This technology is an active blade control leveling device where a position sensor is attached to the blade in front of the caterpillar-driven main body, and a drive speed sensor—using two sensing units protruding toward the outer shoe plates to measure the rotational speed of the drive member—is added, allowing a controller to adjust the blade height based on this information.
Ground leveling with bulldozers or wheel loaders has traditionally relied on skilled operators, as the results depend heavily on blade handling. If the blade bites too deep, the load increases and the equipment stalls; if it is too shallow, productivity drops. Previously, there were no effective means for equipment to autonomously detect these load changes and correct the blade height.
This technology calculates the load on the blade by comparing the actual travel speed obtained from the position sensor with the caterpillar rotational speed. It uses a closed-loop system to continuously raise the blade when the load exceeds a threshold and lower it when it is insufficient. The two sensing units are proximity sensors spaced at intervals along the shoe plate's path. Position and drive speed sensors are placed on both the left and right sides to adjust blade height independently, and the drive speed sensors are detachable for retrofitting. Applicable to large-scale earthworks, landfill and aggregate yard leveling, and site preparation, it prevents track slippage by detecting excessive soil resistance and lifting the blade, thereby reducing equipment strain and maintaining consistent excavation volume.
This invention was developed with support from the Ministry of Trade, Industry and Energy through a joint Korea-US research project on next-generation core robot technologies for disaster rescue and humanitarian aid.
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