Automatic grading system for construction machine and method for controlling the same

摘要

The present invention relates to an automatic grading system for a construction machine, including: a work apparatus having a boom connected pivotally to one side of a vehicle body, an arm connected pivotally to a front end portion of the boom, and a bucket connected pivotally to a front end portion of the arm; a boom angle detection sensor mounted on one side of the boom; an arm angle detection sensor mounted on one side of the arm; a switch panel on which a standard grading mode switch, a grading history storage switch, and a history grading mode switch selected for a grading work are disposed; an electronic control unit adapted to receive grade input signals applied from the angle detection sensors at the time when the grading mode switches and a joystick for controlling the work apparatus are manipulated and to calculate the grade input signals in accordance with a predetermined control algorithm.

主权项

1. An automatic grading system for a construction machine, comprising:
a work apparatus having a boom connected pivotally to one side of a vehicle body, an arm connected pivotally to a front end portion of the boom, and a bucket connected pivotally to a front end portion of the arm; a boom angle detection sensor mounted on one side of the boom so as to sense the angular movement of the boom with respect to the vehicle body; an arm angle detection sensor mounted on one side of the arm so as to sense the angular movement of the arm with respect to the boom; a switch panel on which a standard grading mode switch, a grading history storage switch, and a history grading mode switch selected for a grading work are disposed; an electronic control unit adapted to receive grade input signals applied from the angle detection sensors at the time when the grading mode switches and a joystick for controlling the work apparatus are manipulated and to calculate the grade input signals in accordance with a predetermined control algorithm to output grade control signals for controlling the angular movements of the boom, arm and bucket, so that the angular movement of the bucket is fixed to a given starting angle from an initial grading position to a final grading position and the angular movements of the boom and arm are determined as variable angles to maintain the given starting angle; and work apparatus control valves adapted to control the hydraulic pressures for driving a boom cylinder, an arm cylinder and a bucket cylinder in response to the grade control signals; and a swing angle detection sensor mounted on one side of the vehicle body; wherein: when the standard grading mode switch is turned on, the boom, arm, and bucket are moved to an initial grading area and the angular movement of the bucket is fixed to a given starting angle; and when the history grading mode switch is manipulated, the grade control signals determined by the angular movements of the boom, arm, and bucket within the initial grading area from the initial grading position to the final grading position are recorded as grading history data in the electronic control unit, and through the grading history data the work apparatus is repeatedly operated in a continuous grading area from the initial grading area.