Real-Time Motion Planning of a Hydraulic Excavator using Trajectory Optimization and Model Predictive Control

Automation of excavation tasks requires real-time trajectory planning satisfying various constraints. To guarantee both constraint feasibility and real-time trajectory re-plannability, we present an integrated framework for real-time optimization-based trajectory planning of a hydraulic excavator. T...

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Bibliographic Details
Published in:Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems pp. 2135 - 2142
Main Authors: Lee, Dongjae, Jang, Inkyu, Byun, Jeonghyun, Seo, Hoseong, Kim, H. Jin
Format: Conference Proceeding
Language:English
Published: IEEE 27.09.2021
Subjects:
Excavation
Hydraulic systems
Planning
Prediction algorithms
Real-time systems
Trajectory
Trajectory planning
ISSN:2153-0866
Online Access:Get full text
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Summary:Automation of excavation tasks requires real-time trajectory planning satisfying various constraints. To guarantee both constraint feasibility and real-time trajectory re-plannability, we present an integrated framework for real-time optimization-based trajectory planning of a hydraulic excavator. The proposed framework is composed of two main modules: a global planner and a real-time local planner. The global planner computes the entire global trajectory considering excavation volume and energy minimization while the local counterpart tracks the global trajectory in a receding horizon manner, satisfying dynamic feasibility, physical constraints, and disturbance-awareness. We validate the proposed planning algorithm in a simulation environment where two types of operations are conducted in the presence of emulated disturbance from hydraulic friction and soil-bucket interaction: shallow and deep excavation. The optimized global trajectories are obtained in an order of a second, which is tracked by the local planner at faster than 30 Hz. To the best of our knowledge, this work presents the first real-time motion planning framework that satisfies constraints of a hydraulic excavator, such as force/torque, power, cylinder displacement, and flow rate limits.
ISSN:2153-0866
DOI:10.1109/IROS51168.2021.9635965