US Patent No: 5,165,230

Number of patents in Portfolio can not be more than 2000

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

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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-KEN15342

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kayanuma, Nobuaki Gotenba, JP 27 694
Sawano, Masayuki Tokyo, JP 2 84

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Nippondenso Co., Ltd. (2)
4,251,989 Air-fuel ratio control system 95 1979
5,097,700 Apparatus for judging catalyst of catalytic converter in internal combustion engine 76 1991
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (2)
4,739,614 Double air-fuel ratio sensor system in internal combustion engine 41 1986
5,088,281 Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system 79 1989
 
DAIMLER-BENZ AKTIENGESELLSCHAFT (1)
4,622,809 Method and apparatus for monitoring and adjusting .lambda.-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines 114 1985
 
FORD GLOBAL TECHNOLOGIES, INC. (1)
5,077,970 Method of on-board detection of automotive catalyst degradation 54 1990

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, LLC (33)
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 10 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
7,168,239 Method and system for rapid heating of an emission control device 11 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 21 2002
6,769,398 Idle speed control for lean burn engine with variable-displacement-like characteristic 35 2002
6,758,185 Method to improve fuel economy in lean burn engines with variable-displacement-like characteristics 26 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 51 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 51 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 85 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 4 2004
7,069,903 Idle speed control for lean burn engine with variable-displacement-like characteristic 10 2004
 
FORD GLOBAL TECHNOLOGIES, INC. (25)
5,289,678 Apparatus and method of on-board catalytic converter efficiency monitoring 29 1992
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 10 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 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
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (4)
5,359,853 Device for detecting deterioration of a catalytic converter for an engine 19 1993
5,732,553 Device for determining deterioration of a catalytic converter for an engine 13 1996
5,737,916 Catalyst deterioration detection device for internal combustion engine 15 1996
8,074,441 Apparatus and method for determining catalyst degradation 0 2006
 
CHRYSLER GROUP LLC (1)
5,847,271 Catalytic converter efficiency monitor 24 1996
 
HONDA MOTOR CO., LTD. (1)
5,406,789 Air-fuel ratio control system for internal combustion engines 4 1993
 
HYUNDAI MOTOR COMPANY (1)
5,929,320 Apparatus and method for judging deterioration of catalysts device and oxygen content sensing device 25 1996
 
Nippondenso Co., Ltd. (1)
5,390,491 Ignition timing control system for internal combustion engine 12 1994
 
ROBERT BOSCH GMBH (1)
5,335,538 Method and arrangement for determining the storage capacity of a catalytic converter 93 1992