We have proposed a leg-wheel hybrid mobile robot named "Roller-Walker". Roller-Walker is a vehicle with a special foot mechanism, which changes to a sole in walking mode and a passive wheel in skating mode. On rugged terrain the vehicle walks in leg mode, and on level or comparatively smooth terrain the vehicle makes wheeled locomotion by roller-skating using the passive wheels. The characteristics of Roller-Walker are: (1) it has a hybrid function but is lightweight, (2) it has the potential capability to exhibit high terrain adaptability in skating mode if the control method for roller-walking is fully investigated in the future. In the paper, the 4 leg trajectory of straight roller-walk is optimized in order to achieve maximum constant velocity. Also a steering roller-walk control method is proposed. It is obtained by the expansion of the straight roller-walk trajectory theory adding an offset to the swinging motion. This steering method resembles that of a car. The control system was modified into an untethered system, and control experiments were performed. The realization of the steering motion was verified by them.
[1]
H. S. Cho,et al.
Development of a mobile robot controlled by three motors for hostile environment
,
1991
.
[2]
Tatsuo Arai,et al.
Study on Underground Space Excavating Machine
,
1992
.
[3]
S. Hirose,et al.
Development of quadruped walking robot TITAN-VIII
,
1996,
Proceedings of IEEE/RSJ International Conference on Intelligent Robots and Systems. IROS '96.
[4]
S. Hirose,et al.
Study on Roller-Walk (basic characteristics and its control)
,
1996,
Proceedings of IEEE International Conference on Robotics and Automation.
[5]
S. Hirose,et al.
Study on Roller-Walker (system integration and basic experiments)
,
1999,
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C).