Exhaust Gas Diverted From Reactor Or Treating Agent Mixer Patents (Class 60/288)
  • Publication number: 20080178853
    Abstract: The present invention prevents an EGR sensor installed in an engine's EGR path from being soiled by soiling substances in exhaust. A catalyst is positioned upstream of the EGR sensor to purify the soiling substances in EGR gas. The status of the EGR sensor is properly controlled in accordance with the conditions of the catalyst. This ensures the EGR sensor is less likely to be affected by the soiling substances in the exhaust under any circumstances of the EGR path and allows the EGR sensor to avoid a decrease in the accuracy of EGR gas detection. An alternative configuration may be employed such that the EGR gas recirculates from the downstream side of a catalyst installed in a main exhaust path.
    Type: Application
    Filed: November 20, 2007
    Publication date: July 31, 2008
    Applicant: HITACH, LTD.
    Inventors: Shiro YAMAOKA, Eiichiro OHATA, Jun KUBO, Noboru TOKUYASU, Toshiki OTSUKI, Hiroaki HOSHIKA
  • Patent number: 7404290
    Abstract: The present invention relates to an exhaust system for an internal combustion engine, having an exhaust line for removing exhaust gas from the internal combustion engine and having a secondary fuel supply for introducing secondary fuel into the exhaust gas of the internal combustion engine. To improve the introduction of the secondary fuel into the exhaust, a recirculation device is connected to the exhaust line and to the secondary fuel supply so that the introduction of secondary fuel into the exhaust is accomplished via or through the recirculation device. The recirculation device has a circulation space which receives an exhaust substream from the exhaust line in which the secondary fuel is introduced into the exhaust substream and from which the modified exhaust substream is returned to the exhaust line.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: July 29, 2008
    Assignee: J. Eberspaecher GmbH & Co.
    Inventors: Gerd Gaiser, Robert Hanitzsch, Josef Rudelt
  • Patent number: 7402292
    Abstract: One embodiment of a method of operating a NOx abatement system comprises: introducing an exhaust stream to an ammonia generator in a normal flow direction, adsorbing NOx from the exhaust stream in the ammonia generator, diverting the exhaust stream around the ammonia generator, introducing hydrogen to the ammonia generator in a direction opposite the normal flow direction, and generating ammonia within the ammonia generator.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: July 22, 2008
    Assignee: Delphi Technologies, Inc.
    Inventors: Mark D. Hemingway, William J. LaBarge, Haskell Simpkins
  • Patent number: 7398645
    Abstract: A compact reversing flow catalytic converter with protection from overheating includes a valve unit which directs exhaust gases through a container filled with catalytic material to permit a bypass of catalytic material when a temperature of the material exceeds a predetermined threshold. The container defines a U-shaped gas passage that communicates with two ports at the top of the container. The valve unit is mounted to the top of the container and includes an intake and an exhaust cavity. The valve unit includes a valve disk having two openings therethrough. The valve disk rotates around perpendicular central axis between a first, a second and third positions. When overheating of the catalytic material is predicted, a controller relinquishes control of the valve disk and a center return mechanism rotates the valve disk to a third position, in which each of the openings communicates with both ports so that the exhaust gas flow bypasses catalytic material.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: July 15, 2008
    Assignee: Smart Muffler Corporation
    Inventors: Ming Zheng, Edward A. Mirosh, Graham T. Reader
  • Publication number: 20080163607
    Abstract: A dual NOx trap system for reducing NOx emissions from an internal combustion engine. The system is plumbed and controlled such that the NOx adsorption time of a trap is decoupled from the NOx regeneration time. A trap is taken out of service for regeneration only for the minimum required regeneration time and then is placed back into service. Because regeneration times are short relative to adsorption times, during most of the working life of the assembly both of the traps are in service in NOx-trapping mode. Thus, higher NOx-trapping efficiencies are provided over most of the working life of the system because each unit volume of catalyst is in service for more than 50% of the time, permitting a smaller volume of catalyst for each trap than in a prior art system. Further, shorter off-line regeneration times result in reduced cooling of the traps during regeneration.
    Type: Application
    Filed: January 5, 2007
    Publication date: July 10, 2008
    Inventors: Thomas W. Silvis, Joseph V. Bonadies
  • Publication number: 20080155968
    Abstract: An apparatus, system, and method are disclosed for enhancing the efficiency of an exhaust aftertreatment application. The method may include determining the current operating conditions of the application, the optimal operating conditions of a target component, and the performance criteria of a conditioning component relative to the optimal operating conditions. The method may include determining an optimal fraction of an exhaust flow to pass through the conditioning component to achieve the optimal operating conditions of the target component. The method may further include manipulating a bypass valve position based on the optimal fraction of exhaust flow to pass through the conditioning component. The target component may be a selective catalyst reduction (SCR) component that operates optimally at a designed NO2/NOx mole ratio. The conditioning component may be a diesel oxidation catalyst (DOC) that affects the NO2/NOx mole ratio.
    Type: Application
    Filed: December 29, 2006
    Publication date: July 3, 2008
    Inventors: Gary Salemme, Hasan Mohammed
  • Patent number: 7393509
    Abstract: The present invention provides a honeycomb structure 1 comprising partition walls 2 so as to form a plurality of cells 3 extending from one end face 42 to the other end face 44, and a plug portion 4 plugging the cell 3 at the end face 42 and/or 44. In the honeycomb structure 1, the plug portion 4 has a hollow and convex shape, and at least a part of the plug portion 4 is protruding from the end face.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: July 1, 2008
    Assignee: NGK Insulators, Ltd.
    Inventor: Shinji Yamaguchi
  • Patent number: 7370474
    Abstract: An exhaust gas purifying equipment for a diesel engine having a first continuous regeneration type DPF (12) in an exhaust passage (7) of an engine (2), a second continuous regeneration type DPF (13) in a bypass passage (101), a switching valve (102) for switching the flow path of an exhaust gas, an exhaust temperature raising means, an exhaust temperature area detector, and a controller controlling the exhaust temperature raising means and the switching valve (102), wherein the controller operates the exhaust temperature raising means and at the same time executes the post-injection, and, furthermore, controls the switching valve (102) so that the exhaust gas passes through the second continuous regeneration type DPF (13), in the case where the exhaust temperature area of an engine (2) detected by the exhaust temperature area detector is in an extremely low temperature area (Z2) of which the exhaust temperature is lower than that of a predetermined temperature area.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: May 13, 2008
    Assignee: Isuzu Motors Limited
    Inventor: Toshitaka Minami
  • Patent number: 7367180
    Abstract: Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: May 6, 2008
    Assignee: Ford Global Technologies LLC
    Inventors: Gopichandra Surnilla, Christian T. Goralski, Jr., Stephen B. Smith
  • Patent number: 7350349
    Abstract: Method and device for a particle filter for an exhaust system for a combustion engine, wherein the filter is regenerated by spontaneous combustion of particles accumulated in the filter. Exhaust gases from the combustion engine are led, during operation, past the filter when the counterpressure in the exhaust gases which is caused by the filter exceeds a certain level. The invention also relates to a silencer in a vehicle which is driven by the combustion engine.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: April 1, 2008
    Assignee: Scania CV AB (publ)
    Inventor: Klas Olofsson
  • Patent number: 7351381
    Abstract: The present invention relates to a gas treatment apparatus for treating the exhaust gas stream from an internal combustion engine. The apparatus comprises several compartments within which one or more treatments are to be performed upon a gas flowing through the compartments. At least one compartment includes a treatment element secured against axial movement at each end. The treatment element is secured at least at one end by removable axial retaining apparatus. The removable axial retaining apparatus includes a secured member secured against axial movement. The treatment element is removable from within the compartment by axial movement after the removable axial retaining apparatus has been removed.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: April 1, 2008
    Assignee: Eminox Limited
    Inventors: William Frederick Ball, Anthony John Gault, Charles Patrick Harrod
  • Patent number: 7344649
    Abstract: A method for removal of dissolved oxygen from organic liquids by use of a solid state catalyst. In doing so the dissolved oxygen is converted by the action of a reducing agent into water.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: March 18, 2008
    Assignee: Degussa AG
    Inventors: Hubert Redlingshöfer, Andreas Dörflein, Christoph Weckbecker
  • Patent number: 7343736
    Abstract: An apparatus for the reduction of nitric oxides (NOx) and particulate matter of exhaust emissions from a diesel engine having an electronic control module. The apparatus includes a first treatment device for reducing particulate matter and a second treatment device for reducing NOx emissions from the engine exhaust. The apparatus also includes a first valve in fluid communication with the exhaust inlet from the engine and a second valve in fluid communication with a common exhaust outlet. The first and second valves are in fluid communication with each other through a fluid connection extending therebetween.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: March 18, 2008
    Assignee: Detroit Diesel Corporation
    Inventor: Yury Kalish
  • Patent number: 7334400
    Abstract: An exhaust aftertreatment system comprising two or more branches, at least one of which contains a NOx adsorber-catalyst. The branches unite downstream into a trailing conduit that contains an ammonia-SCR catalyst. Ammonia generated by the NOx adsorber-catalyst during regeneration is stored for later use by the SCR catalyst. One advantage of this configuration is a continuous or near continuous presence of oxygen within the trailing exhaust conduit. The continuous presence of improves the efficiency of the SCR catalyst. Another concept is to configure a multi-branch exhaust aftertreatment system without valves, dampers, or other electronically controlled devices adapted to selectively alter the distribution of the exhaust between the branches. The absence of such devices generally results in a comparatively balanced division of exhaust between the branches. One benefit of this configuration is improved reliability as compared to systems that use valves.
    Type: Grant
    Filed: September 10, 2005
    Date of Patent: February 26, 2008
    Assignee: Eaton Corporation
    Inventors: Jiyang Yan, James Edward McCarthy, Jr., Haoran Hu
  • Patent number: 7325396
    Abstract: An exhaust manifold includes an open/close valve that switches between either closing or opening the exhaust path of a collection section, and switches the exhaust path of the exhaust gas between passing through or not passing through a bypass path containing an upstream catalyst. There is a partition wall structure in a pipe-mounting member so that when the valve is closed such that the exhaust gas during cold start is led to the upstream catalyst, the exhaust paths for each of the branch pipes on the upstream side of the valve inside a collection section are independent from one another. When the valve is closed, the downstream side of each of the branch pipes is not continuous inside the collection section, so the flow of air is prevented in this section, and exhaust interference and loss of exhaust heat are reduced.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: February 5, 2008
    Assignee: Aisin Takaoka Co., Ltd.
    Inventor: Takuya Kajita
  • Publication number: 20080010979
    Abstract: An exhaust gas purification apparatus for an engine includes an exhaust gas bypass connected to the engine, a muffler connected to the exhaust gas bypass, and a catalytic carrier. The muffler defines an outlet communicating with the atmosphere. The catalytic carrier defines a through-hole for receiving catalyst. The catalytic carrier is mounted in the muffler, and at the outlet of the muffler. The through-hole of the catalytic carrier communicates with the atmosphere via the outlet.
    Type: Application
    Filed: July 13, 2006
    Publication date: January 17, 2008
    Inventors: Ting-Chi Kao, Yu-Hsuan Cho, Chi-Ho Chou
  • Patent number: 7313912
    Abstract: A secondary air pipe is connected to an exhaust pipe upstream of a catalyst, and a secondary air pump is connected to an upstream portion of the secondary air pipe. An ECU determines an operating period of the secondary air pump before the secondary air pump is operated in order to drive the secondary air pump within the operating period. Especially, the ECU detects a pump driving load during a secondary air supply to correct the operating period of the secondary air pump based on the detected pump driving load.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: January 1, 2008
    Assignee: Denso Corporation
    Inventors: Singo Nakata, Tomoaki Nakano
  • Patent number: 7310941
    Abstract: An exhaust gas purification system has a first accumulation quantity estimation device that estimates an accumulation quantity of exhaust particulate matters collected by a diesel particulate filter (DPF) based on a flowing state of exhaust gas and a second accumulation quantity estimation device that estimates the accumulation quantity based on an operating state of an engine. The first estimation device is employed only when a flow rate of the exhaust gas is equal to or greater than a predetermined value and the engine is in a steady operating state. Otherwise, the second estimation device is employed. The exhaust gas flow rate is increased if the estimation by the second estimation device continues for a long time. Thus, an opportunity to perform the accumulation quantity estimation with the first estimation device is increased, and accumulation accuracy is improved.
    Type: Grant
    Filed: January 19, 2006
    Date of Patent: December 25, 2007
    Assignee: Denso Corporation
    Inventors: Tsukasa Kuboshima, Shigeto Yahata
  • Patent number: 7296401
    Abstract: A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device includes a particulate filter arranged in the exhaust system, which carries a catalyst for absorbing and reducing NOx. The catalyst absorbs NOx when the air-fuel ratio in the surrounding atmosphere thereof is lean and releases the absorbed NOx to purify NOx by reduction when the air-fuel ratio is stoichiometric or rich. The device further includes a catalytic apparatus for purifying NOx arranged in the exhaust system upstream of the particulate filter, which has an oxidation function.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 20, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takamitsu Asanuma, Toshiaki Tanaka, Shinya Hirota, Kazuhiro Itoh, Koichiro Nakatani, Koichi Kimura, Kotaro Hayashi, Souichi Matushita, Yukihiro Tsukasaki
  • Patent number: 7296403
    Abstract: An internal combustion engine exhaust gas recirculation system. A turbine section of a turbocharger is coupled to an exhaust manifold of the engine. A compressor section has an output coupled to an intake manifold of the engine. The exhaust gas aftertreatment system is coupled to an output of the turbine section. The exhaust gas aftertreatment system includes a particulate filter having: a housing of an outer wall and an inner wall; a particulate filtering section disposed within the inner wall of the housing; and a channel formed between the inner wall and the outer wall. The channel created by the outer wall includes: an inlet disposed downstream of the filtering section for receiving a portion of exhaust gasses exiting the filtering section, and an outlet coupled to the input of the compressor section of the turbine for transporting the exhaust gasses received by the inlet of the channel to an input of the compressor section.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: November 20, 2007
    Assignee: Ford Global Technologies, LLC
    Inventor: Michael S. Goebelbecker
  • Patent number: 7275366
    Abstract: An emissions control system utilizes otherwise wasted heat to efficiently reduce emissions in a main exhaust flow. Heat stored in exhaust from an auxiliary generator (i.e., auxiliary exhaust) may be used to convert urea to ammonia used by a Selective Catalytic Reducer (SCR) system, and/or the auxiliary exhaust may be used to heat the main exhaust flow before entry into an SCR. Additionally, a heat exchanger may be used to transfer heat from a hot clean flow out of the SCR, to the main exhaust flow entering the SCR. Previously, mobile emissions control systems have not used SCR systems to reduce NOx because of the cost and space required for heater fuel. The efficient use of otherwise wasted heat reduces fuel cost and fuel storage requirements, and thereby makes an SCR systems feasible for use in mobile emissions control systems.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: October 2, 2007
    Assignee: Advanced Cleanup Technologies, Inc.
    Inventors: John G. Powell, Salvador Caro, Henning Ottsen
  • Patent number: 7263823
    Abstract: A system for measuring NOx content of an exhaust gas produced includes at least one controllable valve operable to direct exhaust gas to a NOx sensor only when measurement of the NOx content is desired and to otherwise expose the NOx sensor to ambient air. A control circuit controls the operation of the at least one valve and determines the NOx content of the exhaust gas based on sensory data received from the NOx sensor.
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: September 4, 2007
    Assignee: Cummins, Inc.
    Inventors: Eric B. Andrews, Jeffrey M. Weikert
  • Patent number: 7263824
    Abstract: An exhaust gas aftertreatment device for an internal combustion engine comprises an inlet configured to receive the exhaust gas, an outlet from which the exhaust gas exits the device, a first passageway defined between the inlet and the outlet, and a second passageway defined between the inlet and the outlet, wherein the second passageway is separate from the first passageway. A first aftertreatment element is disposed in the first passageway. In one embodiment, the device is a diesel oxidation catalyst device and the second passageway represents a bypass passageway. The second passageway may further have a second aftertreatment element disposed therein. In an alternative embodiment, the device is a NOx aftertreatment element, and a second aftertreatment element is disposed in the second passageway. In either case, the device includes an exhaust gas flow control mechanism configured to selectively control exhaust gas flow through the first and second passageways.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: September 4, 2007
    Assignee: Cummins, Inc.
    Inventors: Steven M. Bellinger, Thomas M. Yonushonis
  • Patent number: 7260927
    Abstract: Disclosed is an intelligent, full-featured diesel engine exhaust treatment system, including: an exhaust flowing zone, a microcomputer processor, and an exhaust detecting device, the exhaust flowing zone defining a first exhaust treatment path and a second exhaust treatment path, the microcomputer processor selectively employing a soot filter and a catalyst converter to purify the engine exhaust based on the state of contaminants in the engine exhaust as detected by the exhaust detecting device.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: August 28, 2007
    Assignee: Trivision Technology Taiwan Co., Ltd.
    Inventor: Paul Hsu
  • Patent number: 7251929
    Abstract: In an exhaust aftertreatment system comprising a NOx adsorber-catalyst followed by an SCR catalyst, means are provided for preventing the SCR catalyst from becoming heated to near the same peak temperatures as the NOx adsorber-catalyst during desulfation. In one embodiment, the means is a thermal mass between the NOx adsorber-catalyst and the SCR catalyst. In another embodiment, the means is a valve configured to selectively divert exhaust leaving the NOx adsorber-catalyst from the SCR catalyst. In a method of the invention, the NOx adsorber-catalyst temperature is cycled during desulfation. The peaks of the cycles are within an appropriate temperature range for desulfating the NOx adsorber-catalyst, but the average temperature is below the temperature range at which the SCR catalyst is damaged. The temperature peaks are damped as they travel from the NOx adsorber-catalyst to the SCR, whereby the SCR experiences much lower peak temperatures than the NOx adsorber-catalyst.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: August 7, 2007
    Assignee: Eaton Corporation
    Inventors: Haoran Hu, James Edward McCarthy, Jr., Jiyang Yan
  • Patent number: 7251932
    Abstract: A reconfigurable exhaust system provides selective positioning of exhaust gas treatment devices either near, or spaced from, the exhaust gas outlet port of a turbine of a turbocharged Diesel engine. In some embodiments, auxiliary air or a heat exchanger are arranged to cool the exhaust gas when required.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: August 7, 2007
    Assignee: Southwest Research Institute
    Inventor: Yiqun Huang
  • Patent number: 7234295
    Abstract: An emission reduction apparatus includes first and second exhaust paths carrying respective first and second Nox traps. One trap has a smaller capacity than the other and is operative while the larger trap regenerates, allowing symmetric operation.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: June 26, 2007
    Assignee: Ricardo UK Limited
    Inventor: Craig Lucas Goodfellow
  • Patent number: 7210287
    Abstract: A method of reducing exhaust emission from a catalytic converter apparatus of a vehicle, the apparatus including at least one catalytic converter, each of the at least one catalytic converter having a catalyst brick positioned within a predefined length of the vehicle. The method includes directing exhaust to pass more than once through the predefined length through at least one of the at least one catalyst brick. The converter apparatus can accelerate catalyst conversion reactions and thus accelerate converter system light-off.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: May 1, 2007
    Assignee: General Motors Corporation
    Inventors: Thomas E. Bolander, Jeffrey J. Allen, Alexander J. Roberts
  • Patent number: 7185489
    Abstract: A particulate trap has a housing and a plurality of filters disposed within the housing. The particulate trap also has a plurality of dividers fluidly isolating one or more of the plurality of filters into filter divisions. The particulate trap has at least one inlet and at least one outlet individually associated with each filter division, and a valve assembly configured to selectively block a flow of exhaust air through each of the inlets.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: March 6, 2007
    Assignee: Caterpillar Inc
    Inventors: Owen Charles Kolstad, Kartik Ganesan Iyer, Kerry Allen Delvecchio, Joanna Louise Williams
  • Patent number: 7171801
    Abstract: A filter system includes a plurality of filter sections, each of the plurality of filter sections receiving a portion of flow. Each filter section includes a first filter, a second filter, an absorbing material disposed between the first and second filter, and at least one dispersion mechanism disposed between the first and second filter. The at least one dispersion mechanism assists in providing a fluid to the filter system.
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: February 6, 2007
    Assignee: Caterpillar Inc
    Inventors: Maarten Verkiel, Jo L. Williams, Eric Charles Fluga
  • Patent number: 7171800
    Abstract: An exhaust gas system of a vehicular internal combustion engine comprises a plurality of exhaust gas catalytic converters having different working temperature ranges. Depending on the temperature of the exhaust gas the latter is directed to the one or those converters into whose working temperature range the exhaust gas temperature falls.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: February 6, 2007
    Assignee: Arvin Technologies, Inc.
    Inventors: Shan Shih, Egon Hassel, Johannes Hartick, Winfried Willeke, Claus Gellermann, Jose-Luis Eguizabal, Gregg Speer, Markus Engelbertz
  • Patent number: 7169364
    Abstract: A particulate filter regenerating device is configured to regenerate a particulate filter that collects particulate from engine exhaust gas. The particulate filter regenerating device is configured to prevent the temperature of the particulate filter from exceeding an allowable temperature during regeneration when the quantity of accumulated particulate is estimated to be lower than it actually is due to variation of the estimate. When the amount of temperature rise per unit time of the particulate filter is larger than a prescribed value during regeneration, it is determined that the temperature of the particulate filter will soon exceed the allowable temperature and the temperature rise amount ?Texh of the exhaust gas is reduced (?Texh1 is the normal temperature rise amount). The larger the temperature rise per unit time is, the more the temperature rise amount of the exhaust gas is reduced.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: January 30, 2007
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Makoto Ohtake, Jun-ichi Kawashima, Naoya Tsutsumoto, Terunori Kondo, Takao Inoue, Toshimasa Koga
  • Patent number: 7159387
    Abstract: Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: January 9, 2007
    Assignee: Ford Global Technologies, LLC
    Inventors: Gopichandra Surnilla, Christian T. Goralski, Jr., Stephen B. Smith, James P. O'Neill, Garry Zawacki
  • Patent number: 7150147
    Abstract: An exhaust system (1) is provided with an exhaust passage that allows exhaust gas discharged from an internal combustion engine to pass therethrough, an exhaust emission control unit including a catalyst (2,3) such as a three-way catalyst (27) to purify the exhaust gas, and an exhaust heat collecting unit that converts thermal energy of the exhaust gas into electric energy. The exhaust passage (25) is formed in the center of the exhaust system provided with the exhaust emission control unit. By-pass passages (26) are formed at both sides of the exhaust passage (25) through which the exhaust gas flows without passing through the exhaust emission control unit. The exhaust heat collecting unit (29) is provided on the outer side of each of the by-pass passages (26).
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: December 19, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kiyohito Murata
  • Patent number: 7117669
    Abstract: The invention relates to systems for removing NOx from exhaust. In one aspect of the invention, after adsorption, an NOx adsorber is isolated from the main exhaust flow and desorption induced by raising the temperature. The desorbed NOx is combined with a reductant and reduced over a catalyst. Preferably, the reductant is syn gas produced in an on-board reformer. The catalyst need never be exposed to the main exhaust flow, which is particularly advantageous for catalysts sensitive to water, oxygen, or sulfur. In another aspect of the invention, a recirculating flow is induced through an NOx adsorber during a regeneration cycle. Recirculation can induce greater desorption at a given temperature, provide a source of heat for the adsorber, and allow a higher conversion rate with a fixed amount of catalyst. A further aspect of the invention relates to a vehicle-mounted adsorbers with provisions for heating.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: October 10, 2006
    Assignee: Eaton Corporation
    Inventors: Wayne Scott Kaboord, Dawn Marie Becher, Fred Joseph Begale, Daniel Woodrow Fellers, John Albert Kovacich, Steven M. Kuznicki
  • Patent number: 7117667
    Abstract: The present invention provides for an NOx adsorber aftertreatment system for internal combustion engines which utilizes a parallel arrangement of an adsorber catalyst and a bypass. The exhaust flow from the engine is routed through the adsorber during lean operation. At a predetermined regeneration time (for example, when the adsorber catalyst is 20% full), the exhaust gas flow is reduced through the parallel leg that contains the adsorber catalyst to be regenerated (e.g., 20% through the catalyst leg, 80% of the flow to the bypass leg). A quantity of hydrocarbon is injected into the reduced-flow catalyst leg in order to make the mixture rich. Since the flow has been reduced in this leg, only a small fraction of the amount of hydrocarbon that would have been required to make the mixture rich during full flow is required. This will result in a substantial reduction in the fuel penalty incurred for regeneration of the adsorber catalyst.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: October 10, 2006
    Assignee: Fleetguard, Inc.
    Inventors: Rahul Mital, Bradlee J. Stroia, Scott Cole
  • Patent number: 7111453
    Abstract: A cost-effective solution to remove particulates from diesel, especially light-duty diesel engines incorporates an oxidation catalyst (2) effective to convert NO in the exhaust from the engine to NO2 and a particulate trap (4) which traps no more than 85% by weight of the particulate, optionally by permitting gas to by-pass the trap.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: September 26, 2006
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Guy Richard Chandler, Martyn Vincent Twigg
  • Patent number: 7093425
    Abstract: A variable flow regulator assembly includes a first stationary exhaust pipe, a second stationary exhaust pipe concentrically disposed within the first stationary exhaust pipe, and a movable exhaust pipe concentrically disposed between the first and second stationary exhaust pipes. The first stationary exhaust pipe includes one or more interference tabs concentrically and circumferentially fitted about its interior surface. The movable exhaust pipe includes one or more interference tabs concentrically and circumferentially fitted about its exterior surface. The interference tabs complimentarily interact and restrict the movement of the variable flow regulator so that the flow maldistribution of the exhaust gas stream entering the catalytic converter can be variably controlled.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: August 22, 2006
    Assignee: Delphi Technologies, Inc.
    Inventors: Paul E. Jankowski, Stephen J. Myers
  • Patent number: 7080505
    Abstract: A vehicular atmosphere cleansing system utilizes a regenerative wheel having flow channels extending through the wheel coated with an adsorbant. An atmosphere stream passes through a first position dependent portion of the wheel where VOC's including HC's are adsorbed while a heated atmosphere stream passes through a second position dependent regenerative portion of the wheel whereat VOC's are desorbed. The adsorbant is activated carbon having particles of micropore size adhered to the substrate by a silicone binder producing high adsorption efficiencies while withstanding relatively high regenerative heat temperatures resulting from exhaust gas sensible heat. A hydrocarbon senses HC in the desorbed heated atmosphere stream to rotatively and sequentially index pie shaped, segmented portions of the wheel into the wheel's regenerative region while also functioning as the main component of an OBD device for the system.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: July 25, 2006
    Assignee: Engelhard Corporation
    Inventors: Gerald S. Koermer, Jeffrey B. Hoke, Ronald M. Heck, Terence C. Poles, Edward T. Wolynic
  • Patent number: 7051518
    Abstract: A system to supply hydrogen-rich fuel to an internal combustion engine, whereby a hydrogen-rich gas is produced from a liquid raw fuel by a hydrogen generator. The exhaust line of the internal combustion engine contains an exhaust purification system, such as a DeNOx catalytic converter, which is at least temporarily supplied with hydrogen-rich gas through a bypass line. In addition, the exhaust line is in thermal contact with the hydrogen generator in order to recover thermal energy.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: May 30, 2006
    Assignee: NuCellSys GmbH
    Inventors: Uwe Benz, Guenther Dietrich, Detlef zur Megede
  • Patent number: 7010910
    Abstract: An exhaust gas purification apparatus for purifying exhaust gas exhausted from a diesel internal combustion engine and containing therein harmful substances including particulates, NOx, HC and CO, at least, comprises a removal part for trapping and removing particulates in the exhaust gas, a purification part for purifying NOx, HC and CO through contact, and a heat transfer part for transferring heat generated in the removal part to the purification part.
    Type: Grant
    Filed: November 13, 2003
    Date of Patent: March 14, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Hiroko Watanabe, Osamu Kuroda, Yuichi Kitahara, Norihiro Shinotsuka, Masayuki Kamikawa
  • Patent number: 6968679
    Abstract: A method for operating an internal combustion engine includes the step of measuring emission values of at least two pollutant components of an exhaust gas of an internal combustion engine. A value of at least one operating parameter of the internal combustion engine is changed in order to decrease an emission value of a first pollutant component if the emission value of the first pollutant component exceeds a given maximum threshold value. An emission value of a second pollutant component is monitored in order to determine whether the emission value of the second pollutant component remains below a maximum value for the second pollutant component and whether an increase in the emission value to the maximum value for the second pollutant component is permitted.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: November 29, 2005
    Assignee: Volkswagen AG
    Inventor: Ekkehard Pott
  • Patent number: 6968680
    Abstract: An exhaust valve downstream of a diesel engine splits exhaust gasses between two catalysts. In one position, most of the exhaust gasses go to a first catalyst, and the remaining exhaust gasses, along with injected reductant go to a second catalyst. In a second position, most of the exhaust gasses go to the second catalyst, and the remaining exhaust gasses, along with injected reductant go to the first catalyst. In this way, a reduced cost system is achieved.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: November 29, 2005
    Assignee: Ford Global Technologies, LLC
    Inventors: Michiel J. van Nieuwstadt, Devesh Upadhyay, William Charles Ruona
  • Patent number: 6964161
    Abstract: A induction exhaust system, for an internal combustion engine, capable of the multi step processes of 1) scavenging the chamber of exhaust gases and free radicals, 2) breaking the scavenge vacuum wave behind each energetic exhaust pulse, releasing said free radicals and the overscavenged air fuel vacuumed from the intake manifold during valve overlap, and 3) induction of such free radicals, unburned fuel, and fresh matter including atmospheric air.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: November 15, 2005
    Inventor: Monty Allen Campbell
  • Patent number: 6945034
    Abstract: An exhaust gas purifying apparatus for an internal combustion engine is provided for switching a switching valve at an optimal timing in accordance with an actual activated state of a catalyzer and a heated state of an adsorbent to achieve an optimal exhaust gas characteristic. The exhaust gas purifying apparatus comprises a catalyzer disposed in an exhaust system of the internal combustion engine, an adsorbent filled in a second passage circumventing a first passage in the exhaust system for adsorbing hydrocarbons within exhaust gases, a switching valve operable to switch between an open position for opening the first passage and a close position for closing the first passage, an ECU for detecting an atmospheric pressure state, and a switching valve driver for driving the switching valve to the close position upon start of the internal combustion engine, and driving the switching valve to the open position in accordance with the detected atmospheric pressure state.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: September 20, 2005
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Masaki Ueno, Shiro Takakura, Kei Machida
  • Patent number: 6901750
    Abstract: Exhaust emission control apparatus and method for an internal combustion engine maintain a small amount of sulfur components contained in exhaust gas flowing out of a sulfur component retainer agent even if the amount of sulfur components retained by the agent becomes great. The exhaust emission control apparatus includes a NOx retainer agent and the sulfur component retainer agent. The apparatus performs a NOx releasing process of adjusting the air-fuel ratio of exhaust gas flowing into the sulfur component retainer agent so that the air-fuel ratio of exhaust gas flowing into the NOx retainer agent becomes substantially stoichiometric or rich of stoichiometry if NOx retained by the NOx retainer agent is to be released. The apparatus prohibits the air-fuel ratio of exhaust gas flowing into the sulfur component retainer agent from becoming substantially stoichiometric or rich of stoichiometry if the amount of the sulfur components retained by the agent is at least a first predetermined amount.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: June 7, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shunsuke Toshioka, Shinya Hirota, Yoshimitsu Henda, Kazuhiro Itoh, Takamitsu Asanuma, Koichi Kimura, Yasuaki Nakano, Koichiro Nakatani, Akira Mikami, Takanori Ueda
  • Patent number: 6889498
    Abstract: A cost-effective solution to removing particulates from diesel, especially light-duty diesel engines incorporates an oxidation catalyst (2) effective to convert NO in the exhaust from the engine to NO2 and a particulate trap (4) which traps no more than 85% by weight of the particulate, optionally by permitting gas to by-pass the trap.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: May 10, 2005
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Guy Richard Chandler, Martyn Vincent Twigg
  • Patent number: 6883306
    Abstract: An emission treatment system for a vehicle is provided that includes a plasma reactor is disposed in a main exhaust pipe and configured to reduce noxious emissions of an engine. A bypass pipe is connected to the main exhaust pipe both before and after the plasma reactor such that exhaust emissions can be caused to bypass the plasma reactor. A control valve is disposed at a position where the main exhaust pipe and the bypass pipe intersect, and is configured to selectively open and close the main exhaust pipe and the bypass pipe. A power supply unit supplies power to the plasma reactor and the control unit is coupled to the power supply unit and the control valve controlling a voltage of power supplied to the plasma reactor and an operation of the control valve.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: April 26, 2005
    Assignee: Hyundai Motor Company
    Inventors: Yone-Seung Kim, Hyung-Jei Cho, Chi-Young Jeong, Eun-Ki Hong
  • Patent number: 6883311
    Abstract: An apparatus, a system, and a method for treating exhaust gases from an internal combustion engine. The system and method employing the use of a catalytic device coaxial-arranged dual leg apparatus comprising a housing having a first flow path and a second flow path having coaxially arranged portions, a device for selectively directing the exhaust gases between the first flow path and the second flow path, and a first NOx adsorbing catalyst contained in the first flow path.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: April 26, 2005
    Assignee: Detroit Diesel Corporation
    Inventor: Yi Liu
  • Patent number: 6883310
    Abstract: An internal combustion engine emission control apparatus includes split passages that divide exhaust gas discharged from an internal combustion engine into a plurality of streams. Emission control catalysts are provided that individually divide the exhaust gas in the split passages, and remove a component present in the exhaust gas at a high removal rate if a temperature of exhaust gas that inflows via the split passages satisfies a predetermined temperature condition. A controller changes proportions of the amounts of flow of the exhaust gas into the split passages so that the predetermined temperature condition is satisfied in at least one split passage of the split passages. Therefore, the emission control can be performed in a broad range of changing temperatures of the exhaust gas.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: April 26, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Koichiro Nakatani, Toshiaki Tanaka, Shinya Hirota, Takamitsu Asanuma, Koichi Kimura, Shunsuke Toshioka, Akira Mikami