DEVICE FOR CONTROLLING CONTROL VALVE OF CONSTRUCTION MACHINE, METHOD FOR CONTROLLING SAME, AND METHOD FOR CONTROLLING DISCHARGE FLOW RATE OF HYDRAULIC PUMP

WIPO Patent Application WO/2014/208787

A1

Disclosed are a device for controlling a control valve of a construction machine, a method for controlling the same, and a method for controlling the discharge flow rate of a hydraulic pump, for the purpose of controlling the spool switching rate of a direction switching valve and the discharge flow rate of a hydraulic pump according to the temperature of operating oil in sub-zero temperatures of winter seasons. A device for controlling a control valve of a construction machine according to the present invention comprises: a variable capacity-type hydraulic pump; a hydraulic actuator driven by operating oil supplied from the hydraulic pump; a control valve installed on a channel between the hydraulic pump and the hydraulic actuator to control the activation, deactivation, and direction change of the hydraulic actuator during switching; a manipulation lever for outputting a manipulation signal so as to correspond to the amount of manipulation; a temperature sensor for detecting the temperature of operating oil in an operating oil tank connected to the hydraulic pump; and a controller for applying a control signal, which corresponds to the amount of manipulation of the manipulation lever, to the control valve when a signal from the temperature sensor confirms that the detected temperature of the operating oil is higher than a preset temperature, the controller adjusting a manipulation signal, which conforms to the amount of manipulation of the manipulation lever, by increasing the manipulation signal at a predetermined ratio so as to correspond to the detected temperature of the operating oil when a signal from the temperature sensor confirms that the detected temperature of the operating oil is lower than the preset temperature, and the controller applying the adjusted control signal to the control valve.

KIM JIN-WOOK (KR)
LEE SANG-HEE (KR)
SHIN HUNG-JU (KR)

PCT/KR2013/005656

December 31, 2014

June 26, 2013

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VOLVO CONSTR EQUIP AB (SE)
KIM JIN-WOOK (KR)
LEE SANG-HEE (KR)
SHIN HUNG-JU (KR)

E02F9/22; F15B13/02

KR20110054894A	2011-05-25
JP2003247504A	2003-09-05
KR950008533B1	1995-07-31
KR101032731B1	2011-05-06
KR20120026199A	2012-03-19

None
See also references of EP 3015609A4

YOON, Eui-Seoup (KR)
윤의섭 (KR)

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