Position and cadence tracking of a motorized FES-cycle with an unknown time-varying input delay using saturated FES control
Open accessAbstract
Neurological conditions (NCs) can have debilitating effects on an individual and can impede a person’s ability to perform activities of daily living. A common rehabilitation for individuals with NCs is the use of functional electrical stimulation (FES) to induce muscle contractions to perform a functional task, such as cycling. In this paper, we develop a closed-loop FES cycling controller that yields exponential cadence tracking. Contributions of the work result from the design and analysis innovations to compensate for switching between the different muscles and motor control inputs, compensating for the inherent uncertain nonlinear dynamics, compensating for the time-varying unknown input delay resulting from the complex electrochemical FES muscle torque production process, and compensating for saturation in the evoked torque due to fatigue, available muscle mass, or stimulation sensitivity. The performance of the developed control system was examined through a series of experiments on nine participants (five able-bodied and four with NCs). The experiments resulted in a cadence tracking error of −0.03 ± 1.69 RPM for non-informed passive able-bodied participants and −0.04 ± 1.98 RPM for the participants with NCs, for a desired cadence of 50 RPM. © 2022 Elsevier Ltd. All rights reserved.
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Research works printed but not linked: 1
- Allen, B. C., Cousin, C., Rouse, C., & Dixon, W. E. (2019b). Cadence Tracking for Switched FES Cycling with Unknown Input Delay. In Proc. IEEE conf. decis. control (pp. 60–65). Nice, Fr. · DOI
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- Authors
- Allen, B. C., Stubbs, K. J., & Dixon, W. E.
- Affiliations
- Auburn University (US)
- University of Florida (US)
- Corresponding author
- Allen, Brendon C.
- Venue
- Automatica
- Publisher
- Elsevier BV
- Published
- 2022-05
- Volume
- 139
- Pages
- 110176
- ISSN
- 0005-1098 (ISSN-L)
- OpenAlex
- W4213452388
- Cited by
- 8
- References
- 41
- Citations by year
- 2026: 1 · 2024: 2 · 2023: 1 · 2022: 4
- FWCI
- 0.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (am, 298 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Automatica (acceptedVersion)
- Topics
- Physical Sciences › Engineering › Control and Systems Engineering › Adaptive Control of Nonlinear Systems
- Health Sciences › Medicine › Rehabilitation › Stroke Rehabilitation and Recovery
- Physical Sciences › Engineering › Control and Systems Engineering › Stability and Control of Uncertain Systems
- Keywords
- functional electrical stimulation, FES cycling, time-varying input delay, saturated control, neurological disorders, rehabilitation, muscle fatigue, exponential tracking, feedback control, nonlinear dynamics compensation
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