Evoked electromyography-based closed-loop torque control in functional electrical stimulation

Qin Zhang, Mitsuhiro Hayashibe, Christine Azevedo-Coste

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

This paper proposed a closed-loop torque control strategy of functional electrical stimulation (FES) with the aim of obtaining an accurate, safe, and robust FES system. Generally, FES control systems are faced with the challenge of how to deal with time-variant muscle dynamics due to physiological and biochemical factors (such as fatigue). The degraded muscle force needs to be compensated in order to ensure the accuracy of the motion restored by FES. Another challenge concerns the fact that implantable sensors are unavailable to feedback torque information for FES in humans. As FES-evoked electromyography (EMG) represents the activity of stimulated muscles, and also enables joint torque prediction as presented in our previous studies, here we propose an EMG-feedback predictive controller of FES to control joint torque adaptively. EMG feedback contributes to taking the activated muscle state in the FES torque control system into account. The nature of the predictive controller facilitates prediction of the muscle mechanical response and the system can therefore control joint torque from EMG feedback and also respond to time-variant muscle state changes. The control performance, fatigue compensation and aggressive control suppression capabilities of the proposed controller were evaluated and discussed through experimental and simulation studies.

Original languageEnglish
Article number6484109
Pages (from-to)2299-2307
Number of pages9
JournalIEEE Transactions on Biomedical Engineering
Volume60
Issue number8
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • EMG-feedback predictive control
  • evoked electromyography
  • functional electrical stimulation (FES)
  • joint torque control

ASJC Scopus subject areas

  • Biomedical Engineering

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