Blade control system and construction machine
AssigneeKomatsu Ltd.
InventorsKazuhiko HAYASHI, Kenjiro Shimada, Kenji Okamoto
Life of this patent
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Abstract
A blade control system of the present invention includes an angle obtaining part, an open ratio setting part and a lift cylinder controlling part. The angle obtaining part is configured to obtain an angle of a lift frame with respect to a designed surface. The open ratio setting part is configured to set an open ratio based on the angle. The lift cylinder controlling part is configured to open a proportional control valve at the open ratio for elevating the blade when a distance between the designed surface and an edge of a blade is determined to be less than or equal to a threshold.
Claims9
A blade control system, comprising:
- a lift frame vertically pivotably attached to a vehicle body;
- a blade supported by a tip of the lift frame;
- a lift cylinder configured to vertically pivot the lift frame;
- a proportional control valve connected to the lift cylinder;
- an angle obtaining part configured to obtain an angle of the lift frame with respect to a designed surface in a side view of the vehicle body, the designed surface formed as a three dimensionally designed landform indicating a target contour of an object for dozing;
- an open ratio setting part configured to set an open ratio of the proportional control valve based on the angle;
- a distance calculating part configured to calculate a distance between the designed surface and a cutting edge of the blade;
- a determining part configured to determine whether or not the distance between the designed surface and the cutting edge of the blade is less than or equal to a threshold;
- and
- a lift cylinder controlling part configured to open the proportional control valve at the open ratio set by the open ratio setting part for elevating the blade when the determining part determines that the distance between the designed surface and the cutting edge of the blade is less than or equal to the threshold.
Dependencies are inferred from the claim text.