Exhaust Gas Recirculation System (egr) Patents (Class 73/114.74)
  • Patent number: 11022061
    Abstract: Methods and systems are provided for identifying degraded exhaust gas temperature (EGT) sensor responses. In one example, a method may include cycling an engine between a higher temperature operating mode and a lower temperature operating mode while maintaining engine torque output across the higher temperature operating mode and the lower temperature operating modes, both the higher temperature operating mode and the lower temperature operating mode providing stoichiometric exhaust gas to a downstream catalyst, and characterizing a response behavior of an EGT sensor based on output of the EGT sensor during the cycling. In this way, stepwise exhaust gas temperature changes are produced for characterizing the EGT sensor response without disrupting emissions and torque control.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: June 1, 2021
    Assignee: Ford Global Technologies, LLC
    Inventors: Michael Scott Christensen, Michael Bastanipour, Douglas Raymond Martin, Adam Joseph Krach
  • Patent number: 10927778
    Abstract: An engine system includes an injector, an EGR device (including an EGR valve having a step motor) to recirculate part of exhaust gas of an engine as EGR gas to the engine, and an electronic control unit (ECU) to control the injector, the EGR valve, and others based on an operating state of the engine. The ECU is configured to diagnose foreign-matter lodging abnormality of the EGR valve and a lodged foreign-matter diameter based on detected intake pressure during engine deceleration. When existence of the abnormality and the foreign-matter diameter are determined, the ECU controls the step motor to hold the EGR valve at a first opening degree smaller than a second opening degree needed to remove a foreign matter before fuel cut to the engine by the injector.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: February 23, 2021
    Assignee: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Masateru Nagao, Mamoru Yoshioka, Masanao Kurita
  • Patent number: 10731580
    Abstract: Methods and systems are provided for determining a dilution of recirculated gases, including blowthrough air, combusted exhaust gas, and fuel vapor, in a split exhaust engine. In one example, the dilution rate may be calculated using a feedforward model that includes determining a pressure differential across a region in an intake passage, mapped engine parameters such as gas temperature, and exhaust valve timing. Engine operations such as spark advance and fuel injection may be adjusted according to the modeled rate to reduce engine knock and improve combustion efficiency.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: August 4, 2020
    Assignee: Ford Global Technologies, LLC
    Inventors: Gopichandra Surnilla, Timothy Clark, Joseph Ulrey, Mohannad Hakeem
  • Patent number: 10578059
    Abstract: Diagnostic systems and methods for detecting leaks in an exhaust gas recirculation (EGR) system of an engine of a vehicle utilize an upstream oxygen (O2) sensor disposed in an exhaust system of the engine upstream from an EGR port of the EGR system and configured to measure an upstream O2 concentration of exhaust gas produced by the engine, a downstream O2 sensor disposed in the exhaust system downstream from the EGR port and configured to measure a downstream O2 concentration of the exhaust gas, and a controller configured to receive the measured upstream and downstream O2 concentrations from the upstream and downstream O2 sensors, respectively, and detect a leak in the EGR system when a difference between the measured downstream and upstream O2 concentrations exceeds a diagnostic threshold.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: March 3, 2020
    Assignee: FCA US LLC
    Inventors: Tamer Badawy, Kaustabh Pethe, Lurun Zhong
  • Patent number: 10227955
    Abstract: An exhaust gas recirculation system includes an intake manifold, an exhaust manifold, an EGR cooler, an EGR exhaust conduit and an EGR intake conduit having a diffuser. The intake manifold and the exhaust manifold are affixed to an engine head. The intake and exhaust manifolds are each in fluid communication with a plurality of combustion chambers defined by the engine head and an engine block. The EGR cooler includes a EGR cooler inlet and a EGR cooler outlet wherein the EGR exhaust conduit fluidly couples the exhaust manifold to the EGR cooler inlet. The EGR intake conduit includes a first end and a second end wherein the first end is affixed to the EGR cooler outlet and the second end is affixed to an intake passageway for the intake manifold. The diffuser includes a plurality of fins affixed to the second end and extending into the intake passageway.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: March 12, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Srinivasa V. Duddu, Rahul S. Raj, Ravikumar S
  • Patent number: 9970348
    Abstract: Methods and systems are provided for adjusting an exhaust gas recirculation (EGR) valve based on a final EGR estimate. In one example, a method may include adjusting the EGR valve based on a final EGR flow estimate, the final EGR flow estimate based on a first EGR flow estimated with a differential pressure sensor across the EGR valve, a second EGR flow estimated with an intake oxygen sensor, and accuracy values of each of the first and second EGR flows. The accuracy value may be based on engine operating conditions during estimation of the first and second EGR flows.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: May 15, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: David G. Hagner, Gopichandra Surnilla, James Alfred Hilditch
  • Patent number: 9441553
    Abstract: A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: September 13, 2016
    Assignee: Ford Global Technologies, LLC
    Inventors: Ross Dykstra Pursifull, Joseph Norman Ulrey
  • Patent number: 9261052
    Abstract: In the engine including an MPL-EGR system having an HPL-EGR mechanism 6 and an LPL-EGR mechanism 7, a pressure difference between upstream side pressure and downstream side pressure of a low pressure EGR cooler 73 provided in the LPL-EGR mechanism 7 is detected by a pressure difference sensor 89. When an actual pressure difference value detected is higher than a reference pressure difference value in a state where no blocking occurs in the LPL-EGR mechanism 7, and the deviation amount therebetween reaches a predetermined amount, it is determined that the blocking occurs in the inside of the low pressure EGR cooler 73. In contrast, when the actual pressure difference value detected is lower than the reference pressure difference value, and the deviation amount therebetween reaches a predetermined amount, it is determined that the blocking occurs in the inside of the pipe members 74 and 75 except the low pressure EGR cooler 73.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: February 16, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hirotaka Saitoh, Yoshitaka Nakamura, Toru Kidokoro
  • Patent number: 9206768
    Abstract: An absolute value of a deviation of an actual EGR ratio, calculated in a current operational status of an engine 1, from a target EGR ratio set on the basis of current operational status of the engine 1 is acquired and is multiplied by a quotient, as gain, acquired from division of a feedback correction amount of opening degree of an EGR valve 12 by an upper limit of the feedback correction amount to determine normality when an acquired product is close to “0” and determine higher degree of abnormality the further the product is away from “0”.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: December 8, 2015
    Assignee: HINO MOTORS, LTD.
    Inventors: Hironori Narita, Munechika Tsutsumi, Hitoshi Nakano
  • Patent number: 9109518
    Abstract: An internal combustion engine is equipped with an EGR system that includes an EGR heat exchanger. A method for monitoring the EGR heat exchanger includes monitoring an EGR gas inlet temperature to the EGR heat exchanger, an EGR gas outlet temperature from the EGR heat exchanger, a coolant temperature and a mass EGR flowrate through the EGR heat exchanger for a present engine operating point. An actual thermal effectiveness of the EGR heat exchanger for the present engine operating point is determined. A maximum heat transfer coefficient for the EGR side of the EGR heat exchanger is determined for the present engine operating point. The EGR heat exchanger is regenerated when the actual heat transfer coefficient differs from the maximum heat transfer coefficient for the present engine operating point.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: August 18, 2015
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Sandro R. Balestrino, Alok Warey, Patrick G. Szymkowicz, Xiaobin Li
  • Patent number: 9109522
    Abstract: The invention relates to a method of controlling a combustion engine (1) comprising at least one cylinder (2) and a manifold (3) and an exhaust gas recirculation (EGR) circuit including an EGR valve. The EGR valve (6) is controlled by carrying out the following stages: a) measuring a pressure difference ?P in a portion of the exhaust gas recirculation circuit including the EGR valve; b) selecting a burnt gas fraction set point BGRsp in the intake manifold (3); c) calculating an opening set point for the EGR valve (6) from a pressure drop relation applied in a portion of the exhaust gas recirculation circuit including the EGR valve, depending on difference ?P at the EGR valve and on the burnt gas fraction set point BGRsp in the intake manifold; and d) controlling the EGR valve (6) as a function of the opening set point of EGR valve (6).
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: August 18, 2015
    Assignee: IFP ENERGIES nouvelles
    Inventors: Delphine Bresch-Pietri, Thomas LeRoy, Jonathan Chauvin
  • Patent number: 9103295
    Abstract: A current-control profile may be built from a sequence of phases in which the current is controlled in a defined manner. The electrical behavior of these phases may be configured within a list, which contains one entry, or slot, for each phase and which may be stored in a memory device. The order for stepping through the list is not hard-wired into the control circuit. Instead, such an order is part of the configuration for each entry, or slot, itself. Each entry/slot contains the information about the next phase, or the next possible phases depending upon the occurrence of any trigger events. In this way, the list of entries/slots is linked dynamically by the configuration thereby allowing for generation, in a flexible way, of current profiles with different characteristics and different numbers of phases and sequences.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: August 11, 2015
    Assignee: Continental Automotive Systems, Inc.
    Inventors: Bernard J. Bojarski, Dirk Etzler
  • Publication number: 20150047425
    Abstract: A method for specifying a malfunction of an exhaust gas recirculation system of an internal combustion engine of a motor vehicle, including: setting a first operating point of the engine and a first operating state of the fresh air/exhaust gas system as vehicle conditioning in a first measurement setting; measuring volumetric efficiencies of the engine for the first measurement setting and for at least one additional measurement setting, and comparing the measured volumetric efficiencies with an engine characteristics map stored in a memory unit for volumetric efficiency values of the engine, and ascertaining whether a malfunction is present during the exhaust gas recirculation process based on the comparison; and specifying the malfunction of the exhaust gas recirculation system while taking into account the measuring results for the first measurement setting and for the at least one additional measurement setting and the stored engine characteristics map for volumetric efficiency values.
    Type: Application
    Filed: December 27, 2012
    Publication date: February 19, 2015
    Inventors: Andreas Walter, Heiko Lenhardt, Michael Hackner, Johannes Zeidler
  • Patent number: 8950237
    Abstract: A gas analyzer system to determine the concentration of gases in an automotive air conditioning system comprising: an infrared multi-detector device equipped with a gas analysis chamber; an emitter source emitting infrared radiation in the analysis chamber; infrared multi-detectors generating an electrical measurement quantity based on the absorption of radiation by the gas; a suction pump creating a depression inside the analysis chamber; and an electronic control unit determining a main automotive refrigerant gas concentration and the contaminant gases concentration, based on electrical measurement quantities provided by the multi-detectors and a reference electrical quantity. The control unit controls the pump to suck the gases in the analysis chamber until a condition of absence of gases is achieved, wherein the internal pressure of the chamber reaches a minimum pressure, and then determines the reference electrical quantity, based on the electrical quantity generated in the condition of absence of gases.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: February 10, 2015
    Assignee: Texa S.p.A.
    Inventors: Manuele Cavalli, Roberto Giudici
  • Patent number: 8850877
    Abstract: In a reforming driving mode, while the EGR valve is opened to recirculate a part of exhaust gas into the intake pipe, a reforming-fuel injector injects a reforming-fuel into an exhaust gas flowing through an EGR pipe. The injected reforming-fuel is vaporized and flows into the fuel-reforming catalyst. The fuel-reforming catalyst reforms the fuel in the exhaust gas into the fuel having high combustibility. In the reforming driving mode, the computer determines whether an air-fuel ratio within the normal range. Based on this result, the computer determines whether the reforming-fuel injector has a malfunction. When the reforming-fuel injector has a malfunction, a fail-safe processing is conducted to prohibit the reforming-fuel injector from injecting the reforming-fuel.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: October 7, 2014
    Assignee: Denso Corporation
    Inventors: Hiroyuki Inuzuka, Makoto Miwa
  • Patent number: 8844343
    Abstract: An exhaust gas recirculation diagnosis device may include an EGR module that supplies an intake manifold with exhaust gas from an exhaust manifold, a MAP (manifold absolute pressure) sensor that measures pressure of the intake manifold, and a control portion that controls the EGR module such that the flow rate of the exhaust gas that is supplied from the exhaust manifold to the intake manifold is controlled by stages and monitors the value of the MAP sensor in a fuel cut off condition to diagnose whether the EGR module is faulty. The exhaust gas recirculation diagnosis device uses MAP sensor to perform exhaust gas recirculation and to diagnose the fault of the exhaust gas recirculation device.
    Type: Grant
    Filed: June 7, 2012
    Date of Patent: September 30, 2014
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventor: Seungbum Kim
  • Patent number: 8788235
    Abstract: A method for diagnosing an actuator for a boost pressure system of an internal combustion engine, in which the actuator is controlled using a triggering signal, and a state variable of the boost pressure system which is at least an indirect function of the triggering signal is detected. The triggering signal is periodic, and a curve of the values of the state variable is analyzed with regard to at least one periodic characteristic.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: July 22, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Bleile, Thomas Oertel
  • Publication number: 20140196527
    Abstract: A method and device for diagnosing a low pressure exhaust gas recirculation system (LPEGRS) of an internal combustion engine having an intake area for supplying fresh air which includes in succession in the flow direction a first section having a low pressure in which an air mass flow sensor is situated, a compressor and a second section having a high pressure, the engine exhaust area including a second section having a low exhaust gas pressure, and the LPEGRS which has an adjustable LPEGR valve recirculating at least a portion of the exhaust gas in the second section of the exhaust area to the first section of the intake area.
    Type: Application
    Filed: January 16, 2014
    Publication date: July 17, 2014
    Applicant: Robert Bosch GmbH
    Inventors: Thomas BOSSMEYER, Stefan Motz, Jens Pawlak
  • Publication number: 20140144219
    Abstract: An absolute value of a deviation of an actual EGR ratio, calculated in a current operational status of an engine 1, from a target EGR ratio set on the basis of current operational status of the engine 1 is acquired and is multiplied by a quotient, as gain, acquired from division of a feedback correction amount of opening degree of an EGR valve 12 by an upper limit of the feedback correction amount to determine normality when an acquired product is close to “0” and determine higher degree of abnormality the further the product is away from “0”.
    Type: Application
    Filed: July 9, 2012
    Publication date: May 29, 2014
    Applicant: HINO MOTORS, LTD.
    Inventors: Hironori Narita, Munechika Tsutsumi, Hitoshi Nakano
  • Patent number: 8725386
    Abstract: A method of modeling and testing the effectiveness of an EGR cooler. The cooler effectiveness is mathematically modeled as a function of various temperatures and over an operation history that includes one or more engine shut-downs.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: May 13, 2014
    Assignee: Southwest Research Institute
    Inventors: Magdi K. Khair, Qilong Lu
  • Patent number: 8682569
    Abstract: A system for diagnosing a switchable roller finger follower (SRFF) and an oil control valve (OCV) includes a signal monitoring module and a fault detection module. The signal monitoring module receives at least one of an individual cylinder fuel correction (ICFC) signal and an air/fuel ratio imbalance (AFIM) signal when: an engine speed signal is within a predetermined range of speed; an engine load signal is within a predetermined range of load; and a charcoal canister vapor signal is within a predetermined range of flow rate. The fault detection module detects a fault of at least one of a SRFF and an OCV based on an exhaust gas recirculation value and at least one of the ICFC and AFIM signals. The ICFC and AFIM signals are generated based on: an engine position signal; and at least one of an oxygen signal and a wide range air fuel signal.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: March 25, 2014
    Inventors: Andrew P. Bagnasco, Joshua D. Cowgill, Joseph R. Dulzo, Raymond Claude Turin, Matthew A. Wiles
  • Patent number: 8677748
    Abstract: An apparatus includes an operating conditions module that interprets a number of compressor operating parameters; a compressor flow module that determines a compressor inlet flow in response to the number of compressor operating parameters; and a fresh air flow module that provides a fresh air flow value in response to the compressor inlet flow. The operating conditions module further interprets a current mass air flow value, and the apparatus further includes a mass air flow sensor trimming module that adjusts a mass air flow sensor drift value in response to the current mass air flow value and the fresh air flow value. The apparatus includes a diagnostics module that determines a mass air flow sensor is failed in response to the current mass air flow value and the fresh air flow value.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: March 25, 2014
    Assignee: Cummins Inc.
    Inventors: Indranil Brahma, Ashwin Vyas, Vivek Anand Sujan, Phanindra Garimella, John N. Chi, Abdoul Karim Abdoul Azizou
  • Publication number: 20140060503
    Abstract: An apparatus for determining a condition of an exhaust gas recirculation (EGR) cooler of an internal combustion engine includes a clean EGR cooler module that is configured to estimate the temperature of exhaust gas exiting a clean EGR cooler. The apparatus also includes a fouled EGR cooler module that is configured estimate the temperature of exhaust gas exiting a fouled EGR cooler. Further, the apparatus includes an EGR cooler effectiveness module that is configured to determine a normalized effectiveness of the EGR cooler based on the estimated temperature of exhaust gas exiting a clean EGR cooler and the estimated temperature of exhaust gas exiting a fouled EGR cooler. Additionally, the apparatus includes an EGR cooler condition module that is configured to determine a condition of the EGR cooler based on the normalized effectiveness of the EGR cooler.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Inventors: Jie Zhu, Linsong Guo
  • Patent number: 8649961
    Abstract: A method to operate an electronic controlled internal combustion engine to perform on board NOx emissions level diagnostics. In one embodiment, the method may include operating the engine to maintain a predetermined temperature for a predetermined period of time, determining whether the engine operating status is stable for one of cruise control, idle engine speed, engine torque, or high idle regeneration for a predetermined period of time, cycling the EGR valve between a first position for a predetermined period of time and then in a second position for a predetermined period of time, a determining a change in engine out NOx levels to determine whether an engine component or system is malfunctioning.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 11, 2014
    Assignee: Detroit Diesel Corporation
    Inventors: Jeffery Scott Hawkins, Marc Christian Allain, Justin R. Kollien
  • Patent number: 8631691
    Abstract: An abnormality detection device for detecting abnormalities in an EGR device for an internal combustion engine with a supercharger. The abnormality detection device includes an O2 sensor which is installed in an EGR path and disposed on the exhaust path side relative to the EGR valve, and an A/F sensor which is installed in the exhaust path and disposed downstream of a connecting portion between the exhaust path and the EGR path.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: January 21, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Takayoshi Tanaka
  • Patent number: 8620565
    Abstract: A control system (36) for comparing engine speed data to an engine speed threshold above which the engine is considered to be running (40), for comparing engine temperature data to an engine temperature threshold (60), and once engine speed data has become greater than the engine speed threshold, for causing engine torque to be limited to an engine torque limit until the first to occur of: engine temperature data exceeding the engine temperature threshold, a first timer (44), started upon engine speed data having become greater than the engine speed threshold, having timed to a time that is a function of engine temperature data, and a second timer (54), started upon engine speed data having become greater than the engine speed threshold and engine oil pressure data having become greater than an engine oil pressure threshold, having timed to a time that is also a function of engine temperature data.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: December 31, 2013
    Assignee: International Engine Intellectual Property Company, LLC.
    Inventor: Stephen L. Kadolph
  • Patent number: 8596114
    Abstract: A method and a system for monitoring exhaust gas recirculation are provided that measures a state of an engine, judges an applied system between a high-pressure EGR system and a low-pressure EGR system according to the measured state of the engine, and judges whether a system is erroneous by measuring the position of an EGR valve of an unapplied EGR system and comparing the position with a predetermined reference position.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: December 3, 2013
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventor: Kihoon Nam
  • Patent number: 8594908
    Abstract: An intake system for an internal combustion engine includes an intake passage connected with an intake port of the internal combustion engine; an EGR passage merged with the intake passage at a junction portion; a gas sensor attached to the intake passage and configured to detect a concentration of specific gas; and a control section configured to control the internal combustion engine on the basis of an output signal of the gas sensor. A diameter-enlarged portion having an inner diameter larger than an inner diameter of the junction portion is formed at a portion of the intake passage which is located on a downstream side of the junction portion. The gas sensor is located downstream from the diameter-enlarged portion.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: November 26, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takaya Yoshikawa, Tomohiro Tajima, Masao Tsuzuki
  • Publication number: 20130298654
    Abstract: In a method for diagnosing a valve in a fluid supply line to a suction line of an air system of a combustion engine, the fluid supply line being is part of an exhaust-gas recirculation system or a crankcase ventilation system, when the valve is actuated, a first pressure in the suction line is monitored for change, and an error of the valve is detected if the change of the first pressure lies outside a specific reference range when the valve is actuated.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 14, 2013
    Applicant: ROBERT BOSCH GMBH
    Inventors: Matthias HEINKELE, Michael DRUNG, Martin KROENER
  • Patent number: 8511154
    Abstract: A method for estimating a cylinder air charge for an internal combustion engine includes determining a first volumetric efficiency corresponding to engine operation with an open exhaust gas recirculation valve, determining a second volumetric efficiency corresponding to engine operation with a closed exhaust gas recirculation valve, determining a cylinder air charge using a selected one of the first and second volumetric efficiencies.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: August 20, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Yue-Yun Wang, Ibrahim Haskara
  • Patent number: 8474310
    Abstract: A valve freeze control apparatus for an internal combustion engine includes a concentration sensor, a valve, a freeze control device, and a start determination unit. The concentration sensor is adapted to detect an alcohol concentration of fuel supplied to the internal combustion engine. The valve is provided in one of an intake passage and an exhaust passage of the internal combustion engine, wherein the valve controls flow of air that passes through the one of the intake and exhaust passages. The freeze control device is adapted to limit malfunction of the valve caused by freeze of water in exhaust gas, and the water has been attached to the valve. The start determination unit determines to start the freeze control device when the alcohol concentration detected by the concentration sensor is equal to or greater than a reference value.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: July 2, 2013
    Assignee: Denso Corporation
    Inventor: Takeshi Fujimoto
  • Publication number: 20130145830
    Abstract: An exhaust gas recirculation diagnosis device may include an EGR module that supplies an intake manifold with exhaust gas from an exhaust manifold, a MAP (manifold absolute pressure) sensor that measures pressure of the intake manifold, and a control portion that controls the EGR module such that the flow rate of the exhaust gas that is supplied from the exhaust manifold to the intake manifold is controlled by stages and monitors the value of the MAP sensor in a fuel cut off condition to diagnose whether the EGR module is faulty. The exhaust gas recirculation diagnosis device uses MAP sensor to perform exhaust gas recirculation and to diagnose the fault of the exhaust gas recirculation device.
    Type: Application
    Filed: June 7, 2012
    Publication date: June 13, 2013
    Applicants: Kia Motors Corporation, Hyundai Motor Company
    Inventor: Seungbum KIM
  • Publication number: 20130145831
    Abstract: A method and a system for monitoring exhaust gas recirculation are provided that measures a state of an engine, judges an applied system between a high-pressure EGR system and a low-pressure EGR system according to the measured state of the engine, and judges whether a system is erroneous by measuring the position of an EGR valve of an unapplied EGR system and comparing the position with a predetermined reference position.
    Type: Application
    Filed: September 11, 2012
    Publication date: June 13, 2013
    Applicants: Kia Motors Corporation, Hyundai Motor Company
    Inventor: Kihoon Nam
  • Patent number: 8408056
    Abstract: An EGR ratio measuring device comprises a pair of nondispersive infrared gas analyzers that correct a water influence and measure a concentration of CO2 in a gas containing water, an intake air introduction line that is connected to an intake air pipe of an internal combustion engine and introduces a part of the intake air into one nondispersive infrared gas analyzer without removing the water, an exhaust gas introduction line that is connected to an exhaust gas pipe of the internal combustion engine and introduces a part of the exhaust gas into the other nondispersive infrared gas analyzer without removing the water, and a temperature adjusting mechanism that keeps a temperature of whole of the introduction lines and a temperature of the nondispersive infrared gas analyzers so as not to condense dew.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 2, 2013
    Assignee: Horiba, Ltd.
    Inventors: Tomoshi Yoshimura, Masaru Miyai
  • Patent number: 8386153
    Abstract: An internal combustion engine includes at least two cylinders, an intake duct, an exhaust gas section and an exhaust gas recirculation line. The cylinders include a combustion chamber. The intake duct communicates with the combustion chambers via a cylinder inlet channel of the intake duct depending upon a switch position of a gas inlet valve. The exhaust gas section communicates with the combustion chambers depending upon a switch position of at least one gas outlet valve. Exhaust gas is guided back to the inlet channels via the exhaust gas recirculation line dependent upon a switch position of the exhaust gas recirculation valve. To detect a mixing air temperature in the inlet channels, a mixing air temperature sensor is provided. The determined mixing air temperatures are compared. Exhaust gas guided back due to uneven distribution is identified if a difference between the determined mixing air temperature is greater than a predetermined threshold value.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: February 26, 2013
    Assignee: Continental Automotive GmbH
    Inventors: Gianluca Caretta, Manfred Weigl
  • Patent number: 8346462
    Abstract: A determination is made more simply as to a malfunction of a low pressure EGR device that supplies an EGR gas from a low pressure EGR passage connecting between an exhaust passage at a location downstream of a turbine and an intake passage.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: January 1, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshitaka Nakamura, Hiroshi Sawada, Toru Kidokoro, Shinya Taira
  • Patent number: 8342015
    Abstract: A method for diagnosing a failure of an EGR circuit of an engine including an EGR exchanger, an EGR valve, a bypass duct of the EGR exchanger, and a bypass flap arranged upstream from the EGR exchanger and the bypass duct to adjust a proportion of exhaust gases flowing therethrough. The EGR circuit can be activated according to a cooled mode, in which the flap is shut, or according to a bypass mode, in which the flat is open. The method carries out, during a diagnosis phase, two activations of the flap, and measures an average of variations of the EGR gas temperature at an outlet of the EGR exchanger during the diagnosis phase.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: January 1, 2013
    Assignee: Renault S.A.S.
    Inventors: Julien Allard, Clement Petit, Ronan Le-Bras
  • Publication number: 20120240671
    Abstract: An object of the present invention is to accurately detect an abnormality in an EGR device for an internal combustion engine with a supercharger, or more specifically, the inability of an EGR valve to fully close due, for instance, to trapped foreign matter. To achieve the object, the present invention provides an abnormality detection device for the EGR device. The abnormality detection device includes an O2 sensor which is installed in an EGR path and disposed on the exhaust path side relative to the EGR valve, and an A/F sensor which is installed in the exhaust path and disposed downstream of a connecting portion between the exhaust path and the EGR path. The abnormality detection device uses a signal output from the O2 sensor and a signal output from the A/F sensor to judge whether the EGR device is abnormal.
    Type: Application
    Filed: December 9, 2010
    Publication date: September 27, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Takayoshi Tanaka
  • Patent number: 8205606
    Abstract: An engine processor (38) processes data for inferring temperature of exhaust gas at an exhaust manifold (18) of an internal combustion engine (10) whose exhaust system (16) contains an after-treatment device (26, 28) for treating exhaust gas and a sensor (30) for providing data for temperature of exhaust gas entering the after-treatment device. The processor processes data from the sensor and other data to infer temperature of exhaust gas at the exhaust manifold by executing an algorithm (FIGS. 3 and 4) that models temperature of exhaust gas at the exhaust manifold as a function of data from the sensor and the other data, including certain constants, certain geometry of the exhaust system, and certain variables related to operation of the engine.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: June 26, 2012
    Assignee: International Engine Intellectual Property Company, LLC
    Inventors: Rogelio Rodriguez, Smitha Vempaty, Tashmin Lopa
  • Patent number: 8201442
    Abstract: A system and method are provided for estimating an instantaneous EGR mass flow rate corresponding to a flow rate of exhaust gas through an exhaust gas recirculation (EGR) conduit fluidly coupled between an exhaust manifold and an intake manifold of an internal combustion engine with an EGR cooler positioned in-line with the EGR conduit. An operating position of the engine is monitored, and the instantaneous EGR mass flow rate is estimated at each of a plurality of fixed increments of the engine position based on EGR cooler outlet temperature, intake manifold pressure and a pressure differential across a flow restriction disposed in-line with the exhaust gas conduit between the EGR cooler and the intake manifold.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: June 19, 2012
    Assignee: Cummins Inc.
    Inventors: Andrew W. Osburn, Martin T. Books, Richard E. Reisinger, Albert E. Sisson
  • Patent number: 8196569
    Abstract: In a method for operating an internal combustion engine having exhaust gas recirculation, air is supplied to at least one combustion chamber via an intake manifold at least partially closable with the aid of a final control element, and a part of the exhaust gases flowing into an exhaust pipe is conducted via an EGR channel, which is at least partially closable with the aid of an EGR valve unit, into an area of the intake manifold, which lies between the final control element and the combustion chamber. A first variable, which characterizes the mass flow of the gas conducted through the EGR channel, is ascertained from a set of state variables of the internal combustion engine, which apply for an operating state in which the engine is in overrun operation and the final control element is essentially closed.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: June 12, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Thomas Bleile, Horst Mueller
  • Publication number: 20120130618
    Abstract: A method for diagnosing a malfunction of a sensor system in an air system of an internal combustion engine, said sensor system comprising a first air state sensor, a second air state sensor and a third air state sensor, wherein a first value and a second value of a first comparison variable are ascertained in two different ways in an overall calculation step such that the result of a comparison between the first value and the second value is a function of each of the output variables of the first, second and third air state sensors and wherein in a fault detection step, said method recognizes as a function of the comparison between said first value and said second value of the comparison variable that a fault exists in the sensor system.
    Type: Application
    Filed: November 21, 2011
    Publication date: May 24, 2012
    Applicant: ROBERT BOSCH GMBH
    Inventors: Thomas Bleile, Wilhelm Blumendeller, Daniel Kuhn, Julian Reichel
  • Publication number: 20120096855
    Abstract: A system for improving operation of an EGR system is presented. The system provides distinct models to estimate EGR temperature in response to a valve position. In one example, the system can judge EGR system operation when a state of a control valve is adjusted during driving conditions.
    Type: Application
    Filed: October 20, 2010
    Publication date: April 26, 2012
    Applicant: Ford Global Technologies, LLC
    Inventor: Mary Catherine Farmer
  • Patent number: 8136391
    Abstract: An EGR fault in an engine is detected by comparing actual MAP values with inferred MAP values, the latter being based on MAF and engine speed. Multiple pairs of inferred and actual MAP, some having low EGR and other having high EGR rate. The two values are expected to deviate at high EGR rate and to be nearly equal at low EGR rate. If no such deviation at high EGR, then a fault is determined. According to the present disclosure, the computation of inferred MAP includes a compensation for flow into the intake through a carbon canister system. Without such compensation, the EGR routine is applied to situations without flow from the canister. Such a limitation caused a problem in HEV vehicles, in which engine operating time is less than typical engine installations. Additionally, the confounding effects of rapid VVT movement are excluded from the computations.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: March 20, 2012
    Assignee: Ford Global Technologies, LLC
    Inventors: Douglas Raymond Martin, Richard Paul Taylor
  • Patent number: 8069711
    Abstract: A method and a device for detecting faulty functioning of actuators in the air system on internal combustion engines, an actuator being operated using at least two control states, one after the other, at least one sensor, whose output signal is a function of the excursion state of the actuator, reading out the output signal of this sensor being undertaken, and an assessment of the function of the controlled actuator being undertaken from the response of this output signal to the change of the control of the actuator, during the control of the actuator, at least the control of those other actuators included in the air system being kept constant as well as additional control signals for operating the internal combustion engine, which have an influence on the output signal of the sensor.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: December 6, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Michael Gebers, Joachim Wagner
  • Publication number: 20110247407
    Abstract: A method for diagnosing a failure of an EGR circuit of an engine including an EGR exchanger, an EGR valve, a bypass duct of the EGR exchanger, and a bypass flap arranged upstream from the EGR exchanger and the bypass duct to adjust a proportion of exhaust gases flowing therethrough. The EGR circuit can be activated according to a cooled mode, in which the flap is shut, or according to a bypass mode, in which the flat is open. The method carries out, during a diagnosis phase, two activations of the flap, and measures an average of variations of the EGR gas temperature at an outlet of the EGR exchanger during the diagnosis phase.
    Type: Application
    Filed: April 4, 2011
    Publication date: October 13, 2011
    Applicant: RENAULT S. A. S.
    Inventors: Julien ALLARD, Clement PETIT, Ronan LE-BRAS
  • Patent number: 8028569
    Abstract: A method for providing a specification about an efficiency of a cooler for recirculated exhaust gas in an internal combustion engine includes: measuring a temperature of the recirculated exhaust gas cooled by the cooler; and ascertaining the specification about the efficiency of the cooler as a function of the measured temperature of the cooled recirculated exhaust gas. With the aid of the specification about the efficiency of the cooler it is possible to determine a failure of the cooler or to calculate a temperature of the recirculated exhaust gas in order implement an engine control system of the internal combustion engine on the basis of a reliable temperature specification that is not influenced by lag effects.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: October 4, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Wilhelm Blumendeller, Horst Mueller
  • Publication number: 20110184632
    Abstract: A method for estimating an oxygen concentration in an intake manifold of a diesel engine utilizing exhaust gas recirculation includes monitoring engine operation, monitoring an exhaust gas recirculation valve, and monitoring an exhaust air fuel ratio. When the engine operates in steady state with the exhaust gas recirculation valve in the closed position, a volumetric efficiency for the engine is updated. A partial pressure due to exhaust gas recirculation within the intake manifold based upon the updated volumetric efficiency is determined, and an estimated oxygen concentration within the intake manifold based upon the partial pressure due to exhaust gas recirculation within the intake manifold and the exhaust air fuel ratio is determined Operation of the engine is controlled based upon the estimated oxygen concentration within the intake manifold.
    Type: Application
    Filed: January 26, 2010
    Publication date: July 28, 2011
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Jun-Mo Kang, Ibrahim Haskara, Chen-Fang Chang, Yue-Yun Wang
  • Publication number: 20110174066
    Abstract: An EGR fault in an engine is detected by comparing actual MAP values with inferred MAP values, the latter being based on MAF and engine speed. Multiple pairs of inferred and actual MAP, some having low EGR and other having high EGR rate. The two values are expected to deviate at high EGR rate and to be nearly equal at low EGR rate. If no such deviation at high EGR, then a fault is determined. According to the present disclosure, the computation of inferred MAP includes a compensation for flow into the intake through a carbon canister system. Without such compensation, the EGR routine is applied to situations without flow from the canister. Such a limitation caused a problem in HEV vehicles, in which engine operating time is less than typical engine installations. Additionally, the confounding effects of rapid VVT movement are excluded from the computations.
    Type: Application
    Filed: June 3, 2010
    Publication date: July 21, 2011
    Applicant: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Douglas Raymond Martin, Richard Paul Taylor
  • Patent number: 7983834
    Abstract: A method and a device for operating an internal combustion engine having at least one mass flow line and a cooling device for cooling the mass flow in the mass flow line, as well as a bypass, having a bypass valve, that bypasses the cooling device. When the bypass valve is opened, the mass flow is conducted at least partly through the bypass. When the bypass valve is closed, the mass flow is conducted through the cooling device. Downstream from the cooling device and from the bypass in the mass flow line, a temperature of the mass flow in the mass flow line is determined. In at least one operating state of the internal combustion engine, a first temporal temperature gradient is determined with closed bypass valve. In the at least one operating state of the internal combustion engine, a second temporal temperature gradient is determined with closed position of the bypass valve.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: July 19, 2011
    Assignee: Robert Bosch GmbH
    Inventor: Wilhelm Blumendeller