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Continuous-Time ADP for Linear Systems with Partially Unknown Dynamics

Approximate dynamic programming has been formulated and applied mainly to discrete-time systems. Expressing the ADP concept for continuous-time systems raises difficult issues related to sampling time and system model knowledge requirements. In this paper is presented a novel online adaptive critic (AC) scheme, based on approximate dynamic programming (ADP), to solve the infinite horizon optimal control problem for continuous-time dynamical systems; thus bringing together concepts from the fields of computational intelligence and control theory. Only partial knowledge about the system model is used, as knowledge about the plant internal dynamics is not needed. The method is thus useful to determine the optimal controller for plants with partially unknown dynamics. It is shown that the proposed iterative ADP algorithm is in fact a quasi-Newton method to solve the underlying algebraic Riccati equation (ARE) of the optimal control problem. An initial gain that determines a stabilizing control policy is not required. In control theory terms, in this paper is developed a direct adaptive control algorithm for obtaining the optimal control solution without knowing the system A matrix