Patents by Inventor Keith E. Lawrence
Keith E. Lawrence has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7909271Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: GrantFiled: August 14, 2008Date of Patent: March 22, 2011Assignee: Caterpillar Inc.Inventors: Mark S. Cavanagh, Roger L. Urven, Jr., Keith E. Lawrence
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Publication number: 20080308656Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: ApplicationFiled: August 14, 2008Publication date: December 18, 2008Inventors: Mark S. Cavanagh, Roger L. Urven, JR., Keith E. Lawrence
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Patent number: 7444980Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: GrantFiled: May 22, 2007Date of Patent: November 4, 2008Assignee: Caterpillar Inc.Inventors: Mark S. Cavanagh, Roger L. Urven, Jr., Keith E. Lawrence
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Patent number: 7290520Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: GrantFiled: February 15, 2006Date of Patent: November 6, 2007Assignee: Caterpillar IncInventors: Mark S. Cavanagh, Roger L. Urven, Jr., Keith E. Lawrence
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Patent number: 7134615Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. The homogeneous charged nozzle outlet set is defined by a nozzle insert that is attached to an injector body, which defines the conventional nozzle outlet set. The nozzle insert is a one piece metallic component with a large diameter segment separated from a small diameter segment by an annular engagement surface. One of the needle valve members is guided on an outer surface of the nozzle insert, and the nozzle insert has an interference fit attachment to the injector body.Type: GrantFiled: July 31, 2002Date of Patent: November 14, 2006Assignee: Caterpillar IncInventor: Keith E. Lawrence
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Patent number: 7055469Abstract: An apparatus and method for varying a compression ratio of an engine having a block and a head mounted thereto. The apparatus and method includes a cylinder having a block portion and a head portion, a piston linearly movable in the block portion of the cylinder, a cylinder plug linearly movable in the head portion of the cylinder, and a valve located in the cylinder plug and operable to provide controlled fluid communication with the block portion of the cylinder.Type: GrantFiled: February 18, 2003Date of Patent: June 6, 2006Assignee: Caterpillar IncInventors: Keith E. Lawrence, Bryan E. Strawbridge, Charles H. Dutart
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Patent number: 7032566Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: GrantFiled: May 30, 2003Date of Patent: April 25, 2006Assignee: Caterpillar Inc.Inventors: Mark S. Cavanagh, Roger L. Urven, Jr., Keith E. Lawrence
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Patent number: 6945475Abstract: A fuel injection system has the ability to produce two different spray patterns depending on the positioning of a needle control valve member. Positioning of the needle control valve member determines which of the two needle control chambers are placed in a low pressure condition. First and second needle valve members have closing hydraulic surfaces exposed to fluid pressure in the two needle control chambers. The injector preferably includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by the first and second needle valve members.Type: GrantFiled: December 5, 2002Date of Patent: September 20, 2005Assignee: Caterpillar IncInventors: Keith E. Lawrence, Ye Tian
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Patent number: 6843434Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively by inner and outer needle value members. The homogenous charged nozzle outlet set is defined by an outer needle value member that is moveably positioned in an injector body, which defines the conventional nozzle outlet set. The inner needle valve member is positioned in the outer needle valve member. The outer needle valve member is a piece component that includes at least one external guide surface, an external value surface and an internal valve seat.Type: GrantFiled: February 28, 2003Date of Patent: January 18, 2005Assignee: Caterpillar IncInventors: Keith E. Lawrence, Michael H. Hinrichsen, Colby Buckman
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Publication number: 20040237929Abstract: A direct injection fuel injector includes a nozzle tip having a plurality of passages allowing fluid communication between an inner nozzle tip surface portion and an outer nozzle tip surface portion and directly into a combustion chamber of an internal combustion engine. A first group of the passages have inner surface apertures located substantially in a first common plane. A second group of the passages have inner surface apertures located substantially in at least a second common plane substantially parallel to the first common plane. The second group has more passages than the first group.Type: ApplicationFiled: May 30, 2003Publication date: December 2, 2004Applicant: Caterpillar Inc.Inventors: Mark S. Cavanagh, Roger L. Urven, Keith E. Lawrence
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Publication number: 20040195385Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively by inner and outer needle valve members. The homogenous charged nozzle outlet set is defined by an outer needle valve member that is moveably positioned in an injector body, which defines the conventional nozzle outlet set. The inner needle valve member is positioned in the outer needle valve member. The outer needle valve member is a one piece component that includes at least one external guide surface, an external valve surface and an internal valve seat.Type: ApplicationFiled: February 28, 2003Publication date: October 7, 2004Inventors: Keith E. Lawrence, Michael H. Hinrichsen, Colby Buckman
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Publication number: 20040159292Abstract: An apparatus and method for varying a compression ratio of an engine having a block and a head mounted thereto. The apparatus and method includes a cylinder having a block portion and a head portion, a piston linearly movable in the block portion of the cylinder, a cylinder plug linearly movable in the head portion of the cylinder, and a valve located in the cylinder plug and operable to provide controlled fluid communication with the block portion of the cylinder.Type: ApplicationFiled: February 18, 2003Publication date: August 19, 2004Inventors: Keith E. Lawrence, Bryan E. Strawbridge, Charles H. Dutart
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Patent number: 6769392Abstract: The present invention relates generally to the field of homogenous charge compression ignition engines, in which fuel is injected when the cylinder piston is relatively close to the bottom dead center position for its compression stroke. The fuel mixes with air in the cylinder during the compression stroke to create a relatively lean homogeneous mixture that preferably ignites when the piston is relatively close to the top dead center position. However, if the ignition event occurs either earlier or later than desired, lowered performance, engine misfire, or even engine damage, can result. The present invention utilizes internal exhaust gas recirculation and/or compression ratio control to control the timing of ignition events and combustion duration in homogeneous charge compression ignition engines. Thus, at least one electro-hydraulic assist actuator is provided that is capable of mechanically engaging at least one cam actuated intake and/or exhaust valve.Type: GrantFiled: December 20, 2001Date of Patent: August 3, 2004Assignee: Caterpillar IncInventors: Keith E. Lawrence, James J. Faletti, Steven J. Funke, Ronald P. Maloney
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Publication number: 20040108394Abstract: A fuel injection system has the ability to produce two different spray patterns depending on the positioning of a needle control valve member. Positioning of the needle control valve member determines which of the two needle control chambers are placed in a low pressure condition. First and second needle valve members have closing hydraulic surfaces exposed to fluid pressure in the two needle control chambers. The injector preferably includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by the first and second needle valve members.Type: ApplicationFiled: December 5, 2002Publication date: June 10, 2004Inventors: Keith E. Lawrence, Ye Tian
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Publication number: 20040021013Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. The homogeneous charged nozzle outlet set is defined by a nozzle insert that is attached to an injector body, which defines the conventional nozzle outlet set. The nozzle insert is a one piece metallic component with a large diameter segment separated from a small diameter segment by an annular engagement surface. One of the needle valve members is guided on an outer surface of the nozzle insert, and the nozzle insert has an interference fit attachment to the injector body.Type: ApplicationFiled: July 31, 2002Publication date: February 5, 2004Inventor: Keith E. Lawrence
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Publication number: 20030116124Abstract: The present invention relates generally to the field of homogenous charge compression ignition engines, in which fuel is injected when the cylinder piston is relatively close to the bottom dead center position for its compression stroke. The fuel mixes with air in the cylinder during the compression stroke to create a relatively lean homogeneous mixture that preferably ignites when the piston is relatively close to the top dead center position. However, if the ignition event occurs either earlier or later than desired, lowered performance, engine misfire, or even engine damage, can result. The present invention utilizes internal exhaust gas recirculation and/or compression ratio control to control the timing of ignition events and combustion duration in homogeneous charge compression ignition engines. Thus, at least one electro-hydraulic assist actuator is provided that is capable of mechanically engaging at least one cam actuated intake and/or exhaust valve.Type: ApplicationFiled: December 20, 2001Publication date: June 26, 2003Applicant: Caterpillar, Inc.Inventors: Keith E. Lawrence, James J. Faletti, Steven J. Funke, Ronald P. Maloney
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Patent number: 6427671Abstract: This invention relates generally fluid mixer assembly and more particularly to an exhaust gas recirculation (EGR) mixer comprising an inlet conduit, an exhaust conduit, and a shielded conduit. The shielded conduit is partially disposed in the inlet conduit and has a fluid diverting portion and fluid passing portion. The fluid diverting portion diverts intake air into a first fluid stream and a second fluid stream. Exhaust gas is passed through fluid passing portion and is mixed with the first fluid stream and second fluid stream generally at a point downstream of the shielded conduit.Type: GrantFiled: July 17, 2000Date of Patent: August 6, 2002Assignee: Caterpillar Inc.Inventors: Gordon H. Holze, Keith E. Lawrence, Samuel L. Montooth
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Patent number: 6422217Abstract: An internal combustion engine exhaust gas recirculation (EGR) system includes an exhaust gas manifold back pressure valve insert assembly which has an exhaust gas recirculation (EGR) conduit interposed between exhaust manifold structure of the engine and atmospheric exhaust structure, and a valve mechanism disposed within the exhaust gas recirculation (EGR) conduit and movable between a fully closed position at which all exhaust gases from the engine pass to atmospheric exhaust through the atmospheric exhaust structure, and a fully opened position at which the valve mechanism partially occludes the atmospheric exhaust structure such that a sufficiently large back pressure is developed with respect to the atmospheric exhaust structure such that exhaust gases are forced through the exhaust gas recirculation (EGR) conduit.Type: GrantFiled: December 19, 2000Date of Patent: July 23, 2002Assignee: Caterpillar Inc.Inventors: Dennis D. Feucht, Eric C. Fluga, Keith E. Lawrence, Carol A. Rathman
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Publication number: 20020073978Abstract: An internal combustion engine exhaust gas recirculation (EGR) system includes an exhaust gas manifold back pressure valve insert assembly which has an exhaust gas recirculation (EGR) conduit interposed between exhaust manifold structure of the engine and atmospheric exhaust structure, and a valve mechanism disposed within the exhaust gas recirculation (EGR) conduit and movable between a fully closed position at which all exhaust gases from the engine pass to atmospheric exhaust through the atmospheric exhaust structure, and a fully opened position at which the valve mechanism partially occludes the atmospheric exhaust structure such that a sufficiently large back pressure is developed with respect to the atmospheric exhaust structure such that exhaust gases are forced through the exhaust gas recirculation (EGR) conduit.Type: ApplicationFiled: December 19, 2000Publication date: June 20, 2002Inventors: Dennis D. Feucht, Eric C. Fluga, Keith E. Lawrence, Carol A. Rathman
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Patent number: 6237336Abstract: An internal combustion engine including at least one cylinder head defining a plurality of combustion cylinders. Each combustion cylinder has a displacement volume. An exhaust manifold is fluidly connected to each cylinder for transporting exhaust gas therefrom. An intake manifold provides combustion air to each cylinder. A turbocharger is driven by exhaust gas from the exhaust manifold and provides charged combustion air to the intake manifold. A mixing vessel has at least two inlets, at least one outlet and a mixing chamber. One of the inlets is fluidly connected with the exhaust manifold and an other of the inlets is fluidly connected with the turbocharger. The one inlet and the other inlet are connected with the mixing vessel in a parallel manner. The mixing chamber has a volume which is dependent upon a plurality of the displacement volumes.Type: GrantFiled: November 9, 1999Date of Patent: May 29, 2001Assignee: Caterpillar Inc.Inventors: Dennis D. Feucht, Keith E. Lawrence