System for controlling land leveling work which uses an excavator

The present invention discloses a system for controlling land leveling work which combines the estimated orientation of a piece of heavy equipment with the signal from a joystick manipulated by the driver to determine and control the control input of the piece of heavy equipment when the land leveling operation mode is selected. According to the present invention the system for controlling land leveling work includes: an actuator connected to an oil hydraulic pump; a piece of heavy equipment driven by the actuator; a control valve driving the actuator when switched; an electrical joystick; a pressure detection unit; an operation mode setting unit; and a controller. The method for controlling the system for controlling land leveling work includes the steps of: receiving the value of the signal from the manipulation of a joystick and the value of the pressure of an arm cylinder, and determining whether an operation mode is set; calculating the external force applied to a piece of heavy equipment by the pressure generated in the arm cylinder when the land leveling operation mode is selected; estimating the orientation of the arm using the calculated value of the external force; filtering the orientation of the arm to process the signal; and combining the estimated orientation of the arm with the value of the control signal from the manipulation of a joystick by the driver to calculate the control input of a boom and arm and to proceed to an earlier stage. Hereon, the above described steps may be repeatedly performed.