Patents by Inventor Min-Su Kang

Min-Su Kang 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: 10998539
    Abstract: A secondary battery is disclosed. According to the present invention, when an internal pressure exceeding a certain level occurs, current may be interrupted to stop an operation of the secondary battery, thereby preventing the secondary battery from being ignited or exploded by the increase in internal pressure of the secondary battery and improving safety of the secondary battery.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: May 4, 2021
    Inventors: Sang Hun Kim, Yong Kim, Yong Su Choi, Hyung Kyun Yu, Soo Ji Hwang, Na Yoon Kim, Min Hyeong Kang
  • Publication number: 20210123683
    Abstract: A heat exchanger including: an inlet portion having a first flow path through which a fluid is introduced; a main body including a shell and a plurality of tubes. The shell has an internal space and one surface that has a plurality of penetration holes and a cross-sectional area larger than a cross-sectional area of the first flow path. Each of the plurality of tubes allows the fluid to flow therethrough, and is positioned in the internal space of the shell. An expanded tube portion connects the inlet portion and the one surface of the shell and has a second flow path. The heat exchanger also includes a fluid flow distributor disposed in the second flow path to distribute the flow of the fluid. No other member is disposed between the inlet portion and the multiple ring members.
    Type: Application
    Filed: November 15, 2018
    Publication date: April 29, 2021
    Inventors: Sun Young Kim, Jong Hyuk Park, Ye Hoon Im, Jeong Hyuk Won, Jun Won Choi, Min Su Kang
  • Publication number: 20210114875
    Abstract: Disclosed is a method of purifying boron nitride nanotubes through a simplified process. Specifically, the method includes preparing a starting solution containing boron nitride nanotubes (BNNTs), a dispersant and a solvent, centrifuging the starting solution or allowing the starting solution to stand to collect a supernatant, adding an acid to the supernatant and filtering a resulting product.
    Type: Application
    Filed: April 9, 2020
    Publication date: April 22, 2021
    Inventors: Seokhoon AHN, Se Gyu JANG, Myung Jong KIM, Hun-Su LEE, Soul-Hee LEE, Min Sung KANG, Sangseok LEE, Yongho JOO
  • Patent number: 10978724
    Abstract: A method for removing residual water in a fuel cell stack includes: blocking, by an air compressor, air supply to a fuel cell stack upon shutting down of fuel cell; measuring a cell voltage of the fuel cell stack while the air supply is blocked; estimating an amount of residual water in the fuel cell stack based on the measured cell voltage of the fuel cell stack; and removing, by a driving controller, the residual water in the fuel cell stack by driving the air compressor based on the estimated amount of water.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: April 13, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Chang Seok You, Sung Do Kim, Min Su Kang, Soon Woo Kwon, Dong Hun Lee
  • Publication number: 20210104968
    Abstract: Provided is a method of controlling a sensorless motor for an air compressor. The method controls early driving of a sensorless motor for an air compressor, overcomes related-art problems, and improves control response. A position of a rotor of the motor, finally estimated by a sensorless control logic at a point in time at which the motor is determined to be in the stopped state, is determined to be an alignment target position. An alignment start position is determined from the alignment target position in accordance with a predetermined alignment offset angle. The position of the rotor of the motor is controlled to change from the determined alignment start position to the alignment target position.
    Type: Application
    Filed: September 2, 2020
    Publication date: April 8, 2021
    Inventors: Chang Seok You, Sung Do Kim, Min Su Kang
  • Publication number: 20210083306
    Abstract: An operation control system and method of a fuel cell vehicle are provided. The system includes a fuel cell, an air supply device operated by a motor, to supply air to the fuel cell and a sensing unit that senses an abnormal operation of the air supply device. A calculation unit calculates a lower-limit voltage of the air supply device required for normal operation of the air supply device when the sensing unit senses abnormal operation of the air supply device. A controller then adjusts a voltage supplied to the air supply device based on the calculated lower-limit voltage.
    Type: Application
    Filed: January 15, 2020
    Publication date: March 18, 2021
    Inventors: Sung Do Kim, Chang Seok You, Min Su Kang
  • Publication number: 20210028734
    Abstract: A method of controlling a sensorless motor of an air compressor is provided to overcome the known problems of sensorless control methods and to improve control responsiveness. In various aspects of the present invention, a method of controlling a sensorless motor of an air compressor includes: performing a speed control for stopping a motor by a controller; determining a motor stopped state from an estimated motor speed while the speed control is performed by the controller; determining a rotor position estimated as a fixed position when the motor stopped state is determined by the controller; performing motor position control for moving the rotor position to the fixed position when the motor stopped state is determined; and starting sensorless control for driving the motor by setting the fixed position to an initial position when requesting a motor driving while the rotor position is maintained at the fixed position.
    Type: Application
    Filed: June 22, 2020
    Publication date: January 28, 2021
    Inventors: Chang Seok You, Min Su Kang, Sung Do Kim, Dong Hun Lee
  • Patent number: 10903768
    Abstract: A method of correcting a signal delay of a Hall sensor for an air compressor motor when the air compressor motor rotates at a high speed includes: a first step of calculating an offset angle ? from a voltage equation, to which a q-axis voltage and a d-axis voltage are applied, by performing zero current control when an inertia braking section occurs during an operation of the motor; a second step of calculating a reference offset angle ?offset of the Hall sensor and a delay time t by using an angular velocity ? at any two points in the inertia braking section by using the equation for calculating the offset angle ?; and a third step of calculating a corrected q-axis voltage and a corrected d-axis voltage through the zero current control corrected and comparing the corrected q-axis voltage and the corrected d-axis voltage with a reference error.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: January 26, 2021
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Sung-Do Kim, Min-Su Kang, Chang-Seok You, Dong-Hun Lee
  • Patent number: 10899238
    Abstract: A control apparatus of a vehicle can include: a controller configured to control an operation function of the vehicle; and a power supply unit configured to supply power to the controller or to cut off power supply thereto. The power supply unit can include a) a key hold circuit storing a key hold-on/off state of the key hold circuit corresponding to a key hold function of supplying power to the controller after the control apparatus shuts down and b) a power supply determiner determining whether to supply the power to the controller.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: January 26, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Chang Seok You, Min Su Kang, Sung Do Kim, Dong Hun Lee
  • Patent number: 10826095
    Abstract: An air supply control method and system for a fuel cell controlling a switching frequency of an inverter at which power consumption of the air compressor becomes minimal includes: calculating a revolution per minute (RPM) of a motor of an air compressor; calculating a switching frequency of an inverter of the motor of the air compressor at which power consumption becomes minimal based on the calculated RPM of the motor; and controlling the inverter with the calculated switching frequency.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: November 3, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Chang Seok You, Min Su Kang, Sung Do Kim, Dong Hun Lee
  • Patent number: 10768234
    Abstract: A method for estimating power consumption of a motor includes steps of: determining an error voltage for a terminal voltage of each of multiple phases of the motor, the terminal voltage being supplied from an inverter to the motor; generating a compensation terminal voltage for each of the multiple phases of the motor by applying the error voltage to a prediction value of the terminal voltage that is derived in a preset manner during operation of the motor; and calculating power consumption of the motor by using the compensation terminal voltage and a current value obtained by detecting a current that flows in each of the multiple phases of the motor.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: September 8, 2020
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Dong Hun Lee, Chang Seok You, Min Su Kang, Sung Do Kim
  • Patent number: 10752114
    Abstract: A motor drive control method is provided for controlling a speed of a motor such that a measured speed value of the motor follows a speed command value. The motor drive control method includes an on/off driving operation of driving a torque of the motor based on the speed command value in such a way that the torque of the motor is repeatedly turned on/off on preset cycle and duty. The motor drive control method and system can markedly enhance efficiency of a motor by reducing switching loss and current ripple loss of an inverter in a low-speed driving period of a high-speed motor.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: August 25, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hun Lee, Chang Seok You, Min Su Kang, Sung Do Kim
  • Patent number: 10756601
    Abstract: A control method of a motor rotation speed may include calculating a q-axis potential difference of a synchronous coordinate system for controlling a q-axis current of the synchronous coordinate system based on a target rotation speed of a motor and a measured rotation speed value of the speed sensor, calculating a voltage command of the synchronous coordinate system based on the calculated q-axis potential difference of the synchronous coordinate system, and controlling an inverter connected to the motor according to the calculated voltage command of the synchronous coordinate system.
    Type: Grant
    Filed: August 5, 2018
    Date of Patent: August 25, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hun Lee, Sung Do Kim, Chang Seok You, Min Su Kang, Soon Il Jeon
  • Patent number: 10720862
    Abstract: A method of calculating a motor position uses a hall sensor. The method can include determining a motor position in response to a signal change of a hall sensor installed to a motor, calculating a basic compensation value for compensating a motor position error due to signal measurement delay of the hall sensor, determining whether a current command condition for a constant-speed operation of the motor is satisfied, calculating a first-up compensation value and a first-down compensation value, calculating an average values of the deviation between d-q axes current commands, and correcting the motor position using the basic compensation value when a difference between the average values is less than a reference average value.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: July 21, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Sung Do Kim, Chang Seok You, Min Su Kang, Joon Yong Lee, Dong Hun Lee
  • Publication number: 20200220487
    Abstract: A method of correcting a signal delay of a Hall sensor for an air compressor motor when the air compressor motor rotates at a high speed includes: a first step of calculating an offset angle ? from a voltage equation, to which a q-axis voltage and a d-axis voltage are applied, by performing zero current control when an inertia braking section occurs during an operation of the motor; a second step of calculating a reference offset angle ?offset of the Hall sensor and a delay time t by using an angular velocity ? at any two points in the inertia braking section by using the equation for calculating the offset angle ?; and a third step of calculating a corrected q-axis voltage and a corrected d-axis voltage through the zero current control corrected and comparing the corrected q-axis voltage and the corrected d-axis voltage with a reference error.
    Type: Application
    Filed: October 4, 2019
    Publication date: July 9, 2020
    Applicants: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Sung-Do Kim, Min-Su Kang, Chang-Seok You, Dong-Hun Lee
  • Publication number: 20200144643
    Abstract: A method of controlling an air compressor motor for a fuel cell vehicle is provide. The method includes calculating a counter electromotive force constant of the air compressor motor based on a voltage and a current of the air compressor motor for the fuel cell vehicle supplying air to a fuel cell stack and a rotation speed of the air compressor motor. The method additionally includes determining whether a permanent magnet of the air compressor motor is demagnetized based on a result of comparison between the calculated counter electromotive force constant value and a pre-set counter electromotive force constant design value.
    Type: Application
    Filed: April 16, 2019
    Publication date: May 7, 2020
    Inventors: Sung Do Kim, Min Su Kang, Chang Seok You, Dong Hun Lee
  • Publication number: 20200119375
    Abstract: A method for removing residual water in a fuel cell stack includes: blocking, by an air compressor, air supply to a fuel cell stack upon shutting down of fuel cell; measuring a cell voltage of the fuel cell stack while the air supply is blocked; estimating an amount of residual water in the fuel cell stack based on the measured cell voltage of the fuel cell stack; and removing, by a driving controller, the residual water in the fuel cell stack by driving the air compressor based on the estimated amount of water.
    Type: Application
    Filed: November 20, 2018
    Publication date: April 16, 2020
    Inventors: Chang Seok YOU, Sung Do KIM, Min Su KANG, Soon Woo KWON, Dong Hun LEE
  • Patent number: 10613500
    Abstract: A method for controlling a temperature of a heating element can include: measuring a temperature of the heating element using a temperature sensor; estimating a temperature of the heating element based on a heat transfer model of the heating element; calculating a variation of the estimated temperature and a variation of the measured temperature; and determining whether a failure of the temperature sensor occurs based on the calculated variation of the estimated temperature and the calculated variation of the measured temperature.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: April 7, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hun Lee, Chang Seok You, Min Su Kang, Sung Do Kim
  • Patent number: 10579484
    Abstract: An operating method of a vehicle watchdog circuit is provided. The method includes monitoring whether communication with a vehicle controller through a preset protocol is enabled and when a communication fault does not occur by monitoring whether communication is enabled, transmitting an error detection query to the vehicle controller every preset period. A response to the error detection query is received, and an operation of the vehicle controller is monitored, and upon determining that the operation of the vehicle controller is normal, a plurality of preset reset signals are sequentially transmitted to the vehicle controller.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: March 3, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Chang Seok You, Min Su Kang, Sung Do Kim, Dong Hun Lee
  • Patent number: 10554158
    Abstract: A motor control method that includes: calculating an ideal position of a motor rotor based on a Hall sensor signal; calculating a current position of the motor rotor based on a rotation speed of the motor rotor; and calculating a Hall sensor offset angle as the difference between the ideal position of the motor rotor and the current position of the motor rotor.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: February 4, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hun Lee, Sung Do Kim, Chang Seok You, Min Su Kang, Joon Yong Lee