System for detecting deterioration of catalyst for purifying exhaust gas

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6073440
SERIAL NO

08828181

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Abstract

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In a system for detecting deterioration of an exhaust catalyst, when a catalyst temperature exceeds 150.degree. C., the changing widths of the output voltage of an oxygen sensor downstream of the catalyst are integrated for a predetermined sampling period to determine data .SIGMA.V reflecting the amount of purified gas component, and the deviation of the air/fuel ratio detected by an air/fuel ratio sensor upstream of the catalyst, and a target A/F and an exhaust gas flow rate or an intake flow rate are multiplied so that data .SIGMA.A/F .cndot.Q of the fluctuation of the gas component flowing into the catalyst are determined by integrating the multiplied values. At the instant when the catalyst temperature reaches 550.degree. C., the data .SIGMA.V, as integrated till then, are compared with a deterioration determining value, as set according to the data .SIGMA.A/F.cndot.Q, to determine whether the catalyst is deteriorated.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DENSO CORPORATIONKARIYA-CITY AICHI-PREF10470

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Douta, Hisayo Chiryu, JP 7 88
Mukai, Yasuo Kariya, JP 45 321
Nakayama, Masaaki Toyoake, JP 98 1139

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MAZDA MOTOR CORPORATION (2)
* 5832724 Air-fuel ratio control system for engines 11 1996
* 5851376 Catalyst degradation determination apparatus and method 19 1996
 
GENERAL MOTORS CORPORATION (1)
* 5787705 Catalyst diagnostic 18 1996
 
Nippondenso Co., Ltd. (2)
* 5154055 Apparatus for detecting purification factor of catalyst 37 1991
* 5727383 Catalyst deterioration detecting apparatus and exhaust emission control device failure detecting apparatus 16 1996
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (3)
* 5279116 Device for determining deterioration of a catalytic converter for an engine 22 1992
* 5301501 Device for determining deterioration of a catalytic converter for an engine 29 1992
* 5303548 Device for determining deterioration of a catalytic converter for an engine 18 1992
 
ECO FENCE INC. (1)
* 5675967 Method and arrangement for evaluating the operability of a catalytic converter 35 1993
 
UNISIA JECS CORPORATION (1)
* 5606855 Apparatus and method for estimating the temperature of an automotive catalytic converter 37 1995
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
DAIMLER AG (2)
* 6964194 Device and method for determining the state of ageing of an exhaust-gas catalytic converter 4 2005
* 2005/0145,024 Device and method for determining the state of ageing of an exhaust-gas catalytic converter 0 2005
 
NISSAN MOTOR CO., LTD. (1)
* 6220017 Exhaust emission control system for internal combustion engine 6 1999
 
CUMMINS INC. (1)
8215098 Method and apparatus for diagnosing exhaust gas aftertreatment component degradation 4 2005
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (4)
* 7536851 Catalyst condition monitor based on differential area under the oxygen sensors curve algorithm 5 2005
* 2006/0201,138 Catalyst condition monitor based on differential area under the oxygen sensors curve algorithm 1 2005
* 9239017 Stop-start control systems for engines with fully flexible valve actuation system 0 2011
* 2013/0110,383 STOP-START CONTROL SYSTEMS FOR ENGINES WITH FULLY FLEXIBLE VALVE ACTUATION SYSTEM 5 2011
 
GM GLOBAL TECHNOLOGY OPERATIONS, INC. (1)
* 6668545 Catalyst warm-up assessment method for a motor vehicle catalytic converter 2 2001
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (4)
* 6427438 Method of evaluating deteriorated state of catalytic converter for purifying exhaust gas 2 2000
* 6397585 Catalyst temperature estimating apparatus 6 2000
* 6449943 Method of evaluating deteriorated state of catalytic converter for purifying exhaust gas 10 2000
* 6449944 Method of judging deterioration of emission gas control catalyst device 12 2001
 
DENSO CORPORATION (6)
* 6295807 System for detecting deterioration of catalyst for purifying exhaust gas 6 2000
6600998 Catalyst deteriorating state detecting apparatus 6 2000
* 6898927 Emission control system with catalyst warm-up speeding control 44 2002
* 2003/0070,423 Emission control system with catalyst warm-up speeding control 14 2002
* 8407983 Abnormality diagnosis device of internal combustion engine 1 2008
* 2009/0139,213 ABNORMALITY DIAGNOSIS DEVICE OF INTERNAL COMBUSTION ENGINE 4 2008
 
ROBERT BOSCH GMBH (1)
* 6550236 Method for operating a three-way catalyst of an internal combustion engine 1 2001
 
MITSUBISHI DENKI KABUSHIKI KAISHA (2)
* 7168240 Control apparatus for an internal combustion engine 2 2005
* 2006/0090,456 Control apparatus for an internal combustion engine 0 2005
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (5)
* 6389807 Control apparatus and control method for motor vehicle 27 2000
* 6755013 Apparatus and method for detecting deterioration of catalyst of internal combustion engine 5 2002
* 2003/0070,420 Apparatus and method for detecting deterioration of catalyst of internal combustion engine 1 2002
* 8522531 Catalyst degradation detection apparatus and catalyst degradation detection method 2 2011
* 2012/0031,170 CATALYST DEGRADATION DETECTION APPARATUS AND CATALYST DEGRADATION DETECTION METHOD 4 2011
 
FORD GLOBAL TECHNOLOGIES, LLC (9)
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 15 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 7 2001
6553754 Method and system for controlling an emission control device based on depletion of device storage capacity 19 2001
7059112 Degradation detection method for an engine having a NOx sensor 15 2004
 
FORD GLOBAL TECHNOLOGIES, INC. (13)
* 6523341 Cold start vehicle catalyst monitor 6 2000
* 6360529 Method and apparatus for enabling lean engine operation upon engine start-up 4 2000
6360530 Method and apparatus for measuring lean-burn engine emissions 7 2000
6397583 Method for catalyst monitoring using flex fuel 10 2001
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 38 2001
6453666 Method and system for reducing vehicle tailpipe emissions when operating lean 3 2001
* 2004/0187,482 Degradation detection method for an engine having a NOx sensor 4 2004
 
CATERPILLAR INC. (2)
6557528 Method of controlling detonation in an internal combustion engine 3 2001
6425372 Method of controlling generation of nitrogen oxides in an internal combustion engine 3 2001
* Cited By Examiner