Patents by Inventor Jihan Ryu

Jihan 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: 20100017071
    Abstract: Mirrors on a motor vehicle are adjusted by monitoring the position of a first, preferably manually adjusted, mirror and adjusting the position of additional mirrors based on the monitored position of the first one of the mirrors.
    Type: Application
    Filed: July 16, 2008
    Publication date: January 21, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Jihan Ryu, Kwang-Keun Shin, Jin-Woo Lee, Bakhtiar Brian Litkouhi
  • Publication number: 20090310237
    Abstract: A vehicle-mounted system for automatically adjusting a viewing angle of at least one rear-view mirror of a vehicle. The system includes a sensing unit for detecting and obtaining the positional parameters of an object in a side blind zone of the vehicle. The system also includes a control unit that is capable of adjusting the rear-view mirror based on the positional parameters received from the sensing unit, to facilitate viewing of the object by a driver of the vehicle.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 17, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Kwang-Keun Shin, Jihan Ryu, Jin-Woo Lee
  • Publication number: 20090235724
    Abstract: A system and method for determining vehicle CG height and mass in real-time. The method includes selecting a set of vehicle parameters to be considered that includes the vehicle mass and the center of gravity height of the vehicle. Frequency responses are generated using the dynamic model and a plurality of different values for the selected vehicle parameters. During vehicle operation, frequency responses are calculated from a measured vehicle lateral acceleration to a roll angle and/or a roll rate of the vehicle. The generated frequency responses and the calculated frequency responses are compared to determine which of the generated frequency responses more closely matches the calculated frequency responses. The generated frequency responses that most closely match the calculated frequency responses are used to determine the center of gravity height and the vehicle mass from the values for the vehicle parameters.
    Type: Application
    Filed: March 19, 2008
    Publication date: September 24, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Jihan Ryu, Nikolai K. Moshchuk, Shih-Ken Chen
  • Patent number: 7571030
    Abstract: A system and method for estimating vehicle roll rate and roll angle. The system includes a suspension deflection sensor provided at each wheel of the vehicle that provides suspension measurement signals indicative of the roll of the vehicle. The system also includes a roll rate estimator that uses the suspension measurement signals and an estimated tire deflection of the wheels to provide a roll rate estimation signal. The system also includes a vehicle roll angle and a roll rate estimator that uses the roll rate estimation signal and a dynamic model to estimate the roll angle and refine the roll rate. The roll rate estimator calculates the roll rate one way if none of the vehicle wheels are off of the ground and calculates it another way if any of the wheels are off of the ground.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: August 4, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Jihan Ryu, Shih-Ken Chen, Nikolai K. Moshchuk
  • Publication number: 20090062983
    Abstract: An analytical methodology for the specification of progressive optimal compression damping of a suspension system to negotiate severe events, yet provides very acceptable ride quality and handling during routine events. In a broad aspect, the method provides a progressive optimal unconstrained damping response of the wheel assembly with respect to the body. In a preferred aspect, the method provides a progressive optimal constrained damping response of the wheel assembly with respect to the body, wherein below a predetermined velocity a conventional damper force is retained.
    Type: Application
    Filed: November 14, 2007
    Publication date: March 5, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Richard J. Knoll, William Golpe, Nikolai K. Moshchuk, Chandra S. Namuduri, Flavio Nardi, Jihan Ryu, Raviraj U. Nayak
  • Publication number: 20080306687
    Abstract: A vehicle includes a GPS system and a longitudinal accelerometer. Accelerometer corrections are derived based on GPS velocity data. Individual wheel speeds are determined based on GPS velocity data. Longitudinal vehicle velocity may be determined based on accelerometer data or individual wheel speeds.
    Type: Application
    Filed: June 5, 2007
    Publication date: December 11, 2008
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Jihan Ryu, Cheng-Foo Chen
  • Publication number: 20080281488
    Abstract: A system for providing vehicle roll control that controls the friction-force of dampers provided at the wheels of the vehicle. The system includes a lateral acceleration sensor for determining the lateral acceleration of the vehicle, a steering angle sensor for determining the steering angle of the vehicle and a speed sensor for determining the speed of the vehicle. The system calculates a current control signal for one or more of the dampers based on the lateral acceleration and/or the steering angle, and uses one or both of the current control signals to control the friction-force of the inside, outside or both of the dampers.
    Type: Application
    Filed: August 22, 2007
    Publication date: November 13, 2008
    Applicant: GM Global Technology Operations, Inc.
    Inventors: Jihan Ryu, Chandra S. Namuduri
  • Patent number: 7440824
    Abstract: A system and method for estimating vehicle side-slip velocity that includes measuring the lateral acceleration of the vehicle, measuring the yaw rate of the vehicle, measuring the longitudinal speed of the vehicle and measuring the steering angle of the vehicle. The measured longitudinal speed is corrected to provide a true longitudinal speed using a filter factor based on the vehicle-dependent parameters and a steering angle. A constant is defined based on the measured longitudinal speed and a function is defined based on the combination of the vehicle-dependent parameters and the lateral acceleration. Side-slip acceleration is calculated using the measured lateral acceleration, the true longitudinal speed, the yaw rate, the constant and the function.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: October 21, 2008
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Shih-Ken Chen, Jihan Ryu, Nikolai K. Moshchuk
  • Publication number: 20070239320
    Abstract: A system and method for estimating vehicle roll rate and roll angle. The system includes a suspension deflection sensor provided at each wheel of the vehicle that provides suspension measurement signals indicative of the roll of the vehicle. The system also includes a roll rate estimator that uses the suspension measurement signals and an estimated tire deflection of the wheels to provide a roll rate estimation signal. The system also includes a vehicle roll angle and a roll rate estimator that uses the roll rate estimation signal and a dynamic model to estimate the roll angle and refine the roll rate. The roll rate estimator calculates the roll rate one way if none of the vehicle wheels are off of the ground and calculates it another way if any of the wheels are off of the ground.
    Type: Application
    Filed: April 10, 2006
    Publication date: October 11, 2007
    Inventors: Jihan Ryu, Shih-Ken Chen, Nikolai Moshchuk
  • Publication number: 20070185623
    Abstract: A system and method for detecting vehicle wheel lift. The system includes wheel speed sensors for measuring the speed of each wheel of the vehicle, and suspension sensors for measuring the position of the vehicle suspension at each wheel of the vehicle. A controller determines whether any of the wheels are off the ground by using a kinematic relationship that uses the wheel speed signals and independently determines whether any of the wheels are off the ground by using damper spring displacement from the suspension sensors.
    Type: Application
    Filed: February 3, 2006
    Publication date: August 9, 2007
    Inventors: Shih-Ken Chen, Jihan Ryu, Cheng-Foo Chen
  • Publication number: 20070112474
    Abstract: A system and method for estimating vehicle side-slip velocity that includes measuring the lateral acceleration of the vehicle, measuring the yaw rate of the vehicle, measuring the longitudinal speed of the vehicle and measuring the steering angle of the vehicle. The measured longitudinal speed is corrected to provide a true longitudinal speed using a filter factor based on the vehicle-dependent parameters and a steering angle. A constant is defined based on the measured longitudinal speed and a function is defined based on the combination of the vehicle-dependent parameters and the lateral acceleration. Side-slip acceleration is calculated using the measured lateral acceleration, the true longitudinal speed, the yaw rate, the constant and the function.
    Type: Application
    Filed: November 16, 2005
    Publication date: May 17, 2007
    Inventors: Shih-Ken Chen, Jihan Ryu, Nikolai Moshchuk