High path tracking control of an intelligent walking-support robot under time-varying friction and unknown parameters

Yina Wang, Shuoyu Wang, Kenji Ishida, Yo Kobayashi, Masakatsu G. Fujie, Takeshi Ando

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Walking is the most fundamental requirement for independent living in daily life. An intelligent walking-support robot has been developed for use by people with walking disabilities. To appropriately assist the user, the robot must precisely track the user’s intentions. However, the robot’s tracking accuracy is severely compromised by time-varying friction, center-of-gravity (CoG) shifts, and load changes induced by the user. In a previous study, we proposed a digital acceleration controller with online inertial parameter identification. However, the tracking accuracy was still affected by CoG shifts introduced by the users. To address these issues, the current study investigated a novel dynamic model, wherein all the load and CoG information processed in the inertial matrix was derived and a new digital acceleration controller with parameter estimation was used to compensate for the time-varying friction, CoG shifts, and load changes. Experiments were conducted under different floor and load conditions to demonstrate the improved tracking accuracy of the proposed control method.

Original languageEnglish
Pages (from-to)739-752
Number of pages14
JournalAdvanced Robotics
Volume31
Issue number14
DOIs
Publication statusPublished - 2017 Jul 18

Keywords

  • center-of-gravity shifts
  • load changes
  • parameter estimation
  • time-varying friction
  • Walking-support robot

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Human-Computer Interaction
  • Hardware and Architecture
  • Computer Science Applications

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