A Multi-Task Mode Control Method for Powered Knee-Ankle Prosthesis

Fang Peng, Tao Hu, Cheng Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Finite-state impedance control has been widely used in powered lower limb prosthesis. However, this method divides a certain gait into multiple phases, and each phase requires tuning some parameters through a large number of subject experiments. It is necessary to develop an effective unified controller for each gait, which can switch easily between different task modes. In this paper, a unified controller based on virtual constraint is designed for powered ankle-knee prosthesis, and a multi-Task control method that is capable of switching different locomotion modes is developed. To achieve multi-Task control, we first designed a stair ascent controller based on a piecewise phase variable utilizing the periodicity of the hip angle. The controller divides the gait into five phases, and the phase transition only changes the calculation formula of the phase variable without changing the controller parameters so that uniform control of the different phases can be achieved. Secondly, we proposed a supervisory method to switch between the level walking and stair ascent task modes. Simulation results confirmed that the unified controller of the gait can stably control the prosthesis at different speeds and the supervisory method can realize the transition of multiple motion gaits.

Original languageEnglish
Title of host publicationProceedings - 2019 International Conference on Advanced Mechatronic Systems, ICAMechS 2019
PublisherIEEE Computer Society
Pages338-343
Number of pages6
ISBN (Electronic)9781728134802
DOIs
Publication statusPublished - 2019 Aug
Event2019 International Conference on Advanced Mechatronic Systems, ICAMechS 2019 - Kusatsu, Shiga, Japan
Duration: 2019 Aug 262019 Aug 28

Publication series

NameInternational Conference on Advanced Mechatronic Systems, ICAMechS
Volume2019-August
ISSN (Print)2325-0682
ISSN (Electronic)2325-0690

Conference

Conference2019 International Conference on Advanced Mechatronic Systems, ICAMechS 2019
CountryJapan
CityKusatsu, Shiga
Period19/8/2619/8/28

Keywords

  • multi-Task
  • phase variable
  • prosthesis
  • stair ascent

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

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  • Cite this

    Peng, F., Hu, T., & Zhang, C. (2019). A Multi-Task Mode Control Method for Powered Knee-Ankle Prosthesis. In Proceedings - 2019 International Conference on Advanced Mechatronic Systems, ICAMechS 2019 (pp. 338-343). [8861687] (International Conference on Advanced Mechatronic Systems, ICAMechS; Vol. 2019-August). IEEE Computer Society. https://doi.org/10.1109/ICAMechS.2019.8861687