for controlling transitions between operating modes of an engine for rapid heating of an emission control device 0 2004
7059112 Degradation detection method for an engine having a NOx sensor 13 2004
7047932 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 4 2004
7069903 Idle speed control for lean burn engine with variable-displacement-like characteristic 11 2004
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (4)
* 5359853 Device for detecting deterioration of a catalytic converter for an engine 21 1993
* 5732553 Device for determining deterioration of a catalytic converter for an engine 16 1996
* 5737916 Catalyst deterioration detection device for internal combustion engine 15 1996
* 8074441 Apparatus and method for determining catalyst degradation 1 2006
 
FORD GLOBAL TECHNOLOGIES, INC. (25)
* 5289678 Apparatus and method of on-board catalytic converter efficiency monitoring 31 1992
6539704 Method for improved vehicle performance 4 2000
6499293 Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine 9 2000
6487849 Method and apparatus for controlling lean-burn engine based upon predicted performance impact and trap efficiency 15 2000
6487850 Method for improved engine control 11 2000
6481199 Control for improved vehicle performance 10 2000
6477832 Method for improved performance of a vehicle having an internal combustion engine 13 2000
6438944 Method and apparatus for optimizing purge fuel for purging emissions control device 10 2000
6434930 Method and apparatus for controlling lean operation of an internal combustion engine 3 2000
6427437 Method for improved performance of an engine emission control system 7 2000
6374597 Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent 13 2000
6360530 Method and apparatus for measuring lean-burn engine emissions 7 2000
6327847 Method for improved performance of a vehicle 13 2000
6308515 Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent 15 2000
6308697 Method for improved air-fuel ratio control in engines 12 2000
6389803 Emission control for improved vehicle performance 12 2000
6546718 Method and system for reducing vehicle emissions using a sensor downstream of an emission control device 5 2001
6539706 Method and system for preconditioning an emission control device for operation about stoichiometry 1 2001
6502387 Method and system for controlling storage and release of exhaust gas constituents in an emission control device 11 2001
6490860 Open-loop method and system for controlling the storage and release cycles of an emission control device 7 2001
6487853 Method and system for reducing lean-burn vehicle emissions using a downstream reductant sensor 7 2001
6467259 Method and system for operating dual-exhaust engine 44 2001
6463733 Method and system for optimizing open-loop fill and purge times for an emission control device 36 2001
6453666 Method and system for reducing vehicle tailpipe emissions when operating lean 3 2001
6490856 Control for improved vehicle performance 9 2002
* Cited By Examiner