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Feedback. Feedback loop (CV changes input). + -. E. Controller Gc. Plant Gp. SP. MV (Manipulated Variable. S. Sensor Gs. CV Controlled Variable. The input of each block determines the output. CV = Gp (s)*MV. Plant Gp. MV

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Presentation Transcript
feedback loop cv changes input
Feedback loop (CV changes input)

+

-

E

Controller Gc

PlantGp

SP

MV

(Manipulated Variable

S

SensorGs

CV

Controlled Variable

the input of each block determines the output
The input of each block determines the output
  • CV = Gp(s)*MV

PlantGp

MV

(Manipulated Variable

CV

Controlled Variable

slide4

MV = Gc E

E

Controller Gc

MV

(Manipulated Variable

combine blocks
Combine blocks
  • CV = Gp*Gc*E

E

Controller Gc

PlantGp

MV

(Manipulated Variable

CV

Controlled Variable

slide6

E = SP – S

  • S = Gs*CV or E = SP – Gs*CV

+

-

E

SP

S

SensorGs

CV

Controlled Variable

do the math to get the closed loop transfer function
Do the math to get the “closed loop” transfer function
  • CV = Gp*Gc*E
  • E = SP – Gs*CV
  • CV = Gp*Gc*(SP – Gs*CV)
  • Solve for CV
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