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Article Navigation >  IEEE/CAA Journal of Automatica Sinica  > 2024  > In Press, Accepted Manuscript
M. Zhao, D. Wang, S. Song, and J. Qiao, “Safe Q-learning for data-driven nonlinear optimal control with asymmetric state constraints,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 12, pp. 1–15, Dec. 2024. doi: 10.1109/JAS.2024.124509
Citation: M. Zhao, D. Wang, S. Song, and J. Qiao, “Safe Q-learning for data-driven nonlinear optimal control with asymmetric state constraints,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 12, pp. 1–15, Dec. 2024. doi: 10.1109/JAS.2024.124509
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Safe Q-Learning for Data-Driven Nonlinear Optimal Control With Asymmetric State Constraints

doi: 10.1109/JAS.2024.124509
Funds:  This work was supported in part by the National Science and Technology Major Project (2021ZD0112302) and the National Natural Science Foundation of China (62222301, 61890930-5, 62021003)
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    Abstract
  • This article develops a novel data-driven safe Q-learning method to design the safe optimal controller which can guarantee constrained states of nonlinear systems always stay in the safe region while providing an optimal performance. First, we design an augmented utility function consisting of an adjustable positive definite control obstacle function and a quadratic form of the next state to ensure the safety and optimality. Second, by exploiting a pre-designed admissible policy for initialization, an off-policy stabilizing value iteration Q-learning (SVIQL) algorithm is presented to seek the safe optimal policy by using offline data within the safe region rather than the mathematical model. Third, the monotonicity, safety, and optimality of the SVIQL algorithm are theoretically proven. To obtain the initial admissible policy for SVIQL, an offline VIQL algorithm with zero initialization is constructed and a new admissibility criterion is established for immature iterative policies. Moreover, the critic and action networks with precise approximation ability are established to promote the operation of VIQL and SVIQL algorithms. Finally, three simulation experiments are conducted to demonstrate the virtue and superiority of the developed safe Q-learning method.

     

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