Abstract: Fuzzy Logic Controller based Optimal Linear Quadratic Regulator (FC-LQR) for the control of a nonlinear CSTR system. The primary thought is to outline a supervisory fuzzy controller proficient to modify the controller parameters keeping in mind the end goal to get the coveted axes positions under varieties of the system parameters and load varieties. In the event that speed and precision are required, the control utilizing traditional techniques is hard to acknowledge in view of the high nonlinearity of the CSTR system. In control plan, it is regularly important to outline a controller to satisfy, in an optimal shape, certain performance criteria and requirements notwithstanding stability

Keywords: Fuzzy Logic Controller, FC-LQR, LMI, Stability.

| DOI: 10.17148/IJIREEICE.2021.9517