Simulink Control Design™ - MathWorks

Structure of Control System for Tuning With looptune

looptune tunes the feedback loop illustrated below to meet default requirements or

requirements that you specify.

G

C

u y

C represents the controller and G represents the plant. The sensor outputsy

(measurement signals) and actuator outputs u (control signals) define the boundary

between plant and controller. The controller is the portion of your control system whose

inputs are measurements, and whose outputs are control signals. Conversely, the plant is

the remainder—the portion of your control system that receives control signals as inputs,

and produces measurements as outputs.

For example, in the control system of the following illustration, the controller C receives

the measurement y, and the reference signal r. The controller produces the controls qL

and qV as outputs.

PIL

PIV

r D y

+

G

qL

qV

pL

pV

e

C

The controller C has a fixed internal structure. C includes a gain matrix D , the PI

controllers PI_L and PI_V, and a summing junction. The looptune command tunes free

12 Loop-Shaping Design