ROTEC: Robust to Early Termination Command Governor for Systems with Limited Computing Capacity
Abstract
A Command Governor (CG) is an optimization-based add-on scheme to a nominal closed-loop system. It is used to enforce state and control constraints by modifying reference commands. This paper considers the implementation of a CG on embedded processors that have limited computing resources and must execute multiple control and diagnostics functions; consequently, the time available for CG computations is limited and may vary over time. To address this issue, a robust to early termination command governor is developed which embeds the solution of a CG problem into the internal states of a virtual continuous-time dynamical system which runs in parallel to the process. This virtual system is built so that its trajectory converges to the optimal solution (with a tunable convergence rate), and provides a sub-optimal but feasible solution whenever its evolution is terminated. This allows the designer to implement a CG strategy with a small sampling period (and consequently with a minimum degradation in its performance), while maintaining its constraint-handling capabilities. Simulations are carried out to assess the effectiveness of the developed scheme in satisfying performance requirements and real-time schedulability conditions for a practical vehicle rollover example.
Cite
@article{arxiv.2201.02856,
title = {ROTEC: Robust to Early Termination Command Governor for Systems with Limited Computing Capacity},
author = {Mehdi Hosseinzadeh and Bruno Sinopoli and Ilya Kolmanovsky and Sanjoy Baruah},
journal= {arXiv preprint arXiv:2201.02856},
year = {2022}
}