Mechatronics and microprocessor Outline Introduction System and design

Outline • • Introduction System and design of system Control, measurement and feed back

Mechatronics • Mechatronics is the complete integration of mechanical system with electrical, electronics and

System • A system which consists of various elements connected together to obtain the

Modeling and modeling system • Modeling – behaviour of a real time system represented

control system • A group of devices or units or elements which maintains the

Open and closed-loop control systems • Open loop system ▫ a system in which

Closed loop system ▫ a system in which input is dependent on output.

Components of closed loop system • Comparison element • Error signal = reference value

Comparison element Required value Control unit Correction unit Feed back unit/measu ring device Process

Measurement system • A group of elements arranged in order to measure the level

• Sensor – measures the output and generates an equivalent signal related to

Signal related to quantity measured Quantity measured Signal conditioner sensor Temperature EMF sensor Suitable

Feed back system • Feed back is a signal sent back to the input

• Controlled variable – room temperature • Reference value – the required room

Sequence and time based controllers • Sequence based controllers ▫ These are controllers which

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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. input Force Spring output extension

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 electricity regulator Fan output Required speed

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

Comparison element Required value Control unit Correction unit Feed back unit/measu ring device Process unit Controlled variable

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.

Signal related to quantity measured Quantity measured Signal conditioner sensor Temperature EMF sensor Suitable for displaying Value of quantity Display Value of quantity binary Signal conditioner Display

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. Required temperature Heater Feedback signal of actual temperature Room 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’.

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