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ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–5

Amoreabstractblockdiagram

!

The detail in the pr ior block diagram is helpful to identify the physical

components of the particular system of interest.

!

However, we can abstract the ideas from the prior diagram to arrive at

amoregeneralblockdiagramthatisapplicabletomostscenariosof

interest:

Ref.

Value

Output

Disturbance

Plant

Reference

Sensor

Output

Sensor

Compen-

sator

Actuator

error

“Negative Feedback”

An even more abstract block diagram

!

Finally, by assuming the presence of (perfect) sensors and actuators

(absorbed into the plant), we can make an even more abstract block

diagram.

Ref.

Value

Output

Disturbance

Plant

Compen-

sator

!

This is the picture of a feedback control system that you should have

in mind for the remainder of this course.

Lecture notes prepared by and copyright

c

! 1998–2013, Gregory L. Plett and M. Scott Trimboli

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