Patents by Inventor Hyun Joon Lee

Hyun Joon Lee 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).

  • Publication number: 20170059538
    Abstract: Disclosed are a chemochromic nanoparticle, a method for manufacturing the chemochromic nanoparticle, and a hydrogen sensor comprising the chemochromic nanoparticle. In particular, the chemochromic nanoparticle has a core-shell structure such that the chemochromic nanoparticle and comprises a core comprising a hydrated or non-hydrated transition metal oxide; and a shell comprising a transition metal catalyst.
    Type: Application
    Filed: April 26, 2016
    Publication date: March 2, 2017
    Inventors: Yong Gyu Noh, Hyun Joon Lee, Hyo Sub Shim, Hyung Tak Seo, Yeong An Lee, Shankara S. Kalanur
  • Patent number: 9543601
    Abstract: A fuel cell system having a hydrogen supply manifold is provided and includes a stack that uses supplied air and fuel gas to generate electricity. A recirculation line recirculates a fuel gas, to an inlet of the stack. An ejector unit is disposed on the recirculation line, supplies fresh fuel gas, and circulates the recirculated gas. The ejector unit includes a middle pressure manifold in which a nozzle mounting portion is formed and a supply passage to transmit fuel gas to the nozzle mounting portion. A control valve is disposed on the middle pressure manifold to adjust fuel supplied to the stack. A nozzle is engaged with an end portion of the nozzle mounting portion to inject fuel gas supplied through the supply passage. Additionally, a low pressure manifold is engaged with the middle pressure manifold to suction and mix exhaust gas of the stack.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: January 10, 2017
    Assignee: Hyundai Motor Company
    Inventors: Sekwon Jung, Bu Kil Kwon, Hyun Joon Lee, Yong Gyu Noh
  • Patent number: 9515332
    Abstract: The present invention relates to a fuel cell system for vehicles and a method for controlling the same which stably maintains an output of a fuel cell by precisely estimating a recirculated hydrogen amount to a stack. A fuel cell system according to the present invention may include: a stack comprising a plurality of unit cells for generating electrical energy by electrochemical reaction of a fuel and an oxidizing agent; a blower for recirculating a gas exhausted from the stack so as to supply the gas back to the stack; an ejector for recirculating the gas exhausted from the stack, receiving hydrogen so as to mix the hydrogen to the recirculated gas, and supplying the mixture to the stack; a sensor module for detecting a driving condition of the vehicle; and a control portion for controlling operations of the blower and the ejector by using the driving condition of the vehicle and performance maps of the blower and the ejector.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: December 6, 2016
    Assignee: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Publication number: 20160189353
    Abstract: Method and apparatuses for correcting vignetting effects of an image are disclosed. A method for vignetting correction of an image according to an exemplary embodiment of the present disclosure may comprise receiving a two-dimensional image; calculating a radial bright channel representing intensity of the two-dimensional image; estimating a vignetting function of the two-dimensional image having similarity to the calculated radial bright channel; and correcting the vignetting effects of the two-dimensional image by using the estimated vignetting function. The vignetting correction methods and apparatuses according to the present disclosure can rapidly correct vignetting effects of an image by using a smaller memory, and correct vignetting effects of an arbitrary single image without being affected by a camera setting and camera lenses used for the image.
    Type: Application
    Filed: December 23, 2015
    Publication date: June 30, 2016
    Inventors: Seung Yong Lee, Ho Jin Cho, Hyun Joon Lee
  • Publication number: 20160126569
    Abstract: A manifold device of a fuel cell stack is provided which prevents moisture condensed in gases supplied to the fuel cell stack from excessively flowing into specific cells of the stack by heating gases supplied into the stack using heat of the stack. The manifold device also prevents flooding that is caused by liquid generated in cells disposed away from a gas inlet by removing a flow rate difference of gases generated in respective cells based on distances from the gas inlet of the stack.
    Type: Application
    Filed: August 31, 2015
    Publication date: May 5, 2016
    Inventors: Bu Kil Kwon, Yong Gyu Noh, Hyun Joon Lee, Young Mo Goo, Seung Eul Yoo
  • Publication number: 20160118675
    Abstract: A fuel cell system having a hydrogen supply manifold according to an exemplary embodiment of the present invention may include a stack that uses air and fuel gas, which is supplied, to generated electricity, a recirculation line that recirculates a fuel gas, which is partially used by the stack to be exhausted, to an inlet of the stack, and an ejector unit that is disposed on the recirculation line, supplies fresh fuel gas, and circulates the recirculated gas, wherein the ejector unit may include a middle pressure manifold where a nozzle mounting portion is formed at one side and a supply passage is formed to transmit fuel gas to the nozzle mounting portion, a control valve that is disposed on the middle pressure manifold to control fuel that is supplied to the stack, a nozzle that is engaged with an end portion of the nozzle mounting portion to injects fuel gas that is supplied through the supply passage, and a low pressure manifold that is engaged with the middle pressure manifold, a chamber is formed to ho
    Type: Application
    Filed: May 20, 2015
    Publication date: April 28, 2016
    Inventors: Sekwon Jung, Bu Kil Kwon, Hyun Joon Lee, Yong Gyu Noh
  • Publication number: 20160116553
    Abstract: Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.
    Type: Application
    Filed: December 17, 2014
    Publication date: April 28, 2016
    Inventors: Kiwoong Kim, Hyun-joon Lee, Jeong-Hyun Shim
  • Publication number: 20160033351
    Abstract: A system and method are provided for correcting an offset of a pressure sensor. The system includes a pressure sensor that is configured to detect pressure of the system and a power management module that is configured to automatically supply power to an apparatus connected to the power management module or terminate the supply of power after a preset time to thereby turn the apparatus on or off. The system further includes a controller connected to the power management module and configured to determine the offset of the pressure sensor based on a pressure value of the system which is detected by the pressure sensor when the power is supplied from the power management module. The system also includes a memory configured to store the determined offset.
    Type: Application
    Filed: December 8, 2014
    Publication date: February 4, 2016
    Inventors: Hyeon Seok Ban, Ho June Bae, Hyun Joon Lee
  • Patent number: 9214684
    Abstract: The present invention provides a fuel control system and method, e.g., for a vehicle fuel cell system, which can efficiently supply hydrogen to a fuel cell stack and increase the efficiency of an ejector. For this purpose, the present invention provides a fuel control system having a series-connected multi-stage pressure control structure, in which an additional injector is provided in series between an injector for controlling the pressure of hydrogen supplied, a pressure control valve, or a pressure control actuator and a hydrogen recirculation ejector in a hydrogen supply passage, through which hydrogen is supplied from a hydrogen supply unit to a fuel cell stack, such that the pressure of hydrogen supplied is controlled in stages.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: December 15, 2015
    Assignee: Hyundai Motor Company
    Inventors: Bu Kil Kwon, Hyun Joon Lee, Ho June Bae
  • Publication number: 20150333341
    Abstract: A fuel cell is provided which comprises a plurality of manifolds at a first end and a second end of the fuel cell and a separator having passages between the first and the second ends of the fuel cell. In particular, the fuel cell includes a nozzle disposed between at least one of the plurality of manifolds and the passages and having an inlet into which a material is introduced from the at least one of the plurality of manifolds and an outlet from which the introduced material is discharged to the passages.
    Type: Application
    Filed: November 23, 2014
    Publication date: November 19, 2015
    Inventors: Hyeon Seok Ban, Yong Gyu Noh, Hyun Joon Lee
  • Publication number: 20150267836
    Abstract: A solenoid valve for a fuel cell system is provided that includes a valve housing and a valve body disposed within the valve housing having an inflow passage through which hydrogen flows in, a discharge passage through which hydrogen is discharged, and a valve passage connecting the inflow passage and the discharge passage. A solenoid is disposed within the valve housing and a plunger is supported within the solenoid by a valve spring. and the plunger is movable upward and downward while corresponding to the direction of the valve passage. A pressure balance unit is disposed extraneous to the plunger to press the plunger with force corresponding to excessive pressure greater than a determined inflow hydrogen pressure applied through a branch passage that branches off from the inflow passage.
    Type: Application
    Filed: November 7, 2014
    Publication date: September 24, 2015
    Inventors: Hyun Joon Lee, Bu Kil Kwon
  • Publication number: 20150180065
    Abstract: A fuel cell system having a hydrogen purge unit may include a purge pipe that connects an air discharge pipe connecting a fuel cell stack and a humidifying device and a hydrogen discharge pipe that discharges hydrogen from the fuel cell stack, and a purge valve provided at the purge pipe. In particular, a plurality of purge branch apertures are structured to discharge a purge gas from the fuel cell stack into the air discharge pipe by providing the purge branch apertures at intervals along the bottom surface of the purge pipe in a downstream section of the purge pipe that extends from the purge valve in a downstream direction.
    Type: Application
    Filed: September 30, 2014
    Publication date: June 25, 2015
    Inventors: Bu Kil Kwon, Chi Myung Kim, Hyun Joon Lee
  • Patent number: 8997771
    Abstract: An integrated pressure control actuator assembly of a hydrogen supply system includes: a start/stop solenoid valve, a bypass valve, and a pressure control actuator, which are integrally formed in a single body; a normal flow path formed on the body, through which hydrogen gas is transferred from the start/stop solenoid valve to the pressure control actuator; an auxiliary flow path formed on the body, through which hydrogen gas is transferred according to opening and closing of the bypass valve connected to the normal flow path; and a control means for controlling the opening and closing of the bypass valve by detecting a failure of the pressure control actuator. The assembly enables the fuel cell vehicle to be driven in a limp home mode in the event of an emergency by adjustment of the pressure of hydrogen.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: April 7, 2015
    Assignee: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh
  • Publication number: 20140205920
    Abstract: The present invention relates to a fuel cell system for vehicles and a method for controlling the same which stably maintains an output of a fuel cell by precisely estimating a recirculated hydrogen amount to a stack. A fuel cell system according to the present invention may include: a stack comprising a plurality of unit cells for generating electrical energy by electrochemical reaction of a fuel and an oxidizing agent; a blower for recirculating a gas exhausted from the stack so as to supply the gas back to the stack; an ejector for recirculating the gas exhausted from the stack, receiving hydrogen so as to mix the hydrogen to the recirculated gas, and supplying the mixture to the stack; a sensor module for detecting a driving condition of the vehicle; and a control portion for controlling operations of the blower and the ejector by using the driving condition of the vehicle and performance maps of the blower and the ejector.
    Type: Application
    Filed: March 25, 2014
    Publication date: July 24, 2014
    Applicant: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Publication number: 20140166121
    Abstract: A hydrogen supply apparatus of the fuel cell system includes a hydrogen tank and a pressure discharge line. The hydrogen tank is configured to store high-pressure hydrogen. A hydrogen supply line connected with a stack is disposed in the hydrogen tank. A pressure control valve configured to control hydrogen pressure of an anode of the stack is disposed in the hydrogen supply line. The pressure discharge line has a pressure relief valve and is disposed at the anode of the stack and a path connected thereto. The pressure discharge line is connected to an air supply line of the stack.
    Type: Application
    Filed: December 5, 2013
    Publication date: June 19, 2014
    Applicant: Hyundai Motor Company
    Inventors: Sekwon JUNG, Hyeonseok BAN, Hyun Joon LEE, Bu Kil KWON, Yong Gyu NOH
  • Patent number: 8709669
    Abstract: The present invention relates to a fuel cell system for vehicles and a method for controlling the same which stably maintains an output of a fuel cell by precisely estimating a recirculated hydrogen amount to a stack. A fuel cell system according to the present invention may include: a stack comprising a plurality of unit cells for generating electrical energy by electrochemical reaction of a fuel and an oxidizing agent; a blower for recirculating a gas exhausted from the stack so as to supply the gas back to the stack; an ejector for recirculating the gas exhausted from the stack, receiving hydrogen so as to mix the hydrogen to the recirculated gas, and supplying the mixture to the stack; a sensor module for detecting a driving condition of the vehicle; and a control portion for controlling operations of the blower and the ejector by using the driving condition of the vehicle and performance maps of the blower and the ejector.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: April 29, 2014
    Assignee: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Patent number: 8580444
    Abstract: The present invention provides a hydrogen discharge system for a fuel cell system, which can ensure safety of a fuel cell vehicle by optimizing the dilution of hydrogen discharged from a fuel cell during discharge and ensure silence of the vehicle by reducing noise generated during discharge. For this purpose, the present invention provides a hydrogen discharge system for a fuel cell system including a purge valve for purging hydrogen discharged from a fuel electrode of a fuel cell stack, the hydrogen discharge system including: an ejector mounted to a hydrogen purge line extending from the purge valve to introduce air from the outside; and a post-treatment system connected to an exhaust line of the ejector to remove hydrogen discharged therethrough.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: November 12, 2013
    Assignee: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Publication number: 20130295482
    Abstract: Disclosed is a hydrogen supply system for a fuel cell, which has an integrated manifold block in which components for hydrogen supply are integrated and modulated. In particular, a hydrogen supply line, a hydrogen discharge line, and a hydrogen recirculation line are formed in a manifold block mounted on the outside of a plurality of stack modules of a fuel cell stack. Additionally, components of the hydrogen supply system including components for supplying and discharging hydrogen and components for recirculating hydrogen are integrally mounted in predetermined positions of the hydrogen supply line, the hydrogen discharge line, and the hydrogen recirculation line to modularize the manifold block and the components of the hydrogen supply system.
    Type: Application
    Filed: October 16, 2012
    Publication date: November 7, 2013
    Applicants: KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY
    Inventors: Duck Whan Kim, Sae Hoon Kim, Young Bum Kum, Yong Gyu Noh, Se Kwon Jung, Hyun Joon Lee
  • Patent number: 8481218
    Abstract: The present invention provides a hydrogen exhaust system for a fuel cell vehicle, which is configured to actively control an exhaust path of hydrogen discharged from an anode of a fuel cell stack to maximize the safety of the vehicle by minimizing the possibility of explosion due to hydrogen exhaust and ensure the silence of the vehicle by minimizing noise generated during hydrogen exhaust. Moreover, the present invention provides a hydrogen exhaust system for a fuel cell vehicle, which can improve the performance and power of the fuel cell stack by supplying water discharged from the fuel cell stack to an air supply line of the fuel cell stack together with purge hydrogen discharged to a hydrogen exhaust line to increase the humidification performance of the fuel cell stack.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: July 9, 2013
    Assignee: Hyundai Motor Company
    Inventors: Bu Kil Kwon, Hyun Joon Lee, Hyo Sub Shim, Se Kwon Jung, Yong Sun Park
  • Patent number: 8323840
    Abstract: Disclosed is a hydrogen recirculation apparatus for a fuel cell vehicle. More specifically, the apparatus described herein includes a humidifier/heat exchanger humidifies and heat-exchanges dry hydrogen flowing through a low-pressure regulator and recirculated hydrogen flowing through a hydrogen recirculation blower. The humidifier/heat exchanger utilizes the condensed water flowing from a water separator as a source of humidity. The water heat-exchanged with hydrogen by the humidifier/heat exchanger is reused for cooling the hydrogen recirculation blower, and the water used in the hydrogen recirculation blower. The temperature increased by the operation of the hydrogen recirculation blower, is mixed with water flowing from the water separator before introduction into humidifier/heat exchanger.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: December 4, 2012
    Assignee: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh