Abstract
To promote the rehabilitation training occupied at home, in this article, a wheelchair-exoskeleton system combining the lower extremity exoskeleton (LEE) and the mobile wheelchair is developed to help users to complete the activities of daily life. A hierarchical control architecture is designed and developed for the wheelchair-exoskeleton system. The control architecture is composed of three layers: (1) the top layer is achieved by the task-based voice-controlled strategy through voice recognition; (2) the decision layer produces the intent actions based on the output of the top layer; (3) the execution layer is in charge of controlling the movement of the system, including the gait tracking control of LEE as well as the coordination control of the mobile wheelchair. The mobile wheelchair as a partner works in coordination with the LEE by positioning techniques through utilizing ultra-wideband (UWB) sensors. A small validation study with three able-bodied subjects performing the whole usage process is presented. The experimental results demonstrate that the developed wheelchair-exoskeleton system has the potential to be applied to in-home care with long endurance.
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Funding
This work was supported by the Fundamental Research Funds for the Central Universities (N2129002) and Natural Science Foundation of Guangdong Province (2020A1515110121).
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Yi Long conceived and designed the study. Yajun Peng performed the experiments. Yi Long written, reviewed and edited the manuscript. All authors read and approved the manuscript.
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Appendix
Appendix
Notation: a, b, d, kl and kr are predefined positive parameters, Wl and Wr are the control variables for the left wheel and the right wheel respectively. The other action, e.g., “wheelchair come”, does not judge whether the L3 is bigger or smaller than the defined distance d.
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Long, Y., Peng, Y. Development and Validation of a Robotic System Combining Mobile Wheelchair and Lower Extremity Exoskeleton. J Intell Robot Syst 104, 5 (2022). https://doi.org/10.1007/s10846-021-01550-8
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DOI: https://doi.org/10.1007/s10846-021-01550-8