Title:
DEVICE AND METHOD FOR CONTROLLING FLOW RATE IN CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2014/115907
Kind Code:
A1
Abstract:
Disclosed are a device and a method for controlling a flow rate in construction machinery for stationery work for evenly leveling the ground by means of the weight of a boom, without supplying working oil to a hydraulic cylinder from a hydraulic pump. The method for controlling the flow rate in the construction machinery, according to the present invention, relates to the method for controlling the flow rate in the construction machinery comprising a hydraulic pump, a hydraulic actuator connected to the hydraulic pump, a control valve for controlling the direction of flow of the working oil supplied to the hydraulic actuator, a floating valve installed on a flow path between the control valve and the hydraulic actuator and switching between a regular work mode and a floating mode, a detection means for detecting the operation amount of a boom-down operation lever operated by a user, an electronic proportional valve for controlling a discharge flow rate of the hydraulic pump, and a controller. The method comprises: a first step of determining whether the floating valve is switched to the floating mode; a second step of modifying the discharge flow rate of the hydraulic pump according to the amount of the boom-down operation detected by the detection means, when the floating valve is switched to the floating mode; and a third step of outputting an electric control signal to the electronic proportional valve so that the working oil can be discharged from the hydraulic pump at the flow rate modified according to the amount of the boom-down operation.
Inventors:
LEE CHUN-HAN (KR)
Application Number:
PCT/KR2013/000546
Publication Date:
July 31, 2014
Filing Date:
January 24, 2013
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
LEE CHUN-HAN (KR)
LEE CHUN-HAN (KR)
International Classes:
F15B13/044; E02F9/22; F15B21/08
Foreign References:
| JPH07259806A | 1995-10-09 | |||
| US20100313557A1 | 2010-12-16 | |||
| US5331882A | 1994-07-26 | |||
| JP2004301214A | 2004-10-28 | |||
| JP2001124011A | 2001-05-08 |
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
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