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Lecture 01
A review on the Control Systems
Course Module: Control Systems (ME338)
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Why Automatic Control?Why Automatic Control?
automotive control,automotive control,
missile guidance systems,missile guidance systems,
robotic systems,robotic systems,
control of modern manufacturing and industrial processes,control
of modern manufacturing and industrial processes,
design of the autopilot systems in the aerospace industries,
anddesign of the autopilot systems in the aerospace industries,
and
in the design of cars and trucks in automobile industries.in the
design of cars and trucks in automobile industries.
Industrial operations such as pressure, temperature,
humidity,Industrial operations such as pressure, temperature,
humidity,
viscosity, and flow processesviscosity, and flow processes
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Why Automatic Control?Why Automatic Control?
automotive control,automotive control,
missile guidance systems,missile guidance systems,
robotic systems,robotic systems,
control of modern manufacturing and industrial processes,control
of modern manufacturing and industrial processes,
design of the autopilot systems in the aerospace industries,
anddesign of the autopilot systems in the aerospace industries,
and
in the design of cars and trucks in automobile industries.in the
design of cars and trucks in automobile industries.
Industrial operations such as pressure, temperature,
humidity,Industrial operations such as pressure, temperature,
humidity,
viscosity, and flow processesviscosity, and flow processes
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Examples of the System?Examples of the System?
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Examples of the System?Examples of the System?
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Examples ofExamples of Old Engine ControlOld Engine Control
Systems?Systems?
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Examples ofExamples of New Engine ControlNew Engine Control
Systems?Systems?
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Examples ofExamples of Humidifier ControlHumidifier Control
Systems?Systems?
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Examples ofExamples of AircarftAircarft ControlControl
Systems?Systems?
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Examples of Control Systems?Examples of Control Systems?
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Examples ofExamples of HVAC ControlHVAC Control
Systems?Systems?
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Examples ofExamples of Home Heating ControlHome Heating Control
Systems?Systems?
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SystemSystem TheoryTheory
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System Control?System Control?
Open Loop ControlOpen Loop Control
Closed Loop ControlClosed Loop Control
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Method of Control System representation?Method of Control System
representation?
Pictorial representation, andPictorial representation, and
Mathematical representationMathematical representation
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Pictorial Representation?Pictorial Representation?
Summing PointSumming Point
Branch PointBranch Point
Transfer FunctionTransfer Function
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Transfer Function Equations?Transfer Function Equations?
)()(
)(
)(sHsG
sE
sB!!
)()(
)(sG
sE
sC!!
1. Open Loop :o The ratio of the feedback signal B(s) to the
actuating error signal E(s)
is called the open loop transferfunction.
o The ratio of the output C(s) to the actuating error signal
E(s) is called the
feedforward transferfunction, so that :
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Why Automatic Control?Why Automatic Control?
Closed Loop Transfer FunctionClosed Loop Transfer Function
OrOr
)()()( sEsGsC !
)()()( sBsRsE !
)()()( sCsHsR !
? A)()()()()( sCsHsRsGsC !
)()(1
)(
)(
)(
sHsG
sG
sR
sC
!
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Block Diagram Reduction?Block Diagram Reduction?
Blocks in CascadeBlocks in Cascade
Summing PointSumming Point
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Blocks in ParallelBlocks in Parallel
Shifting of a takeShifting of a take--off point from aoff point
from aposition before a block to a position afterposition before a
block to a position afterthe blockthe block
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Shifting of a takeShifting of a take--off point from aoff point
from a
position after a block to a position beforeposition after a
block to a position beforea block.a block.
Shifting of summing point from a positionbefore the block to a
position after theblock.
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Shifting of a takeShifting of a take--off point from aoff point
from aposition before a summing point to aposition before a summing
point to a
position after the summing point.position after the summing
point.
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Shifting of a takeShifting of a take--off point from aoff point
from a
position after a summing point to aposition after a summing
point to aposition before the summing point.position before the
summing point.
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Shifting of a takeShifting of a take--off point from aoff point
from a
position after a summing point to aposition after a summing
point to aposition before the summing point.position before the
summing point.
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