Introduction to feedback control

Terminology. Formulation of the control problem

Lecture

Solutions to the control problem

• Control using a constant control signal
• Control using an error-based control signal (feedback control)

We run together the control system simulator Level control of chip tank (which is in the KYBSIM set of simulators).

Examples of control systems. P&I diagram and block diagram

Lecture:

• Example: Level control of wood chip tank
• Example: Temperature control of liquid tank

Controller functions

Lecture:

• On/off controller
• PID controller
• The importance of the individual PID control terms

KYBSIM: Level control of chip tank.

Positive or negative controller gain? KYBSIM: PID controller with direct action (negative gain)

Performance index of control systems

Lecture.

Try the KYBSIM simulator You - the controller! Who is the best controller in the class (i.e., who gets the smallest IAE index value)?

Measurement noise in the control loop

Lecture.

KYBSIM: Measurement noise in the control loop

Control loop stability

Lecture

KYBSIM: Level control of chip tank

Reverse or direct action in the controller?

Lecture

KYBSIM: PID controller with direct action (negative gain)

[Home page of the control engineering part]

Updated March 23, 2006 by Finn Haugen. E-mail: finn@techteach.no.