CONTROL DEVICE FOR CONFLUENCE FLOW RATE OF WORKING DEVICE FOR CONSTRUCTION MACHINERY AND CONTROL METHOD THEREFOR

摘要

Disclosed are a control device for confluence flow rate of a working device and a control method therefor, the control device being capable of minutely operating a working device when a flow rate supplied to the working device is merged or blocked. Provided is a control device for confluence flow rate of a working device for construction machinery according to the present invention, the control device comprising: first and second hydraulic pumps and a pilot pump; first and second hydraulic operating levers; first and second working devices operated by operating oil supplied from the first and second hydraulic pumps; a control valve for the first working device, installed on a supply path between the first hydraulic pump and the first working device; a control valve for the second working device, installed on a supply path between the second hydraulic pump and the second working device; a confluence valve installed on the supply path upstream of the control valve for the second working device; a first proportional control valve installed in a pilot line between the pilot pump and the confluence valve; and a controller for calculating, as electrical signals, pilot pressures applied to the control valves for first and second working devices in proportion to the operation amount of the first and second hydraulic operating levers and thus applying the operated electrical signal to the first proportional control valve.