Patents by Inventor Chun-Han Lee

Chun-Han Lee 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: 20180002896
    Abstract: A drive control method of a hydraulic actuator of a construction machine includes: determining whether a rotation operation lever and a working device operation lever are operated; calculating the required pressure of a hydraulic cylinder fix a working device according to the operation amount of the rotation operation lever; calculating the required flow rates of a swing motor and the hydraulic cylinder for the working device, the required flow rates corresponding to the operation amounts of the working device operation lever and the rotation operation lever; calculating the opening areas of the first and second proportional solenoid valves of an inlet side and an outlet side by using the calculated required pressure and required flow rates of the hydraulic cylinder for the working device and the swing motor; and calculating current values to be inputted into the first and second proportional solenoid valves of the inlet side and the outlet side according to preset data values or a table in comparison with th
    Type: Application
    Filed: January 8, 2015
    Publication date: January 4, 2018
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Tae-Rang JUNG, Chun-Han LEE
  • Patent number: 9765503
    Abstract: The present invention relates to a hydraulic control system for construction machinery capable of variably adjusting a set pressure of a relief valve, which controls a set pressure of a hydraulic system, according to a value inputted by means of pressure in the hydraulic system or the manipulation of a joystick.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: September 19, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Patent number: 9725882
    Abstract: A flow control apparatus and a flow control method for a construction machine are disclosed, which can perform ground leveling work for smoothing the ground by the self weight of a boom without supplying hydraulic fluid from a hydraulic pump to a hydraulic cylinder.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: August 8, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20170125803
    Abstract: An electrode material for a lithium ion battery includes conductive active particles and an ionic cover layer covering the active particles. The ionic cover layer includes a matrix of functional group-substituted polyaryletherketone and graphene particles dispersed in the matrix. A method for preparing the electrode material and an electrode including the electrode material are also disclosed.
    Type: Application
    Filed: January 11, 2017
    Publication date: May 4, 2017
    Inventors: Kuo-Feng CHIU, Po-Nien LAI, Shin-Lee LIU, Chun-Han LEE
  • Patent number: 9562345
    Abstract: A traveling control method for performing a smoothing work or the like through an operation of a working device during traveling is provided.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: February 7, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20170016460
    Abstract: Disclosed are a device for controlling a regenerated flow rate for a construction machine and a method for controlling the same, the device being able to supply a large chamber of an arm cylinder with a part of operating oil, which is discharged from the arm cylinder to an operating oil tank during arm-in driving, and regenerating the same. The present invention provides a device for controlling a regenerated flow rate for a construction machine, the device being characterized by comprising: a variable capacity-type hydraulic pump and a pilot pump; an arm cylinder driven by operating oil supplied from the hydraulic pump; a variable arm regeneration valve installed in a passage between the arm cylinder and the operating oil tank; and an electronic proportional valve installed in a passage between the pilot pump and the arm regeneration valve.
    Type: Application
    Filed: January 27, 2014
    Publication date: January 19, 2017
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Tae-Rang Jung, Chun-Han Lee
  • Patent number: 9222488
    Abstract: A system and method for controlling engine revolutions for a hybrid construction machine, including an engine, a hydraulic pump which is driven by the engine to drive a hydraulic actuator with discharged hydraulic fluid, a motor-generator which is driven by the engine to generate electricity and to drive the hydraulic pump as a motor supplementing the engine, an energy storage device which is charged with electric energy generated by the motor-generator and which supplies the electric energy for motor operation of the motor-generator, a torque detection unit for detecting an output torque of the hydraulic pump that is required to drive the hydraulic actuator, and a hybrid control unit for controlling the motor operation of the motor-generator to supplement the engine output if the change of the output torque of the hydraulic pump exceeds a predetermined level and it is determined that an engine revolution drop will occur.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: December 29, 2015
    Assignee: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN AB
    Inventors: Jong Min Kang, Ahn Kyun Jung, Jae Hong Kim, Chun Han Lee, Jung Sun Jo
  • Publication number: 20150370254
    Abstract: Disclosed is a construction equipment driving control method for controlling machine driving without using an additional straight driving pedal.
    Type: Application
    Filed: February 8, 2013
    Publication date: December 24, 2015
    Inventor: Chun-Han LEE
  • Publication number: 20150354174
    Abstract: Disclosed is a method for controlling a driving speed of construction machinery for preventing a sudden change in the driving speed during a combined operation for operating a work device while driving an excavator. The method for controlling the driving speed of the construction machinery, according to one embodiment of the present invention, relates to the method for controlling the driving speed of the construction machinery comprising a lower driving body, a turning device for turning an upper turning body with respect to the lower driving body, a driving device, the work device, an electronic proportional valve for controlling the discharge flow rate of a hydraulic pump, and a controller.
    Type: Application
    Filed: January 23, 2013
    Publication date: December 10, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han LEE
  • Publication number: 20150322648
    Abstract: A flow control apparatus and a flow control method for a construction machine are disclosed, which can perform ground leveling work for smoothing the ground by the self weight of a boom without supplying hydraulic fluid from a hydraulic pump to a hydraulic cylinder.
    Type: Application
    Filed: January 24, 2013
    Publication date: November 12, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han LEE
  • Patent number: 9182312
    Abstract: The present invention relates to a control system for a hybrid excavator including an engine, a hydraulic pump driven by the engine to drive a hydraulic actuator by hydraulic fluid, a generator driven by the engine to generate electric energy, and an energy storage device charging the electric energy generated by the generator and supplying the electric energy to an electric actuator, the control system comprising: a required torque detection means for detecting a torque that is required to drive the hydraulic pump; a charge amount detection means for detecting a charge rate (or charge amount) of the electric energy storage device; a memory storing a generation degree (or generation amount) in accordance with the torque and the charge rate (or charge amount); and a hybrid control means for controlling the generator in accordance with the torque value detected by the required torque detection means and the generation amount in a memory means that corresponds to the charge rate value (or charge amount) detected
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: November 10, 2015
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Jae-Hong Kim, Chun-Han Lee
  • Patent number: 9145657
    Abstract: A grading control system using an excavator is disclosed, which determines and controls an operation amount of an attachment by combining an estimated pose of the attachment and an operator's operation signal of a joystick when a working mode for grading the ground is selected.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: September 29, 2015
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20150176251
    Abstract: A traveling control method for performing a smoothing work or the like through an operation of a working device during traveling is provided.
    Type: Application
    Filed: June 4, 2012
    Publication date: June 25, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20150134209
    Abstract: An apparatus for controlling bucket movement for automatically shaking off foreign substances is disclosed, which includes a bucket movement control unit controlling the bucket movement by determining whether to output an automatic control signal for automatically driving the bucket forward and backward at a predetermined speed even if an input value of a joystick is not changed or to output a manual control signal for driving the bucket according to an operation value of the joystick, in accordance with a selection/non-selection of an automatic mode by an automatic mode selection switch, an operation value detected by an operation value detection means, and an operation angle detected by an operation angle detection means, and outputting a corresponding signal to a bucket driving unit. The movement of the bucket can be automatically controlled so as to control the foreign substances contained in the bucket and to sprinkle earth and sand without any separate operation of an operator.
    Type: Application
    Filed: May 22, 2012
    Publication date: May 14, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Patent number: 9008919
    Abstract: A swing control apparatus and a swing control method for a construction machine are provided. The swing control apparatus includes a start position estimation unit, a stop target position calculation unit, and a swing motor position control unit. Even if an operator releases a lever or commands a stop at different times, an upper swing structure of the construction machine (for example, excavator) can be stopped within a predetermined range, and thus the inconvenience caused by an additional driving operation, which is required as the stop position differs according to the time point where the stop command starts, can be solved.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: April 14, 2015
    Assignee: Volvo Construction Equipment AB
    Inventors: Chun-Han Lee, Jin-Seop Kim
  • Patent number: 8909438
    Abstract: A swing control system for a hybrid construction machine includes a swing operation lever, a hydraulic pump, an electric swing motor that makes an upper swing structure swing against a lower driving structure in accordance with an electric control signal corresponding to an operation amount of the swing operation lever, a swing parking brake released in accordance with an operation signal of the swing operation lever to drive the swing motor, a control valve which drives a hydraulic cylinder for the swing parking brake by hydraulic fluid from the hydraulic pump to release the swing parking brake if the control valve is shifted by an input of the operation signal from the swing operation lever, and a controller that controls the swing parking brake through shifting of the control valve or controls driving of the swing motor in accordance with the operation signal from the swing operation lever.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: December 9, 2014
    Assignee: Volvo Construction Equipment AB
    Inventors: Chun-Han Lee, Ok-Jin Suk
  • Publication number: 20140244118
    Abstract: A grading control system using an excavator is disclosed, which determines and controls an operation amount of an attachment by combining an estimated pose of the attachment and an operator's operation signal of a joystick when a working mode for grading the ground is selected.
    Type: Application
    Filed: October 5, 2011
    Publication date: August 28, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20140174071
    Abstract: The present invention relates to a hydraulic control system for construction machinery capable of variably adjusting a set pressure of a relief valve, which controls a set pressure of a hydraulic system, according to a value inputted by means of pressure in the hydraulic system or the manipulation of a joystick.
    Type: Application
    Filed: August 9, 2011
    Publication date: June 26, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee
  • Publication number: 20140158235
    Abstract: A hydraulic control system for a construction machine is disclosed, which can operate an arm cylinder and a bucket cylinder by supplying hydraulic fluid from respective hydraulic pumps to the arm cylinder and the bucket cylinder during a combined operation, such as an excavating work, in which an arm joystick and a bucket joystick are simultaneously operated.
    Type: Application
    Filed: August 9, 2011
    Publication date: June 12, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Ok-Jin Suk, Chun-Han Lee
  • Publication number: 20140150416
    Abstract: Disclosed is an actuator damping control system for reducing shocks imparted to a hydraulic actuator caused by a change in load resulting from an abrupt manipulation of a boom or other working device.
    Type: Application
    Filed: July 12, 2011
    Publication date: June 5, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Chun-Han Lee