ELECTROHYDRAULIC CONTROL DEVICE FOR CONSTRUCTION MACHINE AND METHOD THEREOF

• Main Authors: KIM TAEYOON, JANG GYEBONG
• Format: Patent
• Language: Chinese; English
• Published: 27.10.2020
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

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 toa 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. 本发明的工程机械的电子液压式控制装置包括