Patent ID: 8175776

Claim:
A system for controlling automatic leveling of heavy construction equipment with a lower frame and an upper frame, the lower frame having traveling means, and the upper frame tiltably and swingably connected to the lower frame, the system comprising: a sensor unit, provided in the equipment, including an inclination detecting sensor for measuring twist angles of the lower frame and the upper frame against a reference horizontal surface, a traveling detection sensor for measuring a traveling speed of the equipment, and a working device sensor for detecting working state information of a working device; a control unit for receiving the twist angles, the traveling speed, and the working state information, calculating a corrected angle at which the upper frame is to be tilted against the lower frame, and generating a control signal for instructing an operation of an actuator; and a driving unit for performing a leveling control through the actuator in accordance with the received control signal, wherein the control unit comprises: a receiving module for receiving from the sensor unit the twist angles of the lower frame and the upper frame, the traveling speed of the heavy construction equipment, and the working state information against a reference horizontal surface; a corrected angle calculation module for setting the twist angle of the upper frame as a first twist angle, and calculating the corrected angle from the first twist angle; a control signal generation module for generating the control signal in accordance with a period in which the actuator is to be operated, based on the corrected angle; an output module for transmitting the control signal to the driving unit; and a time limit module for counting the operation time at a start of the leveling control, and if the operation time exceeds a predetermined reference operation time, terminating the performing of the leveling control.