Patents by Inventor Charlie Kim
Charlie Kim 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: 11933244Abstract: Systems and methods regarding a ducted fuel injection (DFI) combustion system for an internal combustion engine can control an injection timing of a fuel injector to output fuel injections through at least one duct and into a combustion chamber of the internal combustion engine. The injection timing can include one or more pilot injections according to a predetermined range before top dead center (BTDC) for a combustion cycle; and a main injection into the combustion chamber for the combustion cycle after all of the one or more pilot injections. A first amount of the fuel injected for the main injection can be greater than a second amount of fuel injected for the one or more pilot injections. The predetermined range before top dead center (BTDC) of the one or more pilot injections can be from 85 to 40 degrees BTDC.Type: GrantFiled: September 1, 2021Date of Patent: March 19, 2024Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20230061758Abstract: Systems and methods regarding a ducted fuel injection (DFI) combustion system for an internal combustion engine can control an injection timing of a fuel injector to output fuel injections through at least one duct and into a combustion chamber of the internal combustion engine. The injection timing can include one or more pilot injections according to a predetermined range before top dead center (BTDC) for a combustion cycle; and a main injection into the combustion chamber for the combustion cycle after all of the one or more pilot injections. A first amount of the fuel injected for the main injection can be greater than a second amount of fuel injected for the one or more pilot injections. The predetermined range before top dead center (BTDC) of the one or more pilot injections can be from 85 to 40 degrees BTDC.Type: ApplicationFiled: September 1, 2021Publication date: March 2, 2023Applicant: Caterpillar Inc.Inventor: Charlie KIM
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Patent number: 10202959Abstract: A method for operating an internal combustion engine includes operating at least one cylinder pre-chamber in a homogeneous charge compression ignition (HCCI) combustion mode by providing an air/fuel mixture in the pre-chamber that is fluidly connected to the at least one engine cylinder, creating H and OH radicals in the pre-chamber to achieve an ignition in the at least one pre-chamber, determining whether an ignition timing is advanced or delayed relative to a desired timing, and delaying the ignition when the ignition is advanced relative to the desired timing by cooling the pre-chamber and the at least one engine cylinder.Type: GrantFiled: April 26, 2016Date of Patent: February 12, 2019Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Patent number: 9995202Abstract: A sparkplug assembly having a prechamber volume is operatively associated with the combustion chamber of an internal combustion engine such that the prechamber volume is in fluid communication with the combustion chamber. To purge exhaust gasses from the prechamber volume prior to ignition, the sparkplug assembly is operatively associated with a high-pressure air/fuel source that directs a pressurized air/fuel purge charge to the prechamber volume. The pressurized air/fuel purge charge may be at stoichiometric conditions. The high-pressure air/fuel source is configured to direct the pressurized air/fuel purge charge during at least a portion of the compression stroke to maintain a largely stoichiometric mixture of air and fuel in the prechamber volume.Type: GrantFiled: August 5, 2016Date of Patent: June 12, 2018Assignee: Caterpillar Inc.Inventors: Martin Willi, Charlie Kim
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Publication number: 20180038269Abstract: A sparkplug assembly having a prechamber volume is operatively associated with the combustion chamber of an internal combustion engine such that the prechamber volume is in fluid communication with the combustion chamber. To purge exhaust gasses from the prechamber volume prior to ignition, the sparkplug assembly is operatively associated with a high-pressure air/fuel source that directs a pressurized air/fuel purge charge to the prechamber volume. The pressurized air/fuel purge charge may be at stoichiometric conditions. The high-pressure air/fuel source is configured to direct the pressurized air/fuel purge charge during at least a portion of the compression stroke to maintain a largely stoichiometric mixture of air and fuel in the prechamber volume.Type: ApplicationFiled: August 5, 2016Publication date: February 8, 2018Applicant: Caterpillar Inc.Inventors: Martin Willi, Charlie Kim
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Patent number: 9828905Abstract: An engine includes a main combustion chamber; an intake duct configured to provide a lean fuel-oxidizer mixture to the main combustion chamber; a pre-chamber in fluid communication with the main combustion chamber, the pre-chamber including an ignition energy source operatively coupled to the pre-chamber, and a heating element in thermal communication with the pre-chamber; and a controller operatively coupled to the ignition energy source and the heating element. The controller is configured to initiate combustion of the lean fuel-oxidizer mixture in the main combustion chamber by activating the ignition energy source, and heat fuel and oxidizer in the pre-chamber via the heating element to a temperature sufficient to produce hydrogen peroxide (H2O2) in the pre-chamber.Type: GrantFiled: July 15, 2015Date of Patent: November 28, 2017Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20170306917Abstract: A method for operating an internal combustion engine includes operating at least one cylinder pre-chamber in a homogeneous charge compression ignition (HCCI) combustion mode by providing an air/fuel mixture in the pre-chamber that is fluidly connected to the at least one engine cylinder, creating H and OH radicals in the pre-chamber to achieve an ignition in the at least one pre-chamber, determining whether an ignition timing is advanced or delayed relative to a desired timing, and delaying the ignition when the ignition is advanced relative to the desired timing by cooling the pre-chamber and the at least one engine cylinder.Type: ApplicationFiled: April 26, 2016Publication date: October 26, 2017Applicant: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20170074184Abstract: An internal combustion engine includes a pre-chamber assembly including a wall having an internal surface opposite an external surface, the internal surface of the wall defining a combustion pre-chamber and at least one orifice extending to an aperture through the external surface of the wall; a block having an internal surface defining a bore therein; a piston disposed within the bore and configured for reciprocal translation within the bore, the piston, the bore, and the external surface of the wall at least partly defining a main combustion chamber, and the combustion pre-chamber being in fluid communication with the main combustion chamber via the at least one orifice; an energy source operatively coupled to the combustion pre-chamber; and an exhaust gas recirculation (EGR) valve fluidly coupled to the combustion pre-chamber and an exhaust conduit of the internal combustion engine.Type: ApplicationFiled: September 16, 2015Publication date: March 16, 2017Applicant: Caterpillar Inc.Inventor: Charlie Kim
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Patent number: 9593622Abstract: A nozzle for a prechamber assembly of an engine includes a hollow nozzle body having an outer surface, defining first and second outer openings, and an inner surface, defining an interior chamber and first and second inner openings. The nozzle body defines first and second orifices in communication with the interior chamber. The first orifice extends in a first orifice configuration between the first outer opening and inner opening and defines a first entry path projection extending from the first inner opening into the interior chamber. The second orifice extends in a second orifice configuration between the second outer opening and inner opening and defines a second entry path projection extending from the second inner opening into the interior chamber. The first and second entry path projections intersect at an impingement region in the interior chamber, which is radially offset from a central longitudinal axis of the nozzle.Type: GrantFiled: February 9, 2015Date of Patent: March 14, 2017Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Patent number: 9593633Abstract: An internal combustion engine includes a pre-chamber assembly including a wall having an internal surface opposite an external surface, the internal surface of the wall defining a combustion pre-chamber and at least one orifice extending to an aperture through the external surface of the wall; a block having an internal surface defining a bore therein; a piston disposed within the bore and configured for reciprocal translation within the bore, the piston, the bore, and the external surface of the wall at least partly defining a main combustion chamber, and the combustion pre-chamber being in fluid communication with the main combustion chamber via the at least one orifice; an energy source operatively coupled to the combustion pre-chamber; and an exhaust gas recirculation (EGR) valve fluidly coupled to the combustion pre-chamber and an exhaust conduit of the internal combustion engine.Type: GrantFiled: September 16, 2015Date of Patent: March 14, 2017Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20160348569Abstract: An internal combustion engine includes a pre-chamber assembly including a wall having an internal surface opposite an external surface, the internal surface of the wall defining a combustion pre-chamber and at least one orifice extending to an aperture through the external surface of the wall; a block having an internal surface defining a bore therein; a piston disposed within the bore and configured for reciprocal translation within the bore, the piston, the bore, and the external surface of the wall at least partly defining a main combustion chamber, and the combustion pre-chamber being in fluid communication with the main combustion chamber via the at least one orifice; an energy source operatively coupled to the combustion pre-chamber; and a controller operatively coupled to the energy source.Type: ApplicationFiled: May 28, 2015Publication date: December 1, 2016Applicant: Caterpillar Inc.Inventor: Charlie Kim
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Patent number: 9482192Abstract: A lean-burn engine may comprise a combustion chamber, an intake manifold configured to provide a lean fuel/air mixture to the combustion chamber, and a pre-chamber in fluid communication with the combustion chamber. The pre-chamber may include a spark igniter configured to initiate combustion of the lean fuel/air mixture in the combustion chamber, and a heating element contained in the pre-chamber. The heating element may be configured to heat the pre-chamber to a temperature sufficient to allow the production of hydrogen peroxide (H2O2) from fuel and air in the pre-chamber.Type: GrantFiled: January 2, 2015Date of Patent: November 1, 2016Assignee: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20160230646Abstract: A nozzle for a prechamber assembly of an engine includes a hollow nozzle body having an outer surface, defining first and second outer openings, and an inner surface, defining an interior chamber and first and second inner openings. The nozzle body defines first and second orifices in communication with the interior chamber. The first orifice extends in a first orifice configuration between the first outer opening and inner opening and defines a first entry path projection extending from the first inner opening into the interior chamber. The second orifice extends in a second orifice configuration between the second outer opening and inner opening and defines a second entry path projection extending from the second inner opening into the interior chamber. The first and second entry path projections intersect at an impingement region in the interior chamber, which is radially offset from a central longitudinal axis of the nozzle.Type: ApplicationFiled: February 9, 2015Publication date: August 11, 2016Applicant: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20160195007Abstract: An engine includes a main combustion chamber; an intake duct configured to provide a lean fuel-oxidizer mixture to the main combustion chamber; a pre-chamber in fluid communication with the main combustion chamber, the pre-chamber including an ignition energy source operatively coupled to the pre-chamber, and a heating element in thermal communication with the pre-chamber; and a controller operatively coupled to the ignition energy source and the heating element. The controller is configured to initiate combustion of the lean fuel-oxidizer mixture in the main combustion chamber by activating the ignition energy source, and heat fuel and oxidizer in the pre-chamber via the heating element to a temperature sufficient to produce hydrogen peroxide (H2O2) in the pre-chamber.Type: ApplicationFiled: July 15, 2015Publication date: July 7, 2016Applicant: Caterpillar Inc.Inventor: Charlie Kim
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Publication number: 20160195041Abstract: A lean-burn engine may comprise a combustion chamber, an intake manifold configured to provide a lean fuel/air mixture to the combustion chamber, and a pre-chamber in fluid communication with the combustion chamber. The pre-chamber may include a spark igniter configured to initiate combustion of the lean fuel/air mixture in the combustion chamber, and a heating element contained in the pre-chamber. The heating element may be configured to heat the pre-chamber to a temperature sufficient to allow the production of hydrogen peroxide (H2O2) from fuel and air in the pre-chamber.Type: ApplicationFiled: January 2, 2015Publication date: July 7, 2016Applicant: CATERPILLAR INC.Inventor: Charlie Kim
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Patent number: 8364772Abstract: An Instant Messaging security system that encrypts Instant Messages sent by a Instant Messaging user to an Instant Messaging server by intercepting the messages, negotiating a preferred security algorithm and forwarding the encrypted messages to the server. The security system intercepts and decrypts encrypted messages sent by the server to the user. The security system is able to determine whether a receiving user is equipped with a similar security system without prior knowledge of network addresses, configuration or capability. The security system is transparent to the Instant Message service provider and may provide one or more indicators to users that messages are encrypted during forwarding.Type: GrantFiled: January 18, 2012Date of Patent: January 29, 2013Assignee: McAfee, Inc.Inventors: Saroop Mathur, Rajamadam C. Venkatraman, Charlie Kim, Ashish Warty, Yih-Ming Liao
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Patent number: 8117273Abstract: An Instant Messaging security system that encrypts Instant Messages sent by a Instant Messaging user to an Instant Messaging server by intercepting the messages, negotiating a preferred security algorithm and forwarding the encrypted messages to the server. The security system intercepts and decrypts encrypted messages sent by the server to the user. The security system is able to determine whether a receiving user is equipped with a similar security system without prior knowledge of network addresses, configuration or capability. The security system is transparent to the Instant Message service provider and may provide one or more indicators to users that messages are encrypted during forwarding.Type: GrantFiled: July 12, 2004Date of Patent: February 14, 2012Assignee: McAfee, Inc.Inventors: Saroop Mathur, Rajamadam C. Venkatraman, Charlie Kim, Ashish Warty, Yih-Ming M. Liao
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Publication number: 20050139175Abstract: A turbo-charged internal combustion cylinder assembly includes a combustion chamber which may be communicably connected to a compressor via an intake port through an intake manifold and aftercooler so the compressor may provide pre-combustion gases to the combustion chamber when the intake valve is open. An exhaust port communicably connects the combustion chamber to an exhaust manifold. An exhaust valve may open to exhaust post-combustion gases to the exhaust manifold while an intake valve is substantially closed, and the exhaust valve may open to admit post-combustion gases to the combustion chamber while the intake valve is substantially open and an exhaust port pressure in the exhaust port is higher than a combustion chamber pressure in the combustion chamber. A fuel injector may admit fuel to the combustion chamber.Type: ApplicationFiled: March 30, 2004Publication date: June 30, 2005Applicant: Mack Trucks, Inc.Inventors: Charlie Kim, Timothy Suder, Steven Trevitz, Jeffrey Zsoldos