Device for controlling construction equipment

Abstract

Provided is a device for controlling construction equipment for controlling the spool of an MCV, which is directionally controllable, to control working fluid which is supplied to a hydraulic actuator. According to the present invention, provided is a device for controlling construction equipment, comprising: a remote control valve for outputting a secondary signal pressure which is proportionate to the amount calibrated by an operator; a calibrated amount detection means for detecting the secondary signal pressure of the remote control valve; an electro proportional pressure reducing valve for outputting the secondary signal pressure; first and second shuttle valves, each of the shuttle valves having an input portion on one side which connects to the secondary signal pressure of the remote control valve, and an input portion on the other side to which output-side ports of the electro proportional pressure reducing valve connect respectively; a directional control spool for controlling the actuation of the hydraulic actuator when exchanging by means of the signal pressure output from the first and second shuttle valves; and a controller for outputting a control signal to the electro proportional pressure reducing valve so as to correspond to the operation amount which is input by the operation amount detection means.

1 . A control apparatus for a construction machine including an engine, a hydraulic pump connected to the engine, and a hydraulic actuator configured to receive a supply of hydraulic fluid from the hydraulic pump and configured to be capable of being directionally operated to drive a work apparatus, the control apparatus comprising:
 a remote control valve configured to output a secondary signal pressure in proportion to an operator's manipulation amount;   a manipulation amount detection means configured to detect the secondary signal pressure outputted from the output sides of the remote control valve;   an electro proportional pressure reducing valve configured to output a secondary signal pressure in proportion to an electric control signal from the outside;   first and second shuttle valves each having one input portion connected to a secondary signal pressure of the remote control valve and the other input portion connected to an output port of the electro proportional pressure reducing valve, the first and second shuttle valves being configured to output the higher signal pressure of signal pressures passing through the remote control valve and the electro proportional pressure reducing valve;   a directional control spool installed in a flow path provided between the hydraulic pump and the hydraulic actuator and configured to be shifted in response to the signal pressure output from the first and second shuttle valves to control a start, a stop, and a direction change of the hydraulic actuator; and   a controller configured to calculate a control signal that corresponds to the manipulation amount inputted thereto from the manipulation amount detection means, and configured to output the control signal for application to the electro proportional pressure reducing valve.   
     
     
         2 . The control apparatus for a construction machine according to  claim 1 , wherein the manipulation amount detection means comprises:
 a third shuttle valve having an input portion connected to a secondary signal pressure of the remote control valve, and configured to output the higher signal pressure of the directional signal pressures passing through the remote control valve; and   a pressure sensor connected to the output side of the third shuttle valve to apply a detection signal to the controller.   
     
     
         3 . The control apparatus for a construction machine according to  claim 1 , wherein the manipulation amount detection means comprises:
 a fourth shuttle valve having an input portion connected to a secondary signal pressure of the remote control valve and an output portion connected to an input port of the electro proportional pressure reducing valve, the fourth shuttle valve being configured to output the higher signal pressure of the directional signal pressures passing through the remote control valve; and   a pressure sensor connected to the output side of the fourth shuttle valve to apply a detection signal to the controller.