ECT 459

1
ECT 459

• Lecture 2
• Control Fundamentals

2
Control Types

• Analog
• Open Loop (w/o feedback)
• Closed Loop (w/feedback)
• PID
• Digital
• Open Loop (w/o feedback)
• Closed Loop (w/feedback)
• PID
• Sequential
• Open Loop (w/o feedback)
• Closed Loop (w/feedback)
• DSP
• Other
• Artificial Neural Networks
• Fuzzy Logic

3
Control Platforms

• Mechanical
• Analog Electrical
• Microprocessor
• Pneumatic/Hydraulic
• PLC

4
Basic Elements of Control System

• Comparison Element
• Control Element
• Correction Element
• Process Element
• Measurement Element

5
Comparison Element

• Error Signal Reference Value Measured Value
• Positive vs. Negative Feedback

6
Control Element

• Decision Element
• PID/Sequential/Analog/DSP

7
Correction Element

• Actuator
• Changes the Process

8
Process Element

• What is being controlled
• Temperature/Velocity/Angle/Displacement

9
Measurement Element

• Feedback related to Process
• Transducer

10
Mechatronics Examples

• Thermostat
• Motor Speed/Position
• Water Tower
• Washing Machine