mechatronics and microprocessor
DESCRIPTION
Mechatronics and microprocessor. Outline . Introduction System and design of system Control, measurement and feed back system Open and closed loop system Elements of closed loop system Traditional vs mechatronics system Sequential controllers Programmable logic controller. - PowerPoint PPT PresentationTRANSCRIPT
Mechatronics and microprocessor
Outline •Introduction•System and design of system•Control, measurement and feed back
system•Open and closed loop system•Elements of closed loop system•Traditional vs mechatronics system•Sequential controllers•Programmable logic controller
Mechatronics•Mechatronics is the complete
integration of mechanical system with electrical, electronics and computer system
System •A system which consists of various
elements connected together to obtain the required output by giving a small input.
•A system can be represented with a block diagram.
input output
Modeling and modeling system•Modeling – behaviour of a real time
system represented in terms of methamatical equations.
•Modeling system – a model from which we can relate the input and output in terms of a mathematical equation.
Spring input outputForce extensio
n
control system •A group of devices or units or elements
which maintains the required output based on the preset or predefined level or quantity by controlling the input.
Fan input outputelectricit
yRequired
speedregulator
Open and closed-loop control systems•Open loop system
▫a system in which output is dependent on input.
Closed loop system▫a system in which input is dependent on
output.
Components of closed loop system•Comparison element• Error signal = reference value signal –
measured value signal
•Control element •Correction element•Process element•Measurement element
Control unit
Correction unit
Process unit
Comparison element Controlled
variable
Feed back unit/meas
uring device
Required value
Measurement system•A group of elements arranged in order to
measure the level of output in a control system.
•Measurement is quantity based. Ex displacement, temperature, velocity etc
•For accurate control of output.•Components
▫Sensors/ transducers▫Signal conditioner or amplifier▫Display
•Sensor – measures the output and generates an equivalent signal related to quantity.
•Signal conditioner – takes the signal from sensor manipulates it into a condition suitable for displaying
•Display system – output from signal conditioner is displayed.
sensor
Quantity measured
Signal condition
erDisplay
Signal related
to quantity measure
d
Suitable for
displaying
Value of quantity
sensorSignal
conditioner
Display Temperature
EMF
binary
Value of quantity
Feed back system•Feed back is a signal sent back to the
input from output.•Input varied is dependent on the feed
back signals got from output.
Heater Required
temperature
Room temperatur
e
Feedback signal of actual
temperature
Closed loop control system
• Controlled variable – room temperature• Reference value – the required room
temperature• Comparison element – the person comparing
measured value with required value• Error signal – the difference between measured
and required temperature• Control unit – the person• Correction unit – switch on the fire• Process – heating by the fire• Measuring device – a thermometer
Sequence and time based controllers•Sequence based controllers
▫These are controllers which are strictly ordered in a sequence driven.
▫Sequence is controlled by programming the microprocessor.
▫The operating sequence is called as a ‘program’.
Washing machine