Method and system for estimating a midbed temperature of a catalytic converter

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5956941
SERIAL NO

08731421

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method and system for estimating the midbed temperature of a catalytic converter in an exhaust system of an internal combustion engine. A rate of change in the speed of the engine is sensed and an estimated number of misfires occurring in the engine over a predetermined number of cylinder filling events is determined based on the sensed rate of change in engine speed. An instantaneous temperature of exhaust gas at the exhaust flange is determined based on the estimated rate of misfires. An instantaneous temperature at the midbed point of the catalytic converter is then determined based on the instantaneous temperature of exhaust gas at the exhaust flange. The instantaneous temperature at the midbed point is compared to a predetermined temperature threshold and the estimate rate of misfires is compared to a predetermined misfire rate threshold. A malfunction signal is then generated if both the instantaneous temperature at the midbed point exceeds the predetermined temperature threshold and the estimated rate of misfires exceeds the predetermined misfire rate threshold. A method for monitoring catalyst degradation is also disclosed.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FORD GLOBAL TECHNOLOGIES, INC.DEARBORN, MI1736

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Baskins, Robert Sarow Chelsea, MI 27 284
Cullen, Michael John Northville, MI 94 1415
Davey, Christopher K Novi, MI 8 240
Nader, David R Farmington Hills, MI 3 56
Zaghati, Ziad Dearborn Heights, MI 2 30

Cited Art Landscape

Patent Info (Count) # Cites Year
 
HONDA GIKEN KOGYO KABUSHIKI KAISHA (2)
* 5509268 Combustion state-determining system and combustion state control system for internal combustion engines 6 1994
* 5513520 Combustion state-determining system for internal combustion engines 2 1994
 
Fluidyne Engineering Corporation (1)
4433631 Method and apparatus for producing a useful stream of hot gas from a fluidized bed combustor while controlling the bed's temperature 3 1981
 
NISSAN MOTOR CO., LTD. (1)
* 5729971 Engine catalyst temperature estimating device and catalyst diagnostic device 36 1996
 
FORD GLOBAL TECHNOLOGIES, INC. (3)
* 5303168 Engine operation to estimate and control exhaust catalytic converter temperature 58 1991
* 5414994 Method and apparatus to limit a midbed temperature of a catalytic converter 126 1994
* 5722236 Adaptive exhaust temperature estimation and control 101 1996
 
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
 
MITSUBISHI JIDOSHA KOGYO K.K. (A.K.A. MITSUBISHI MOTORS CORPORATION) (3)
* 6729301 Ignition timing control system for internal combustion engine 34 2003
* 2003/0226,544 Ignition timing control system for internal combustion engine 4 2003
* 6957527 Device and method for estimating catalytic temperature 6 2004
 
DENSO CORPORATION (1)
* 7316157 Device and method for estimating temperature of exhaust pipe of internal combustion engine 9 2006
 
ROBERT BOSCH GMBH (1)
* 2005/0228,572 Catalyst temperature modelling during exotermic operation 11 2004
 
CONTINENTAL AUTOMOTIVE GMBH (3)
* 6314723 Method of checking the functional capability of a catalytic converter 9 2000
* 7831376 Method and device for operating an internal combustion engine 0 2006
* 2008/0295,487 Method and Device for Operating an Internal Combustion Engine 0 2006
 
FCA US LLC (3)
* 6295806 Catalyst temperature model 6 2000
* 9429090 Method of estimating catalyst temperature of a multi-displacement internal combustion engine 0 2008
* 2009/0301,060 METHOD OF ESTIMATING CATALYST TEMPERATURE OF A MULTI-DISPLACEMENT INTERNAL COMBUSTION ENGINE 7 2008
 
PEUGEOT CITROEN AUTOMOBILES SA (1)
* 7299689 Process and device for determining the internal temperature of a catalytic converter of a vehicle equipped with a heat engine 2 2004
 
NISSAN MOTOR CO., LTD. (1)
* 6494037 Engine exhaust purification device 5 2001
 
RENAULT S.A.S. (1)
* 7673503 Method for estimating an engine exhaust temperature and method for diagnosing a cylinder pressure sensor using an exhaust temperature estimate 2 2006
 
FORD GLOBAL TECHNOLOGIES, LLC (7)
* 6691507 Closed-loop temperature control for an emission control device 18 2000
* 6993899 System and method for controlling catalyst storage capacity 5 2001
6601382 Method and apparatus for determining a temperature of an emission catalyst 5 2001
6739123 Temperature management of catalyst system for a variable displacement engine 19 2002
6681563 Exhaust gas oxygen sensor temperature control for a variable displacement engine 5 2002
7143574 System and method for determining set point location for oxidant-based engine air/fuel control strategy 2 2004
6938410 Temperature management of catalyst system for a variable displacement engine 4 2004
 
FORD GLOBAL TECHNOLOGIES, INC. (5)
6415601 Temperature management of catalyst system for a variable displacement engine 67 2000
6389806 Variable displacement engine control for fast catalyst light-off 76 2000
6381953 Exhaust gas oxygen sensor temperature control for a variable displacement engine 7 2000
* 2004/0128,984 System and method for determining set point location for oxidant-based engine air/fuel control strategy 0 2004
* 2004/0206,071 Temperature management of catalyst system for a variable displacement engine 6 2004
 
GM GLOBAL TECHNOLOGY OPERATIONS LLC (6)
* 7051517 Apparatus and method for electronic throttle control power management enhancements 4 2003
* 2005/0016,162 Apparatus and method for electronic throttle control power management enhancements 2 2003
* 8646252 Preventing catalyst damage during misfire event 3 2010
* 2011/0167,797 PREVENTING CATALYST DAMAGE DURING MISFIRE EVENT 3 2010
9494090 System and method for controlling an engine in a bi-fuel vehicle to prevent damage to a catalyst due to engine misfire 0 2013
9457789 System and method for controlling a multi-fuel engine to reduce engine pumping losses 0 2014
* Cited By Examiner