Patents by Inventor Youngjoo Woo

Youngjoo Woo 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).

  • Control device for continuously variable transmission
    Patent number: 9279496
    Abstract: A frictional engagement element (32) that disconnects power between an engine (1) and a drive wheel (7) in a vehicle, and a control unit (11, 12) that controls a transmission ratio of a continuously variable transmission (4) and the frictional engagement element (32), are provided. When the transmission ratio is not a maximum transmission ratio at a vehicle stop when a vehicle speed is 0, the control unit (11, 12) operates the transmission ratio to the maximum transmission ratio while controlling the frictional engagement element (32) into a slip state. Further, at this time, when a road is an upward slope, the control unit (11, 12) sets an engagement pressure of the frictional engagement element (32) and an engine torque according to the road slope, prevents slide-down of the vehicle.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: March 8, 2016
    Assignee: JATCO LTD
    Inventors: Youngjoo Woo, Jongkeun Lim, Junseok Choi, Changnam Park, MyongSeog Chang
  • CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION
    Publication number: 20150066320
    Abstract: A frictional engagement element (32) that disconnects power between an engine (1) and a drive wheel (7) in a vehicle, and a control unit (11, 12) that controls a transmission ratio of a continuously variable transmission (4) and the frictional engagement element (32), are provided. When the transmission ratio is not a maximum transmission ratio at a vehicle stop when a vehicle speed is 0, the control unit (11, 12) operates the transmission ratio to the maximum transmission ratio while controlling the frictional engagement element (32) into a slip state. Further, at this time, when a road is an upward slope, the control unit (11, 12) sets an engagement pressure of the frictional engagement element (32) and an engine torque according to the road slope, prevents slide-down of the vehicle.
    Type: Application
    Filed: April 1, 2013
    Publication date: March 5, 2015
    Applicant: JATCO LTD
    Inventors: Youngjoo Woo, Jongkeun Lim, Junseok Choi, Changnam Park, MyongSeog Chang