Method for compensating for flow rate of hydraulic pump of construction machine

A method for compensating a discharge flow rate of a hydraulic pump for a construction machine, the construction machine including

• a hydraulic pump connected to an engine;
• a hydraulic actuator that drives the working device by operating hydraulic fluid;
• a control valve installed in a flow path of the hydraulic pump;
• an operation lever outputting a signal pressure corresponding to an operation amount;
• means for detecting the operation amount of the operation lever;
• means for detecting an engine rpm;
• and
• a controller for controlling the control valve in response to the signal pressure corresponding to the operation amount and a detected signal corresponding to an engine rpm, the method comprising;
• detecting the signal pressure corresponding to the operation amount of the operation lever, and the engine rpm;
• determining a required discharge volume corresponding to the operation amount of the operation lever and a compensation ratio, and
• determining a required discharge volume that compensates for the engine rpm, and
• controlling a discharge flow rate of the hydraulic pump,
• wherein the controlling step includes controlling the hydraulic pump so that the discharge flow rate derived from a sum of a required volume corresponding to the operation amount of the operation lever and a calculated volume that is obtained by multiplying a percentile compensation ratio by a difference value between the required volume corresponding to the operation amount of the operation lever and the required volume that compensates for the engine rpm.