Patents by Inventor Ji Wan Cha

Ji Wan Cha 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: 11745721
    Abstract: A method of controlling an electric oil pump configured for a vehicle, may include a step of determining whether a vehicle has entered a sloped road, a step of determining whether a drive motor of the vehicle is in one or more overheatable conditions when it is determined that the vehicle has entered a sloped road, a step of determining whether the overheatable condition is maintained over a preset reference time when it is determined that the vehicle is in the over-heatable condition; and a step of supplying a pulse to an RPM input for the electric oil pump when it is determined that the duration of the over-heatable condition exceeds the preset reference time.
    Type: Grant
    Filed: May 10, 2021
    Date of Patent: September 5, 2023
    Assignees: Hyundai Motor Company, Kia Corporation
    Inventors: Jae Hyeon Lee, Jae Woo Shim, Ji Wan Cha
  • Patent number: 11742720
    Abstract: A motor with a cooling system is provided. The motor includes a cooling system cooling a stator with coils wound on a core, in which the cooling system includes a plurality of spray pipes having a plurality of holes and spraying oil through the holes, the plurality of spray pipes is positioned between the stator and a housing of the motor, and the plurality of spray pipes includes pipes disposed at a center over the stator and at both sides spaced apart from each other in a circumferential direction of the stator from the center with predetermined gaps therebetween.
    Type: Grant
    Filed: July 6, 2020
    Date of Patent: August 29, 2023
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Jae Hyeon Lee, Han Hee Park, Seong Min Kim, Hyun Woo Noh, Tae Il Yoo, Ji Wan Cha
  • Patent number: 11545875
    Abstract: A motor is provided. The motor includes a cooling system configured to cool a stator having a core wound around by a coil, wherein the cooling system includes oil holders installed on a side under the stator in an inner space of a motor housing and provided to allow oil to be collected up to a level capable of allowing at least some of a lower end section of the stator to be immersed for cooling.
    Type: Grant
    Filed: June 11, 2020
    Date of Patent: January 3, 2023
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Jae Hyeon Lee, Jeong Bin Yim, Jin Ho Kim, Tae Kil Kim, Dae Woong Han, Ji Wan Cha
  • Patent number: 11411524
    Abstract: A power conversion system includes an inverter having a three-phase circuit including a plurality of power semiconductor devices and configured to supply driving power to a motor according to an applied torque command, and a controller configured to predict a maximum temperature of the inverter based on an actual measured temperature of any one of the plurality of power semiconductor devices and phase current of the motor, and to actively limit the torque command depending on the predicted maximum temperature of the inverter.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: August 9, 2022
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Tae II Yoo, Jae Hyeon Lee, Seong Min Kim, Hyun Woo Noh, Han Hee Park, Ji Wan Cha
  • Publication number: 20220055603
    Abstract: A method of controlling an electric oil pump configured for a vehicle, may include a step of determining whether a vehicle has entered a sloped road, a step of determining whether a drive motor of the vehicle is in one or more overheatable conditions when it is determined that the vehicle has entered a sloped road, a step of determining whether the overheatable condition is maintained over a preset reference time when it is determined that the vehicle is in the over-heatable condition; and a step of supplying a pulse to an RPM input for the electric oil pump when it is determined that the duration of the over-heatable condition exceeds the preset reference time.
    Type: Application
    Filed: May 10, 2021
    Publication date: February 24, 2022
    Applicants: Hyundai Motor Company, Kia Corporation
    Inventors: Jae Hyeon Lee, Jae Woo Shim, Ji Wan Cha
  • Publication number: 20210313924
    Abstract: A power conversion system includes an inverter having a three-phase circuit including a plurality of power semiconductor devices and configured to supply driving power to a motor according to an applied torque command, and a controller configured to predict a maximum temperature of the inverter based on an actual measured temperature of any one of the plurality of power semiconductor devices and phase current of the motor, and to actively limit the torque command depending on the predicted maximum temperature of the inverter.
    Type: Application
    Filed: December 15, 2020
    Publication date: October 7, 2021
    Inventors: Tae Il Yoo, Jae Hyeon Lee, Seong Min Kim, Hyun Woo Noh, Han Hee Park, Ji Wan Cha
  • Patent number: 11133765
    Abstract: An apparatus for driving a motor for an eco-friendly vehicle is provided. The apparatus includes a motor that has a rotor and a stator and a controller that operates the motor. The motor includes a plurality of stator coils and stator relays and the controller operates the stator relays based on an operation mode to adjust the number of turns of the stator coils.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: September 28, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Ji Wan Cha, Han Hee Park, Jae Hyeon Lee, Seong Min Kim, Hyun Woo Noh, Tae Il Yoo
  • Publication number: 20210067006
    Abstract: A motor with a cooling system is provided. The motor includes a cooling system cooling a stator with coils wound on a core, in which the cooling system includes a plurality of spray pipes having a plurality of holes and spraying oil through the holes, the plurality of spray pipes is positioned between the stator and a housing of the motor, and the plurality of spray pipes includes pipes disposed at a center over the stator and at both sides spaced apart from each other in a circumferential direction of the stator from the center with predetermined gaps therebetween.
    Type: Application
    Filed: July 6, 2020
    Publication date: March 4, 2021
    Applicants: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Jae Hyeon Lee, Han Hee Park, Seong Min Kim, Hyun Woo Noh, Tae Il Yoo, Ji Wan Cha
  • Publication number: 20210050764
    Abstract: A motor is provided. The motor includes a cooling system configured to cool a stator having a core wound around by a coil, wherein the cooling system includes oil holders installed on a side under the stator in an inner space of a motor housing and provided to allow oil to be collected up to a level capable of allowing at least some of a lower end section of the stator to be immersed for cooling.
    Type: Application
    Filed: June 11, 2020
    Publication date: February 18, 2021
    Inventors: Jae Hyeon Lee, Jeong Bin Yim, Jin Ho Kim, Tae Kil Kim, Dae Woong Han, Ji Wan Cha
  • Publication number: 20200136535
    Abstract: An apparatus for driving a motor for an eco-friendly vehicle is provided. The apparatus includes a motor that has a rotor and a stator and a controller that operates the motor. The motor includes a plurality of stator coils and stator relays and the controller operates the stator relays based on an operation mode to adjust the number of turns of the stator coils.
    Type: Application
    Filed: June 10, 2019
    Publication date: April 30, 2020
    Inventors: Ji Wan Cha, Han Hee Park, Jae Hyeon Lee, Seong Min Kim, Hyun Woo Noh, Tae Il Yoo
  • Patent number: 10131346
    Abstract: A method for diagnosing demagnetization of a motor of a vehicle can accurately diagnose an irreversible demagnetization state of a permanent magnet of a traction motor or a hybrid starter-generator (HSG) without additional hardware, while minimizing influence of irreversible demagnetization of the permanent magnet of the traction motor or the HSG on vehicle performance. The method includes acquiring operating state information of the motor, determining whether a diagnosis entrance condition including a state in which the motor performs an electricity generating operation is satisfied based on the acquired operating state information of the motor, acquiring a direct current (DC) value in diagnosis, and determining whether irreversible demagnetization occurs by comparing the acquired DC value in diagnosis with a pre-stored DC current value in a normal state of the permanent magnet.
    Type: Grant
    Filed: December 5, 2015
    Date of Patent: November 20, 2018
    Assignee: Hyundai Motor Company
    Inventors: Seong Min Kim, Jae Sang Lim, Kil Young Youn, Ji Wan Cha, Young Un Kim, Jeong Won Rho
  • Publication number: 20180095131
    Abstract: A method of diagnosing a magnetization fault of a permanent magnet motor is provided. The method includes calculating a resolver offset value for offset correction of a resolver mounted at the motor, calculating a correction deviation, namely, a difference value between the calculated resolver offset value and a predetermined reference value to compare the calculated correction deviation to an allowable error, comparing a difference value between the calculated correction deviation and a predetermined phase difference value of reverse magnetization of the permanent magnet to the allowable error when the calculated correction deviation is more than the allowable error, and determining that the motor is in a reversely magnetized state when the difference value between the calculated correction deviation and the predetermined phase difference value of reverse magnetization of the permanent magnet is equal to or less than the allowable error.
    Type: Application
    Filed: December 29, 2016
    Publication date: April 5, 2018
    Applicant: HYUNDAI MOTOR COMPANY
    Inventors: Ji Wan Cha, Gu Bae Kang, Jae Sang Lim, Seong Yeop Lim, Young Un Kim
  • Publication number: 20160368487
    Abstract: A method for diagnosing demagnetization of a motor of a vehicle can accurately diagnose an irreversible demagnetization state of a permanent magnet of a traction motor or a hybrid starter-generator (HSG) without additional hardware, while minimizing influence of irreversible demagnetization of the permanent magnet of the traction motor or the HSG on vehicle performance. The method includes acquiring operating state information of the motor, determining whether a diagnosis entrance condition including a state in which the motor performs an electricity generating operation is satisfied based on the acquired operating state information of the motor, acquiring a direct current (DC) value in diagnosis, which is used for diagnosis of irreversible demagnetization of the motor when the diagnosis entrance condition is satisfied, and determining whether irreversible demagnetization occurs by comparing the acquired DC value in diagnosis with a pre-stored DC current value in a normal state of the permanent magnet.
    Type: Application
    Filed: December 5, 2015
    Publication date: December 22, 2016
    Inventors: Seong Min Kim, Jae Sang Lim, Kil Young Youn, Ji Wan Cha, Young Un Kim, Jeong Won Rho
  • Patent number: 9428174
    Abstract: A method of forcibly charging a high-voltage battery using a motor and a Hybrid Starter Generator (HSG) is provided. The method forcibly charges the high-voltage battery with maximum charging power using the motor and the HSG simultaneously. Particularly, the method includes calculating maximum chargeable power for the high-voltage battery using three dimensional (3D) maximum charging power maps of the motor and the HSG and adjusting maximum charging power using energy integration during forced charging using the motor and the HSG simultaneously. Additionally, excessive temperature prevention logics are applied for protecting the motor and the HSG from an excessive temperature in a forced charging mode.
    Type: Grant
    Filed: December 13, 2014
    Date of Patent: August 30, 2016
    Assignee: Hyundai Motor Company
    Inventors: Jae Sang Lim, Gu Bae Kang, Young Un Kim, Kil Young Youn, Jeong Won Roh, Ji Wan Cha, Jin Ho Kim, Seong Yeop Lim
  • Patent number: 9413279
    Abstract: An apparatus and a method for controlling a motor are provided. The apparatus for controlling a motor includes a temperature sensor that is configured to detect a temperature of an inverter, and a variable amplifier that is configured to variably set an amplification gain that corresponds to the detected temperature of the inverter and amplify and output a resolver signal output from a resolver based on the variably set amplification gain, based on an excitation signal. A controller is then configured to estimate a position of a motor rotor based on the amplified resolver signal to calculate a flux angle and an excitation signal generator is configured to generate the excitation signal that corresponds to the calculated flux angle and output the generated excitation signal to the resolver.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: August 9, 2016
    Assignee: Hyundai Motor Company
    Inventors: Jeong Won Rho, Young Un Kim, Jae Sang Lim, Kil Young Youn, Ji Wan Cha, Seong Min M. Kim, Jin Ho Kim, Gu Bae Kang
  • Patent number: 9310456
    Abstract: An offset compensation method of a current sensor is provided for determining whether an offset compensation of the current sensor is abnormal, and a motor driving system includes the current sensor. The offset compensation method includes: compensating for an offset of the current sensor, and determining whether the offset compensation of the current sensor is abnormal.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: April 12, 2016
    Assignee: Hyundai Motor Company
    Inventors: Jae-Sang Lim, Seong Yeop Lim, Gu Bae Kang, Ji Wan Cha
  • Publication number: 20160087561
    Abstract: An apparatus and a method for controlling a motor are provided. The apparatus for controlling a motor includes a temperature sensor that is configured to detect a temperature of an inverter, and a variable amplifier that is configured to variably set an amplification gain that corresponds to the detected temperature of the inverter and amplify and output a resolver signal output from a resolver based on the variably set amplification gain, based on an excitation signal. A controller is then configured to estimate a position of a motor rotor based on the amplified resolver signal to calculate a flux angle and an excitation signal generator is configured to generate the excitation signal that corresponds to the calculated flux angle and output the generated excitation signal to the resolver.
    Type: Application
    Filed: December 10, 2014
    Publication date: March 24, 2016
    Inventors: Jeong Won Rho, Young Un Kim, Jae Sang Lim, Kil Young Youn, Ji Wan Cha, Seong Min M. Kim, Jin Ho Kim, Gu Bae Kang
  • Publication number: 20160046279
    Abstract: The present disclosure provides a method of forcibly charging a high-voltage battery using a motor and a Hybrid Starter Generator (HSG) which is capable of forcibly charging the high-voltage battery with maximum charging power using the motor and the HSG simultaneously. The method does so by calculating maximum chargeable power for the high-voltage battery using three dimensional (3D) maximum charging power maps of the motor and the HSG, adjusting maximum charging power using energy integration during forced charging using the motor and the HSG simultaneously, and applying excessive temperature prevention logics for protecting the motor and the HSG from an excessive temperature in a forced charging mode.
    Type: Application
    Filed: December 13, 2014
    Publication date: February 18, 2016
    Inventors: Jae Sang Lim, Gu Bae Kang, Young Un Kim, Kil Young Youn, Jeong Won Roh, Ji Wan Cha, Jin Ho Kim, Seong Yeop Lim
  • Publication number: 20160031440
    Abstract: A method and system for controlling a hybrid vehicle are provided to supply oil pressure to a transmission using an electric oil pump. The method for controlling a hybrid vehicle including an engine, a driving motor, and an engine clutch connecting between the engine and the driving motor includes: detecting a failure of high voltage components for the hybrid vehicle including an air conditioner, a heater, and a low voltage DC-DC converter (LDC). In response to determining a failure of at least one of the high voltage components an operation of the high voltage components in a normal state are turned off. The electric oil pump is operated with a counter electromotive force generated from the driving motor by operating the driving motor with power of the engine while a speed (RPM) of the engine is maintained at a predetermined minimum demand speed or greater.
    Type: Application
    Filed: November 18, 2014
    Publication date: February 4, 2016
    Inventors: Kil Young Youn, Gu Bae Kang, Ji Wan Cha, Jinho Kim, Sang-Hwan Kim, Jae-Sang Lim
  • Publication number: 20150175015
    Abstract: A control method of electric vehicle according to an exemplary embodiment of the present invention may include a battery supplying electricity, a motor receiving electricity from the battery and generating power, and a controller controlling the battery and the motor, wherein the controller executes instructions for: detecting a torque command, a motor speed, and a motor current; calculating a motor voltage from the motor current; determining whether voltage utilization according to a speed range of the motor is higher than a predetermined value; generating an operating point correcting function according to the motor speed when the voltage utilization is not higher than the predetermined value; calculating a current command according to the motor speed from the operating point correcting function; and outputting the calculated current command.
    Type: Application
    Filed: October 31, 2014
    Publication date: June 25, 2015
    Inventors: Jae-Sang Lim, Seong Yeop Lim, Gu Bae Kang, Ji Wan Cha, Young Un Kim