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: 20130268166
    Abstract: An engine idling control device for an excavator and a method thereof are provided, which can recognize the state of an engine, an on/off state of a function selection switch, and a user's intention to work that has maximally been reflected, reduce fuel use and production of carbon dioxide through automatic stopping or driving of the engine in accordance with an operation state of a safety device having convenience, and easily implement an engine stop and start function in accordance with a user's selection. The engine idling control device includes a first signal detection unit, a second signal detection unit, and an engine idling control unit automatically stopping or driving an engine in accordance with the state of the engine, the on/off state of the function selection switch detected by the first signal detection unit, and the operation state of the safety device detected by the second signal detection unit.
    Type: Application
    Filed: December 16, 2010
    Publication date: October 10, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Eui-Chul Kim, Chun-Han Lee
  • Publication number: 20130245899
    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: Application
    Filed: December 7, 2010
    Publication date: September 19, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Chun-Han Lee, Ok-Jin Suk
  • Publication number: 20130116897
    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: Application
    Filed: July 13, 2010
    Publication date: May 9, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Chun-Han Lee, Jin-Seop Kim
  • Publication number: 20130103272
    Abstract: Disclosed are a horsepower control system for a hybrid excavator and a control method thereof which controls the driving of a generator driver or a swing motor driver with a swing power ratio of 1 and a hydraulic power ratio of 1 in a first operation mode, and with a swing power ratio of r (a user set value) and a hydraulic power ratio of 1?r in a second operation mode. When the power required by the user is fully used, energy from an energy storage is used to maximize work capacity. When the total horsepower used is limited to the range of horsepower available, the limited use of the driving device is at a level of horsepower similar to that of a typical system, thereby minimizing fuel consumption.
    Type: Application
    Filed: July 6, 2010
    Publication date: April 25, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Chun-Han Lee, Jin-Seop Kim
  • Publication number: 20130090771
    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: Application
    Filed: June 28, 2010
    Publication date: April 11, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Jae-Hong Kim, Chun-Han Lee
  • Publication number: 20130063893
    Abstract: A discharge system of a stored energy for a construction machine is provided, which includes the energy storage, an electric discharge device discharging energy stored in the energy storage, and an energy cooling portion increasing the heat dissipation capacity of the electric discharge device by cooling heat generated in the electric discharge device for a time when the energy stored in the energy storage is discharged to the electric discharge device. Since the heat generated in the electric discharge device is cooled by a cooling device while the energy stored in the energy storage is discharged to the electric discharge device, the heat dissipation capacity of the electric discharge device is increased to shorten the discharge time. Also, the operation period of the cooling device is controlled in proportion to the residual voltage of the energy storage, and thus the cooling efficiency is maximized.
    Type: Application
    Filed: September 6, 2010
    Publication date: March 14, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Chun-Han Lee, Dong-Uk Choi
  • Patent number: 8340874
    Abstract: Construction equipment including a hydraulic pump driven by an engine, a lower driving structure, an upper swing structure swingably mounted on the lower driving structure, a working device mounted on the upper swing structure and having a boom, an arm, and a bucket respectively driven by a hydraulic cylinder is disclosed. The construction equipment comprises a rear view camera to permit a driver to view rearward traffic conditions.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: December 25, 2012
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Chun Han Lee
  • Patent number: 8104564
    Abstract: An antitheft system and method for construction equipment is disclosed. The antitheft system and method can prevent the construction equipment from driving if a driver gets out of a cabin in the state in which an ignition is turned on so as to preheat a heater or engine or in a case where a driving unit is not manipulated during a predetermined period.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: January 31, 2012
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Chun Han Lee
  • Publication number: 20110154815
    Abstract: A swing motor control method in an open center type hydraulic system for a hydraulic excavator is provided, which can adjust the speed of a swing motor so that a swing device and a working device harmonize with each other according to a discharge pressure of a hydraulic pump during a multifunctional work of the working device and the swing device.
    Type: Application
    Filed: December 30, 2010
    Publication date: June 30, 2011
    Inventor: Chun Han LEE
  • Publication number: 20110028268
    Abstract: A system and method for controlling engine revolutions for a hybrid construction machine is provided.
    Type: Application
    Filed: June 21, 2010
    Publication date: February 3, 2011
    Inventors: Jong Min KANG, Ahn Kyun JUNG, Jae Hong KIM, Chun Han LEE, Jung Sun JO
  • Patent number: 7845967
    Abstract: A USB storage device includes a casing, a USB module and a protecting cover. The USB module is disposed in the casing and comprises a plurality of protruding pins. Each of the protruding pins has a first height. The protecting cover is connected to the casing and selectively covers the USB module. The protecting cover has a surface and an accommodating space formed on the surface. When the protecting cover completely covers the USB module, the protruding pins are accommodated in the accommodating space. A second height is defined between a bottom of the accommodating space and the surface. The second height is larger than the first height of the protruding pin.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: December 7, 2010
    Assignee: Transcend Information, Inc.
    Inventors: Chung-Won Shu, Chih-Heng Chiu, Fang-Yi Lin, Chia-Hao Hsu, Yu-Hsiu Huang, Chun-Han Lee
  • Publication number: 20100199730
    Abstract: An antitheft system and method for construction equipment is disclosed. The antitheft system and method can prevent the construction equipment from driving if a driver gets out of a cabin in the state in which an ignition is turned on so as to preheat a heater or engine or in a case where a driving unit is not manipulated during a predetermined period.
    Type: Application
    Filed: February 9, 2010
    Publication date: August 12, 2010
    Inventor: Chun Han Lee
  • Publication number: 20100204873
    Abstract: Construction equipment including a hydraulic pump driven by an engine, a lower driving structure, an upper swing structure swingably mounted on the lower driving structure, a working device mounted on the upper swing structure and having a boom, an arm, and a bucket respectively driven by a hydraulic cylinder is disclosed. The construction equipment comprises a rear view camera to permit a driver to view rearward traffic conditions.
    Type: Application
    Filed: February 9, 2010
    Publication date: August 12, 2010
    Inventor: Chun Han Lee