US Patent No: 6,073,440

Number of patents in Portfolio can not be more than 2000

System for detecting deterioration of catalyst for purifying exhaust gas

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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-PREF10649

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Douta, Hisayo Chiryu, JP 7 86
Mukai, Yasuo Moriguchi, JP 52 252
Nakayama, Masaaki Osaka, JP 119 896

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (3)
5,279,116 Device for determining deterioration of a catalytic converter for an engine 20 1992
5,301,501 Device for determining deterioration of a catalytic converter for an engine 27 1992
5,303,548 Device for determining deterioration of a catalytic converter for an engine 18 1992
 
MAZDA MOTOR CORPORATION (2)
5,832,724 Air-fuel ratio control system for engines 11 1996
5,851,376 Catalyst degradation determination apparatus and method 18 1996
 
Nippondenso Co., Ltd. (2)
5,154,055 Apparatus for detecting purification factor of catalyst 37 1991
5,727,383 Catalyst deterioration detecting apparatus and exhaust emission control device failure detecting apparatus 14 1996
 
ECO FENCE INC. (1)
5,675,967 Method and arrangement for evaluating the operability of a catalytic converter 34 1993
 
GENERAL MOTORS CORPORATION (1)
5,787,705 Catalyst diagnostic 16 1996
 
UNISIA JECS CORPORATION (1)
5,606,855 Apparatus and method for estimating the temperature of an automotive catalytic converter 36 1995

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
FORD GLOBAL TECHNOLOGIES, INC. (12)
6,523,341 Cold start vehicle catalyst monitor 5 2000
6,360,529 Method and apparatus for enabling lean engine operation upon engine start-up 4 2000
6,360,530 Method and apparatus for measuring lean-burn engine emissions 7 2000
6,397,583 Method for catalyst monitoring using flex fuel 8 2001
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
 
FORD GLOBAL TECHNOLOGIES, LLC (9)
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
7,059,112 Degradation detection method for an engine having a NOx sensor 12 2004
 
DENSO CORPORATION (4)
6,295,807 System for detecting deterioration of catalyst for purifying exhaust gas 6 2000
6,600,998 Catalyst deteriorating state detecting apparatus 5 2000
6,898,927 Emission control system with catalyst warm-up speeding control 39 2002
8,407,983 Abnormality diagnosis device of internal combustion engine 0 2008
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (4)
6,427,438 Method of evaluating deteriorated state of catalytic converter for purifying exhaust gas 2 2000
6,397,585 Catalyst temperature estimating apparatus 4 2000
6,449,943 Method of evaluating deteriorated state of catalytic converter for purifying exhaust gas 7 2000
6,449,944 Method of judging deterioration of emission gas control catalyst device 11 2001
 
TOYOTA JIDOSHA KABUSHIKI KAISHA (3)
6,389,807 Control apparatus and control method for motor vehicle 23 2000
6,755,013 Apparatus and method for detecting deterioration of catalyst of internal combustion engine 5 2002
8,522,531 Catalyst degradation detection apparatus and catalyst degradation detection method 0 2011
 
CATERPILLAR INC. (2)
6,557,528 Method of controlling detonation in an internal combustion engine 3 2001
6,425,372 Method of controlling generation of nitrogen oxides in an internal combustion engine 3 2001
 
CUMMINS, INC. (1)
8,215,098 Method and apparatus for diagnosing exhaust gas aftertreatment component degradation 0 2005
 
DAIMLER AG (1)
6,964,194 Device and method for determining the state of ageing of an exhaust-gas catalytic converter 3 2005
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (1)
7,536,851 Catalyst condition monitor based on differential area under the oxygen sensors curve algorithm 3 2005
 
GM GLOBAL TECHNOLOGY OPERATIONS, INC. (1)
6,668,545 Catalyst warm-up assessment method for a motor vehicle catalytic converter 1 2001
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
7,168,240 Control apparatus for an internal combustion engine 2 2005
 
NISSAN MOTOR CO., LTD. (1)
6,220,017 Exhaust emission control system for internal combustion engine 6 1999
 
ROBERT BOSCH GMBH (1)
6,550,236 Method for operating a three-way catalyst of an internal combustion engine 0 2001