Simulink Control Design™ - MathWorks

Design PID Controller Using Estimated Frequency

Response

This example shows how to design a PI controller using a frequency response estimated

from a Simulink model. This is an alternative PID design workflow when the linearized

plant model is invalid for PID design (for example, when the plant model has zero gain).

Open the Model

Open the engine control model and take a few moments to explore it.

mdl = 'scdenginectrlpidblock';

open_system(mdl)

The PID loop includes a PI controller in parallel form that manipulates the throttle angle

to control the engine speed. The PI controller has default gains that makes the closed

loop system oscillate. We want to design the controller using the PID Tuner that is

launched from the PID block dialog.

open_system([mdl '/Engine Speed (rpm)'])

sim(mdl)

Design PID Controller Using Estimated Frequency Response