Manual leveling control system and method for construction equipment

A manual leveling control method for construction equipment having a tilting unit that is coupled between a lower frame having a traveling means and an upper swing frame having a cab and is so operated by actuators as to tilt the upper swing frame, wherein the upper swing frame swivels against the tilting unit, the manual leveling control method comprising:

• (A) receiving a tilting manipulation signal corresponding to position coordinate values generated in accordance with a manipulation of a tilting manipulation input device, and calculating a coordinate angle and a coordinate distance or size from an original point to a coordinate point on a coordinate system having coordinate axes corresponding to left/right direction and front/rear direction of the upper swing frame;
• (B) calculating a compensation axis angle from the coordinate angle and the swing angle of the upper swing frame, wherein the compensation axis angle indicates in plane view an angle between a reference axis of the reference surface and a tilting compensation axis on a horizontal surface of the upper swing frame, wherein the tilting compensation axis forms a tilting angle to be compensated between the reference surface and the horizontal surface of the upper swing frame;
• and
• (C) calculating an operation value for determining whether to extend/contract an actuator and an operation range of the actuator, which is determined as target actuators to be operated among actuators radially positioned around the center of the tilting unit, from the coordinate distance or size and the compensation axis angle, in order to tilt the upper swing frame against the reference surface in accordance with the tilting manipulation signal.