Patents by Inventor Jung Hwan Ryu

Jung Hwan Ryu 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: 20170317366
    Abstract: A pinhole determination method for a fuel cell includes steps of: blocking air supply to a fuel cell stack by a controller; measuring a cell voltage value of each of unit fuel cells of the fuel cell stack; and determining whether or not a pinhole is present by comparing the cell voltage value with an average cell voltage value.
    Type: Application
    Filed: August 8, 2016
    Publication date: November 2, 2017
    Inventors: Jung Hwan Ryu, Soon Woo Kwon
  • Publication number: 20170309935
    Abstract: A power distribution method and system for a fuel cell vehicle is provided. The method includes deducing an amount of moisture in a stack of a fuel cell, when a supply amount of air of the stack of the fuel cell is decreased and determining a state of the fuel cell based on the amount of moisture. Additionally, the method includes deducing allowance power of a regenerative braking of a driving motor using maximum power of the regenerative braking of an air compressor and chargeable power of a high voltage battery based on the determined state. The regenerative braking of the driving motor is then adjusted to prevent actual power of the regenerative braking of the driving motor from exceeding the allowance power of the regenerative braking.
    Type: Application
    Filed: August 19, 2016
    Publication date: October 26, 2017
    Inventors: Dong Hun Lee, Jung Hwan Ryu
  • Patent number: 9425474
    Abstract: A method and a system are provided for controlling an air intake of a fuel cell vehicle. The method includes calculating a value for basic air intake of a fuel cell based on a driver requirement and calculating a value of motor current requirement based on the driver requirement. A rate-of-change is calculated of the value of motor current requirement and a value for supplementary air intake is calculated by multiplying the rate-of-change of the value of motor current requirement by a gain value. A value for final air intake is then calculated by adding the value for basic air intake and the value for supplementary air intake. An air blower of an air intake system of the fuel cell is operated with the value for final air intake.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: August 23, 2016
    Assignee: Hyundai Motor Company
    Inventors: Jung Hwan Ryu, Soon Il Jeon, Dong Hun Lee
  • Publication number: 20150340717
    Abstract: A method and a system are provided for controlling an air intake of a fuel cell vehicle. The method includes calculating a value for basic air intake of a fuel cell based on a driver requirement and calculating a value of motor current requirement based on the driver requirement. A rate-of-change is calculated of the value of motor current requirement and a value for supplementary air intake is calculated by multiplying the rate-of-change of the value of motor current requirement by a gain value. A value for final air intake is then calculated by adding the value for basic air intake and the value for supplementary air intake. An air blower of an air intake system of the fuel cell is operated with the value for final air intake.
    Type: Application
    Filed: December 2, 2014
    Publication date: November 26, 2015
    Inventors: Jung Hwan Ryu, Soon Il Jeon, Dong Hun Lee
  • Publication number: 20150318565
    Abstract: A system and method of controlling a fuel cell vehicle are provided. The method includes adjusting power output from a plurality of fuel cell stacks based on entire output power required by a fuel cell vehicle and a state of charge (SOC) of a battery.
    Type: Application
    Filed: November 25, 2014
    Publication date: November 5, 2015
    Inventors: Jung Hwan Ryu, Ja Hoo Koo
  • Patent number: 8859158
    Abstract: The present invention provides a hybrid fuel cell system that is configured to determine if an idle stop condition has been satisfied during a normal operation mode of the hybrid fuel cell system, cut off air supply to a fuel cell to stop power generation of the fuel cell and reduce a voltage which the fuel cell outputs in response to determining that the idle stop condition has been satisfied. The voltage of a bidirectional converter, connected between a battery and a bus terminal is reduced and the output of the fuel cell is controlled, based on a first predetermined value and maintained at that first predetermined value. Subsequently, the battery is charged via the output current of the fuel cell generated by maintaining the reduced voltage of the bidirectional converter.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: October 14, 2014
    Assignee: Hyundai Motor Company
    Inventors: Sang Uk Kwon, Nam Woo Lee, Kyu Il Lee, Soon Il Jeon, Seong Pil Ryu, Jung Hwan Ryu
  • Patent number: 8518593
    Abstract: The present invention provides a method for controlling the operation of a fuel cell system at low temperature that can suitably prevent flooding in a cathode of a fuel cell stack during low-temperature operation, thus improving the operation stability and durability of the fuel cell stack.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: August 27, 2013
    Assignees: Hyundai Motor Company, Industry-University Cooperation Foundation Hanyang University
    Inventors: Dong Hun Lee, Seo Ho Choi, Sun Soon Park, Myoung Ho Sunwoo, Jung Hwan Ryu, Keon Yup Chu, Ki Chun Jo
  • Publication number: 20120141895
    Abstract: The present invention provides a hybrid fuel cell system that is configured to determine if an idle stop condition has been satisfied during a normal operation mode of the hybrid fuel cell system, cut off air supply to a fuel cell to stop power generation of the fuel cell and reduce a voltage which the fuel cell outputs in response to determining that the idle stop condition has been satisfied. The voltage of a bidirectional converter, connected between a battery and a bus terminal is reduced and the output of the fuel cell is controlled, based on a first predetermined value and maintained at that first predetermined value. Subsequently, the battery is charged via the output current of the fuel cell generated by maintaining the reduced voltage of the bidirectional converter.
    Type: Application
    Filed: July 18, 2011
    Publication date: June 7, 2012
    Applicant: HYUNDAI MOTOR COMPANY
    Inventors: Sang Uk Kwon, Nam Woo Lee, Kyu Il Lee, Soon Il Jeon, Seong Pil Ryu, Jung Hwan Ryu
  • Publication number: 20110070515
    Abstract: The present invention provides a method for controlling the operation of a fuel cell system at low temperature that can suitably prevent flooding in a cathode of a fuel cell stack during low-temperature operation, thus improving the operation stability and durability of the fuel cell stack.
    Type: Application
    Filed: June 7, 2010
    Publication date: March 24, 2011
    Applicants: Hyundai Motor Company, Industry-University Cooperation Foundation Hanyang University
    Inventors: Dong Hun Lee, Seo Ho Choi, Sun Soon Park, Myoung Ho Sunwoo, Jung Hwan Ryu, Keon Yup Chu, Ki Chun Jo