Title:
ELECTROHYDRAULIC CONTROL DEVICE FOR CONSTRUCTION MACHINE AND METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/177279
Kind Code:
A1
Abstract:
An electrohydraulic control device for a construction machine comprises: a control valve, installed in a hydraulic line between a hydraulic pump and an actuator, for controlling an operation of the actuator according to the amount of displacement of a spool provided therein; a spool displacement adjusting valve for outputting a secondary pressure proportional to an input pressure command signal to a spool of the control valve to control the amount of displacement of the spool of the control valve; a pressure sensor for detecting the secondary pressure output from the spool displacement adjusting valve; and a control unit for outputting a pressure command signal to the spool displacement adjusting valve in accordance with an operation signal of the construction machine and correcting the pressure command signal when the pressure difference between the detected secondary pressure and a predetermined design pressure by the pressure command signal deviates from a predetermined allowable range.
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Inventors:
KIM TAEYOON (KR)
JANG GYEBONG (KR)
JANG GYEBONG (KR)
Application Number:
PCT/KR2019/002183
Publication Date:
September 19, 2019
Filing Date:
February 22, 2019
Export Citation:
Assignee:
DOOSAN INFRACORE CO LTD (KR)
International Classes:
E02F9/22; F15B21/08
Foreign References:
| KR20100024737A | 2010-03-08 | |||
| JP2000265498A | 2000-09-26 | |||
| KR20160087539A | 2016-07-22 | |||
| JP2016142285A | 2016-08-08 | |||
| JP2015166516A | 2015-09-24 |
Attorney, Agent or Firm:
PARK, Pil-jin et al. (KR)
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