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: 20120028146
    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: December 6, 2010
    Publication date: February 2, 2012
    Applicant: HYUNDAI MOTOR COMPANY
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Publication number: 20110048837
    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: Application
    Filed: November 24, 2009
    Publication date: March 3, 2011
    Applicant: HYUNDAI MOTOR COMPANY
    Inventors: Bu Kil Kwon, Hyun Joon Lee, Hyo Sub Shim, Se Kwon Jung, Yong Sun Park
  • Publication number: 20090233133
    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: Application
    Filed: August 19, 2008
    Publication date: September 17, 2009
    Applicant: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh, Bu Kil Kwon
  • Publication number: 20090155668
    Abstract: Multi-stage in-line cartridge ejectors for a fuel cell system provided herein comprise: at least one ejector main body for supplying hydrogen, each ejector main body including a plurality of nozzles arranged in line with a predetermined gap, in which the diameters of the respective nozzles become larger from an inlet side of the ejector main body toward an outlet side thereof, and a plurality of sub-inlets formed on an outer surface of the ejector main body to be connected to the gap or gaps between the nozzles; and a housing accommodating the eject main body and including a main inlet for intake of recirculated hydrogen. The multi-stage in-line cartridge ejectors can improve the system performance by increasing the amount of recirculated hydrogen. Moreover, at least one check valve is provided at an intake position of the cartridge ejectors to effectively prevent reverse flow of recirculation hydrogen gas and at least one heater is provided around the cartridge ejectors to improve cold startability.
    Type: Application
    Filed: May 29, 2008
    Publication date: June 18, 2009
    Applicant: Hyundai Motor Company
    Inventors: Hyeon Seok Ban, Hyun Joon Lee, Yong Gyu Noh, Yong Sun Park
  • Publication number: 20090032756
    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: Application
    Filed: September 19, 2008
    Publication date: February 5, 2009
    Applicant: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh
  • Publication number: 20080318093
    Abstract: The present invention provides a hydrogen recirculation apparatus for a fuel cell vehicle, a fuel tank storing hydrogen, a high-pressure regulator for regulating pressure of hydrogen, a low-pressure regulator for regulating pressure of hydrogen, and a solenoid valve for opening/closing a passage from the fuel tank to the pressure regulators are provided, the apparatus comprising: a fuel cell stack having an inlet and an outlet; a hydrogen recirculation blower; a hydrogen recirculation line connecting the outlet of the fuel cell stack and the hydrogen recirculation blower for recirculating residual hydrogen discharged from the outlet of the fuel cell; a water separator provided in the hydrogen recirculation line at a position between the hydrogen recirculation blower and the outlet of the fuel cell stack, the water separator serving to separate condensed water generated in the hydrogen recirculation line; and a humidifier/heat exchanger for humidifying and heat-exchanging dry hydrogen flowing through the low-p
    Type: Application
    Filed: November 16, 2007
    Publication date: December 25, 2008
    Applicant: Hyundai Motor Company
    Inventors: Hyun Joon Lee, Yong Gyu Noh