Recursive-type model-free LQ controller design

A new type model-free data-based iterative controller design of the LQ regulator is introduced in this paper. This iterative approach is just corresponding to an extension of the model-based Riccati difference equation, and it is directly constructs the regulator from input-output data of an unknown system without requiring the system model. The result is extended to the model-free design of dynamical output feedback regulators as well.