Two-Degree-of-Freedom PID Controllers

By M. Araki, Hidefumi Taguchi. 2003

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Setpoint weighted PID controller tuning for unstable system using heuristic algorithm (2012, background): “The above 2DOF PID structure can be mathematically represented as follows [19]:”
Performance analysis of 2‐DOF tracking control for a class of nonlinear uncertain systems with discontinuous disturbances (2018, unknown): “In addition, let the initial values of the system (1) satisfy ‖‖‖[zT(t0), xT(t0)]‖‖‖ ≤ ρ0, (19)”
Design and Experiments for a Class of Fuzzy Controlled Servo Systems (2008, background): “Since the main control aims, high-performance indexes in set-point tracking and regulation with respect to load disturbance inputs, are difficult to be fulfilled by PI controllers, one typical approach is to design 2-DOF controllers with advantages over the 1-DOF ones [3], [10], [11].”
A survey on industrial applications of fuzzy control (2011, unknown): “Since the main tasks in control, the achievement of high performance in set-point tracking and the regulation in the presence of disturbance inputs are difficult to be accomplished by means of PI and PID controllers, one typical approach is to design two-degree-of-freedom (2-DOF) controllers which h”