(19)
(11)EP 3 305 994 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
13.06.2018 Bulletin 2018/24

(43)Date of publication A2:
11.04.2018 Bulletin 2018/15

(21)Application number: 17194790.6

(22)Date of filing:  04.10.2017
(51)International Patent Classification (IPC): 
E02F 9/20(2006.01)
E02F 9/22(2006.01)
G05B 13/02(2006.01)
B66F 9/22(2006.01)
F15B 11/044(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30)Priority: 04.10.2016 KR 20160127409

(71)Applicant: Doosan Infracore Co., Ltd.
Incheon 22502 (KR)

(72)Inventors:
  • KIM, Ki-Yong
    Seoul 06216 (KR)
  • AHN, Hyeon-Sik
    Seoul 05555 (KR)
  • JUNG, Woo-Yong
    Seoul 08090 (KR)
  • KIM, Chang-Mook
    Gyeonggi-do 13128 (KR)

(74)Representative: Isarpatent 
Patent- und Rechtsanwälte Behnisch Barth Charles Hassa Peckmann & Partner mbB Friedrichstrasse 31
80801 München
80801 München (DE)

  


(54)CONTROL SYSTEM FOR CONSTRUCTION MACHINERY AND CONTROL METHOD FOR CONSTRUCTION MACHINERY


(57) A control system for construction machinery includes a first hydraulic pump (100), first and second actuators (20) connected to the first hydraulic pump through first and second hydraulic lines (220,222) respectively and operable by a working oil discharged from the first hydraulic pump, first and second control valves (320,322) installed in the first and second hydraulic lines respectively and configured to control operations of the first and second actuators, a first spool displacement adjusting valve (420) supplying a pilot signal pressure to a spool of the first control valve (320) in proportion to an inputted control signal to control a displacement amount of the spool of the first control valve, and a controller (500) configured to output the control signal to the first spool displacement adjusting valve (420) corresponding to a manipulation signal (600) of an operator, and configured to adjust a spool displacement amount of the first control valve (320) according to an amount of the working oil to be supplied to the first actuator (20) when the first actuator performs a single or multiple operation by self-load.







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