Approach Path Generation to Scooping Position for Wheel Loader

Our group developed a method of path generation for wheel loaders as part of our ongoing research on the autonomous loading operation of wheel loaders at surface mines and construction sites. The path connecting the present vehicle position and scooping position consists of clothoid curves and straight lines. Each line segment is optimized in a path generation procedure. A simplified model of the pile shape and bucket trajectory is used to determine the scooping direction based on an estimation of the resistance force applied on the bucket during the scooping motion. We applied the proposed method in an experimental model. A stereo-vision system was used to measure the shape of the pile and the scooping direction that imposed the least moment on the bucket was selected as the scooping position. This method generates an appropriate path for the wheel loader.

[1]  Masaki Mori,et al.  Automatic Wheel-Loader in Asphalt Plant , 1992 .

[2]  Shigeru Sarata.  Model-based task planning for loading operation in mining , 2001, Proceedings 2001 IEEE/RSJ International Conference on Intelligent Robots and Systems. Expanding the Societal Role of Robotics in the the Next Millennium (Cat. No.01CH37180).

[3]  Hisashi Osumi,et al.  Trajectory arrangement based on resistance force and shape of pile at scooping motion , 2004, IEEE International Conference on Robotics and Automation, 2004. Proceedings. ICRA '04. 2004.

[4]  S. Yuta,et al.  Path generation for articulated steering type vehicle using symmetrical clothoid , 2002, 2002 IEEE International Conference on Industrial Technology, 2002. IEEE ICIT '02..