Patents by Inventor Yei Sik Jeon

Yei Sik Jeon 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).

  • Patent number: 11088375
    Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: August 10, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Hyun Jae Lee, Jong Hyun Lee, Deuk Kuen Ahn, Yei Sik Jeon
  • Patent number: 10971743
    Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: April 6, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Ik Jae Son, Yei Sik Jeon
  • Patent number: 10944118
    Abstract: A fuel cell system includes a fuel cell stack having a cathode and an anode, a humidifier configured to humidify air that is to be supplied to the cathode, an air supply unit configured to supply the air to the humidifier, and a controller. The controller is configured to adjust a flow rate of the air supplied from the air supply unit, based on a supply of the humidifier, to prevent flooding of the fuel cell stack.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: March 9, 2021
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Hyun Jae Lee, Yei Sik Jeon
  • Publication number: 20200185734
    Abstract: A voltage control method for a fuel cell stack is provided. The method includes determining whether a performance of the fuel cell stack is degraded based on a reference performance that corresponds to the performance of the fuel cell stack evaluated at a reference time point and an evaluated performance that corresponds to the performance of the fuel cell stack evaluated at a predetermined time point after the reference time point. Additionally, the method includes setting a reference voltage, which is set as a maximum allowable voltage for adjusting a voltage of the fuel cell stack, to be less than an existing reference voltage in response to determining that the performance of the fuel cell stack is degraded.
    Type: Application
    Filed: March 12, 2019
    Publication date: June 11, 2020
    Inventor: Yei Sik Jeon
  • Publication number: 20200171976
    Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.
    Type: Application
    Filed: February 27, 2019
    Publication date: June 4, 2020
    Inventors: Hyun Jae Lee, Yei Sik Jeon
  • Publication number: 20200119376
    Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.
    Type: Application
    Filed: December 12, 2019
    Publication date: April 16, 2020
    Inventors: Hyun Jae Lee, Jong Hyun Lee, Deuk Kuen Ahn, Yei Sik Jeon
  • Patent number: 10541436
    Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: January 21, 2020
    Assignee: Hyundai Motor Company
    Inventors: Hyun Jae Lee, Jong Hyun Lee, Deuk Kuen Ahn, Yei Sik Jeon
  • Publication number: 20190363379
    Abstract: An air supply control method of a fuel cell is provided. The method includes adjusting an opening of a pressure control valve in accordance with an opening map stored in advance. The pressure control valve is disposed at an outlet of a fuel cell of an air supply line for supplying air to the fuel cell and discharging air and adjusts air pressure in the air supply line. The method further includes determining whether an air pressure state of the air supply line is normal after adjusting the opening of the pressure control valve and operating the pressure control valve at a predetermined opening in response determining that the air pressure state of the air supply line is abnormal.
    Type: Application
    Filed: October 28, 2018
    Publication date: November 28, 2019
    Inventors: Ik Jae Son, Yei Sik Jeon
  • Patent number: 10476091
    Abstract: A fuel cell purging control method for controlling hydrogen purge of a fuel cell including a stack having an anode and a cathode, an air supply device having an air supply line supplying air to the cathode of the stack, a back pressure adjusting valve adjusting back pressure of the air supply device, and a hydrogen supply device supplying hydrogen to the anode of the stack, includes steps of: determining hydrogen purge of the fuel cell while the fuel cell is being normally operated, reducing back pressure of the air supply line of the fuel cell when the hydrogen purge is determined, and purging hydrogen in the anode of the fuel cell for a preset period of time after the step of reducing the back pressure.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: November 12, 2019
    Assignee: Hyundai Motor Company
    Inventors: Hyun Jae Lee, Dae Jong Kim, Yei Sik Jeon
  • Publication number: 20190140292
    Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.
    Type: Application
    Filed: December 28, 2018
    Publication date: May 9, 2019
    Inventors: Ik Jae Son, Yei Sik Jeon
  • Patent number: 10205184
    Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: February 12, 2019
    Assignee: Hyundai Motor Company
    Inventors: Ik Jae Son, Yei Sik Jeon
  • Patent number: 10062916
    Abstract: A control method and system of a fuel cell system is provided. The control method includes detecting, by a controller, a voltage of a fuel cell stack when power generation of a fuel cell is stopped while a fuel cell vehicle is being driven. In addition, hydrogen supply pressure at an anode side is adjusted based on a variation in the detected voltage.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: August 28, 2018
    Assignee: Hyundai Motor Company
    Inventors: Sang Uk Kwon, Heon Joong Lee, Yei Sik Jeon, Sung Gone Yoon, Ik Jae Son
  • Publication number: 20180175421
    Abstract: A fuel cell system includes a fuel cell stack having a cathode and an anode, a humidifier configured to humidify air that is to be supplied to the cathode, an air supply unit configured to supply the air to the humidifier, and a controller. The controller is configured to adjust a flow rate of the air supplied from the air supply unit, based on a supply of the humidifier, to prevent flooding of the fuel cell stack.
    Type: Application
    Filed: November 21, 2017
    Publication date: June 21, 2018
    Inventors: Hyun Jae LEE, Yei Sik JEON
  • Patent number: 9966616
    Abstract: An apparatus and method for controlling a purge valve of a fuel cell vehicle are provided to reduce a consumption amount of hydrogen and improve fuel efficiency. In particular, whether oxygen concentration in a channel of an anode of a fuel cell stack exceeds a reference value is estimated while restarting the vehicle after the vehicle is parked. Then, an open time of a purge valve is adjusted based on a parking time of a vehicle when the hydrogen concentration is greater than the reference value.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: May 8, 2018
    Assignee: Hyundai Motor Company
    Inventors: Hyun Jae Lee, Hyo Seop Kim, Yei Sik Jeon, Bu Kil Kwon
  • Patent number: 9893372
    Abstract: A perceiving method and system of a stack state for a fuel cell system is provided. The method includes determining whether a vehicle provided with the fuel cell system is started and calculating a time until first condensate water is discharged through a condensate water discharging valve provided in the fuel cell system after the vehicle starts. Then, an average time until the first condensate water is discharged after the vehicle starts, at the previous starting of the vehicle is calculated over a predetermined number of times. The two calculated times are compared to determine the state of the stack or cathode of the fuel cell system without requiring additional separate components.
    Type: Grant
    Filed: April 26, 2015
    Date of Patent: February 13, 2018
    Assignee: Hyundai Motor Company
    Inventors: Hyun Jae Lee, Hyo Seop Kim, Yei Sik Jeon
  • Publication number: 20170301935
    Abstract: An apparatus for controlling a fuel cell stack includes: a map storage storing a target relative humidity map in which a target relative humidity corresponding to a vapor pressure of the fuel cell stack and a coolant temperature of the fuel cell stack is recorded; a pressure sensor measuring an outlet pressure of the fuel cell stack; a current sensor measuring a current generated by the fuel cell stack; a water temperature sensor measuring a coolant temperature of the fuel cell stack; and a fuel cell controller configured to determine a state of the fuel cell stack using a relative humidity of the fuel cell stack based on the target relative humidity map, and to set an amount of airflow or a coolant temperature according to the state of the fuel cell stack.
    Type: Application
    Filed: July 29, 2016
    Publication date: October 19, 2017
    Inventor: Yei Sik JEON
  • Publication number: 20170288245
    Abstract: A fuel cell purging control method for controlling hydrogen purge of a fuel cell including a stack having an anode and a cathode, an air supply device having an air supply line supplying air to the cathode of the stack, a back pressure adjusting valve adjusting back pressure of the air supply device, and a hydrogen supply device supplying hydrogen to the anode of the stack, includes steps of: determining hydrogen purge of the fuel cell while the fuel cell is being normally operated, reducing back pressure of the air supply line of the fuel cell when the hydrogen purge is determined, and purging hydrogen in the anode of the fuel cell for a preset period of time after the step of reducing the back pressure.
    Type: Application
    Filed: November 15, 2016
    Publication date: October 5, 2017
    Inventors: Hyun Jae Lee, Dae Jong Kim, Yei Sik Jeon
  • Patent number: 9660280
    Abstract: A system and method of controlling fuel cell system is provided that simultaneously drains condensation and purges hydrogen via single valve. In particular, condensate water is drained by opening a drain-purge valve at a point in time at which a production amount of the condensate water exceeds a capacity of a water trap. An opening time of the drain-purge valve is then determined depending on a hydrogen concentration of an anode side and a target hydrogen concentration after the draining the condensate water. Hydrogen is then purged by maintaining the drain-purge valve in a state in which it is opened for the determined opening time.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: May 23, 2017
    Assignee: Hyundai Motor Company
    Inventors: Hyun Jae Lee, Ik Jae Son, Yei Sik Jeon, Deuk Keun Ahn, Sung Bum Choi
  • Patent number: 9531019
    Abstract: Disclosed is a fuel cell system and a method for controlling the fuel cell system. In the method, an external air temperature and a fuel cell temperature are monitored. When a vehicle having the fuel cell system mounted therein is keyed on, a shut-off duration of the fuel cell system, a maximum external air temperature for the shut-off duration and a maximum fuel cell temperature for the shut-off duration are calculated. A gas composition of a fuel cell at a key-on time is estimated using the shut-off duration, the maximum external air temperature and the maximum fuel cell temperature. An ignition condition of the fuel cell system is set based on the estimated gas composition. Ignition of the fuel cell system is performed based on the set ignition condition.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: December 27, 2016
    Assignee: Hyundai Motor Company
    Inventor: Yei Sik Jeon
  • Publication number: 20160351925
    Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.
    Type: Application
    Filed: November 11, 2015
    Publication date: December 1, 2016
    Inventors: Hyun Jae Lee, Jong Hyun Lee, Deuk Kuen Ahn, Yei Sik Jeon