Patent ID: 8145392

Claim:
A system for controlling automatic leveling of construction equipment with a lower frame, an upper frame, and tilting means, the lower frame having traveling means, the upper frame tiltably and swingably connected to the lower frame, and the tilting means being for tiltably connecting the upper frame to the lower frame, the system comprising: a sensor unit, provided in the equipment, for sensing twist angles of the lower frame and the upper frame against a reference horizontal surface and a traveling speed of the equipment; a control unit for receiving the twist angles and the traveling speed, setting a limit of an operation time for an automatic leveling in a standstill state of the equipment while calculating a corrected angle to which a twist angle of the upper frame is to be corrected, without setting the limit of the operation time for the automatic leveling, in a traveling state of the equipment, and generating a control signal for instructing an operation of the tilting means for controlling the corrected angle; and a driving unit for performing a tilting control through the tilting means for controlling the received control signal, wherein the control unit comprises: a receiving module for receiving a signal from the sensor unit sensing the twist angles of the lower frame and the upper frame against a reference horizontal surface, and the traveling speed of the lower frame; a corrected angle calculation module for setting the twist angle of the upper frame in comparison to a first twist angle, and calculating the corrected angle from the first twist angle; a control signal generation module for judging whether to perform a leveling control by calculating the twist angle of the upper frame on the basis of an expanded surface of the lower frame as a second twist angle, and generating the control signal in accordance with a period in which the actuator is to be operated, based on the corrected angle; and an output module for transmitting the control signal to the driving unit.