Development and Hybrid Control of an Electrically Actuated Lower Limb Exoskeleton for Motion Assistance

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ID: 275881
2019
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Abstract
This paper describes a system design and hybrid control algorithm of an electrically actuated lower limb exoskeleton (LLE). The system design mainly includes three parts: mechanical structure design, actuation system design and sensor system design. According to the initial state of the joint angle, LLE can be divided into Non-anthropomorphic state (NAS) and anthropomorphic state (AS). The human motion intention (HMI) estimation can be divided into gait phase classification and reference trajectory estimation. The fuzzy logic is used to detect different phases in the gait phase classification. In the reference trajectory estimation, the kinematic model of the LLE is utilized to obtain a continuous joint trajectory, which is used as input of the control law. To make the LLE accurately follow the movement of people and remain stable, a hybrid dual-mode control strategy is proposed in this paper, i.e., the adaptive impedance control (AIC) method is used to improve the stability and resistance to shock in stance phase, and the active disturbance rejection control with the fast terminal sliding mode control (ADRC-FTSMC) method is employed to improve the response speed and the tracking precision in swing phase. Furthermore, in order to solve the torque discontinuity in the switching process, a smoothing method is proposed during the transition. Finally, the prototype experiments were set up to verify the tracking performance and power-assisted effect of the proposed exoskeleton. The experiments results show the LLE can achieve excellent tracking performance and power-assisted effect based on the proposed HMI methodology and hybrid dual-mode control strategy.
Reference Key
chen2019developmentieee Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Chen, Chao-Feng;Du, Zhi-Jiang;He, Long;Shi, Yong-Jun;Wang, Jia-Qi;Xu, Guo-Qiang;Zhang, Yu;Wu, Dong-Mei;Dong, Wei;
Journal ieee access
Year 2019
DOI
DOI not found
URL
https://ieeexplore.ieee.org/document/8897544/
Keywords
microscopy Medicine (General) Engineering (General). Civil engineering (General) Technology Electrical engineering. Electronics. Nuclear engineering Descriptive and experimental mechanics neoplasms. tumors. oncology. including cancer and carcinogens ophthalmology diseases of the genitourinary system. urology

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