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Proportional EMG control for upper-limb powered exoskeletons
T Lenzi1, S M M De Rossi, N Vitiello
1The BioRobotics Institute, Scuola Superiore Sant’Anna, viale Rinaldo Piaggio 34, 56025 Pontedera, PI, Italy. t.lenzi@sssup.it
This study shows that simple, low-accuracy electromyography (EMG) control can effectively assist elbow exoskeleton movements. Users quickly adapt, reducing their effort while maintaining full control.
Area of Science:
- Biomedical Engineering
- Rehabilitation Robotics
- Human-Machine Interfaces
Background:
- Electromyography (EMG) is often proposed for controlling powered exoskeletons.
- Significant research focuses on accurate muscular torque estimation for exoskeleton control.
Purpose of the Study:
- To investigate the necessity of precise torque estimation for effective exoskeleton assistance.
- To evaluate the efficacy of a low-accuracy EMG-proportional control for elbow exoskeleton assistance.
Main Methods:
- Utilized a simple EMG-proportional control strategy for torque estimation.
- Implemented an elbow exoskeleton to provide movement assistance.
- Assessed user adaptation and control during assisted movements.
Main Results:
- Subjects demonstrated rapid adaptation to the exoskeleton's assistance.
- Users were able to reduce their muscular effort.
- Full control of movement was maintained despite simplified torque estimation.
Conclusions:
- Accurate torque estimation may not be essential for effective powered exoskeleton assistance.
- Simple EMG-based control strategies can enable intuitive and effective human-exoskeleton interaction.
- Further research can explore simplified control for broader exoskeleton applications.
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