Safety-critical Policy Iteration Algorithm for Control under Model Uncertainty

Navid Moshtaghi Yazdani (Department of Electrical Engineering, Mashhad branch, Islamic Azad University, Mashhad, Iran)
Reihaneh Kardehi Moghaddam (Department of Electrical Engineering, Mashhad branch, Islamic Azad University, Mashhad, Iran)
Mohammad Hasan Olyaei (Department of Electrical Engineering, Sadjad University of Technology, Mashhad, Iran)

Article ID: 4361

Abstract


Safety is an important aim in designing safe-critical systems. To design such systems, many policy iterative algorithms are introduced to find safe optimal controllers. Due to the fact that in most practical systems, finding accurate information from the system is rather impossible, a new online training method is presented in this paper to perform an iterative reinforcement learning based algorithm using real data instead of identifying system dynamics. Also, in this paper the impact of model uncertainty is examined on control Lyapunov functions (CLF) and control barrier functions (CBF) dynamic limitations. The Sum of Square program is used to iteratively find an optimal safe control solution. The simulation results which are applied on a quarter car model show the efficiency of the proposed method in the fields of optimality and robustness.

Keywords


Safe-critical; Optimal controller; Reinforcement learning; Lyapunov; Sum-of-Square

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References


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DOI: https://doi.org/10.30564/aia.v4i1.4361

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