Estimating System State During Human Walking with a Powered Ankle-Foot Orthosis


This paper presents a state estimator that reliably detects gait events during human walking with a portable powered ankle-foot orthosis (AFO), based only on measurements of the ankle angle and of contact forces at the toe and heel. Effective control of the AFO critically depends on detecting these gait events. A common approach detects gait events simply by checking if each measurement exceeds a given threshold. Our approach uses cross correlation between a window of past measurements and a learned model to estimate the configuration of the human walker, and detects gait events based on this estimate. We tested our approach in experiments with five healthy subjects and with one subject that had neuromuscular impairment. Using motion capture data for reference, we compared our approach to one based on thresholding and to another common one based on k -nearest neighbors. The results showed that our approach reduced the RMS error by up to 40% for the impaired subject and up to 49% for the healthy subjects. Moreover, our approach was robust to perturbations due to changes in walking speed and to control actuation.



Sensors, Legged locomotion, Torque, Data models, State estimation, Event detection


Copyright 2011 IEEE/ASME Transactions on Mechatronics. This is a post-print version of a published paper that is available at: Recommended citation: Li, David Yifan, Aaron Becker, Kenneth Alex Shorter, Timothy Bretl, and Elizabeth T. Hsiao-Wecksler. "Estimating system state during human walking with a powered ankle-foot orthosis." IEEE/ASME Transactions on Mechatronics 16, no. 5 (2011): 835-844. DOI: 10.1109/TMECH.2011.2161769 This item has been deposited in accordance with publisher copyright and licensing terms and with the author’s permission.