Transparent mode for lower limb exoskeleton

R. Mendoza-Crespo*, R. Soto, Jose L Pons

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Scopus citations


In this paper a method to reduce the mechanical impedance of the joints of a lower limb exoskeleton is presented. When user is in charge of the motion the exoskeleton mimic its movements. Gravity, Friction and Interaction Force compensators are designed in order to reduce the force necessary to move the exoskeleton joints. Gravity compensation is used to mitigate the effect of the exoskeleton’s weight. This weight adds a force component when the orientation of the limb is different to the gravity vector. The added Friction compensation effect reduces the frictional phenomena of the joints gearboxes. The Interaction Force is calculated from the measured strain of the segments of the exoskeleton. User intention is also detected using the Interaction Force. The gain block adjusts the weights of the friction and interaction compensators depending on the joint velocity. First in this work the context is shown. Followed by the experimental set-up, several compensators and its effects and the control algorithm.

Original languageEnglish (US)
Title of host publicationBiosystems and Biorobotics
PublisherSpringer International Publishing
Number of pages5
StatePublished - Jan 1 2017

Publication series

NameBiosystems and Biorobotics
ISSN (Print)2195-3562
ISSN (Electronic)2195-3570

ASJC Scopus subject areas

  • Biomedical Engineering
  • Mechanical Engineering
  • Artificial Intelligence


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