APC UCCS Temperature Control User Manual download pdf (Page 4)

ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–4

1.2: An illustrative example of a feedback control system

We proceed by looking at an example that allows us to deﬁne some

important terminology.

Consider the system designed to maintain the temperature of your

house/apartment.

We can draw a block diagram, which identiﬁes the m ajor components

of the system, and omits unnecessary details. It also highlights the

information/energy ﬂows:

Desired

Tem p.

Room

Tem p.

Heat Loss (Q

out

)

HouseFurnace

Gas

Valve

Thermo-

stat

Central component = process or plant, one of whose variables we

want to control. e.g.,Plant=

;Variable= .

Disturbance = some system input that we do not control.

e.g.,Disturbance=

Actuator = device that inﬂuences controlled variable.

e.g.,Actuator=

Reference sensor measures desired system output.

Output sensor measures actual system output.

Compensator or controller = device that computes the control effort

to apply the the actuator, based on sensor readings.

e.g.,

combines the last three functions.

Lecture notes prepared by and copyright

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

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APC UCCS Temperature Control User Manual Page 4