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Open Loop
& Closed
Loop System
NAME- NITYANANDA GHOSH
DEPARTMENT- APPLIED ELECTRONICS &
INSTRUMENTATION ENGINEERING
UNIVERSITY ROLL NO- 10505522026
SEMESTER- 5TH
CLASS ROLL NO- 17
Control
Systems
• An integral part of any industrial society
• Many applications including transportation,
automation, manufacturing, home appliances,…
• Helped exploration of the oceans and space
• Examples: –
 Temperature control
 Flight control
 Process control
TypesofControlSystems
Plant
r Sensors
Actuators
Controller
control
input
u
disturbance
d
command output
y
Open loop system
Plant Sensors
Actuators
Controller
error
e
control
input
u
disturbance
d
command
+
r
_
output
y
Closed loop system
ControlSystem
Comparison
• Openloop:
 Theoutputvariablesdonotaffecttheinputvariables
 Thesystemwill followthedesiredreferencecommandsif nounpredictableeffects
occur
 Itcancompensatefordisturbancesthataretakenintoaccount
 Itdoesnotchangethesystemstability
• Closedloop:
 Theoutputvariables doaffecttheinputvariablesinordertomaintainadesired
systembehavior
 Requiresmeasurement(controlledvariablesorothervariables)
 Requirescontrolerrorscomputedasthedifferencebetween thecontrolledvariable
andthereferencecommand
 Computescontrolinputsbasedonthecontrolerrorssuchthatthecontrolerroris
minimized
 Abletorejecttheeffectofdisturbances
 Canmakethesystemunstable,wherethecontrolledvariablesgrowwithout bound
OverviewofClosedLoopControlSystems
Disturbances
Computer /
Microcontroller
Plant
Inputs
Outputs
Sensors
Actuators
ADC
DAC
Control Algorithm
Scope
Model
Power Amp
Function
Generator
Reference Inputs
(Setpoints)
Example-
Open Loop
System
 The clothes dryer is one of the examples of the
open-loop control system. In this, the control action
can be done physically through the operator.
Based on the clothing’s wetness, the operator will
fix the timer to 30 minutes. So after that, the timer
will discontinue even after the machine clothes are
wet.
The dryer in the machine will stop functioning even
if the preferred output is not attained. This displays
that the control system doesn’t feedback. In this
system, the controller of the system is the timer.
Example-
Open Loop
System
 The best example of the closed-loop control
system is AC or air conditioner. The AC controls
the temperature by evaluating it with the nearby
temperature. The evaluation of temperature can be
done through the thermostat. Once the air
conditioner gives the error signal is the main
difference between the room and the surrounding
temperature. So the thermostat will control the
compressor.
These systems are accurate, expensive, reliable,
and requires high maintenance.

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Open Loop & Closed Loop System.pdf

  • 1. Open Loop & Closed Loop System NAME- NITYANANDA GHOSH DEPARTMENT- APPLIED ELECTRONICS & INSTRUMENTATION ENGINEERING UNIVERSITY ROLL NO- 10505522026 SEMESTER- 5TH CLASS ROLL NO- 17
  • 2. Control Systems • An integral part of any industrial society • Many applications including transportation, automation, manufacturing, home appliances,… • Helped exploration of the oceans and space • Examples: –  Temperature control  Flight control  Process control
  • 3. TypesofControlSystems Plant r Sensors Actuators Controller control input u disturbance d command output y Open loop system Plant Sensors Actuators Controller error e control input u disturbance d command + r _ output y Closed loop system
  • 4. ControlSystem Comparison • Openloop:  Theoutputvariablesdonotaffecttheinputvariables  Thesystemwill followthedesiredreferencecommandsif nounpredictableeffects occur  Itcancompensatefordisturbancesthataretakenintoaccount  Itdoesnotchangethesystemstability • Closedloop:  Theoutputvariables doaffecttheinputvariablesinordertomaintainadesired systembehavior  Requiresmeasurement(controlledvariablesorothervariables)  Requirescontrolerrorscomputedasthedifferencebetween thecontrolledvariable andthereferencecommand  Computescontrolinputsbasedonthecontrolerrorssuchthatthecontrolerroris minimized  Abletorejecttheeffectofdisturbances  Canmakethesystemunstable,wherethecontrolledvariablesgrowwithout bound
  • 6. Example- Open Loop System  The clothes dryer is one of the examples of the open-loop control system. In this, the control action can be done physically through the operator. Based on the clothing’s wetness, the operator will fix the timer to 30 minutes. So after that, the timer will discontinue even after the machine clothes are wet. The dryer in the machine will stop functioning even if the preferred output is not attained. This displays that the control system doesn’t feedback. In this system, the controller of the system is the timer.
  • 7. Example- Open Loop System  The best example of the closed-loop control system is AC or air conditioner. The AC controls the temperature by evaluating it with the nearby temperature. The evaluation of temperature can be done through the thermostat. Once the air conditioner gives the error signal is the main difference between the room and the surrounding temperature. So the thermostat will control the compressor. These systems are accurate, expensive, reliable, and requires high maintenance.