Mechatronics and microprocessor

1. Mechatronics and microprocessor

2. Outline • Introduction • System and design of system • Control, measurement and feed back system • Open and closed loop system • Elements of closed loop system • Traditional vsmechatronics system • Sequential controllers • Programmable logic controller

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

4. 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

5. 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 Spring output extension Force

6. 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. input output Fan electricity Required speed regulator

7. Open and closed-loop control systems • Open loop system • a system in which output is dependent on input.

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

9. Components of closed loop system • Comparison element • Error signal = reference value signal – measured value signal • Control element • Correction element • Process element • Measurement element

10. Comparison element Controlled variable Correction unit Control unit Process unit Required value Feed back unit/measuring device

11. 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

12. 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.

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

14. 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 temperature Feedback signal of actual temperature

15. Closed loop control system

16. 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

19. 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’.

20. Washing machine