Active disturbance rejection control for handling slip in tracked vehicle locomotion

[+] Author and Article Information
Bijo Sebastian

Mem. ASME, Robotics and Mechatronics Laboratory, Mechanical Engineering Department, Virginia Tech, Blacksburg, VA 24060

Pinhas Ben-Tzvi

Mem. ASME, Robotics and Mechatronics Laboratory, Mechanical Engineering Department, Virginia Tech, Blacksburg, VA 24060

1Corresponding author.

ASME doi:10.1115/1.4042347 History: Received August 03, 2018; Revised December 09, 2018


This paper describes the use of an Active Disturbance Rejection Controller (ADRC) to estimate and compensate for the effect of slip in an online manner to improve the path tracking performance of Autonomous Ground Vehicles (AGVs). AGVs with skid-steer locomotion mode are extensively used for robotic applications in the fields of agriculture, transportation, construction, warehouse maintenance, and mining. Majority of these applications such as performing reconnaissance and rescue operations in rough terrain or autonomous package delivery in urban scenarios, require the system to follow a path predetermined by a high-level planner or based on a predefined task. In the absence of effective slip estimation and compensation, the AGVs, especially tracked vehicles, can fail to follow the path as given out by a high-level planner. The proposed ADRC architecture uses a generic mathematical model that can account for the scaling and shift in the states of the system due to the effects of slip through augmented parameters. An Extended Kalman Filter observer is used to estimate the varying slip parameters online. The estimated parameters are then used to compensate for the effects of the slip at each iteration by modifying the control actions given by a low-level path tracking controller. The proposed approach is validated through experiments over the flat and uneven terrain conditions of asphalt, vinyl flooring, artificial turf, grass, and gravel using a tracked skid-steer mobile robot. A detailed discussion on the results and directions for future research is also presented.

Copyright (c) 2018 by ASME
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