IMC — Dahlin temperature regulator for thermostat

In this work, an IMC (Internal Model Control) — Dahlin temperature control method based on relay feedback self-tuning identification is proposed. The proposed method is based on relay feedback self-tuning identification and has double-loop control structure. According to the time delay and large time constant features of thermostat regulation, Dahlin control algorithm is applied to the inner loop to stabilize the process. To compensate the ringing response of Dahlin control and improve the robustness of the overall system, IMC control algorithm is applied to the outer loop. The parameters of Dahlin controller and IMC controller are optimized with LQR (Linear Quadratic Regulator) algorithm. The proposed method has been applied to develop a temperature regulator based on C2B8SNFA MCU (Micro Controller Unit) for thermostat. The real application results have verified the feasibility and effectiveness of the proposed method and the developed temperature regulator for thermostat.