This document summarizes the design and implementation of a fuzzy logic controller for speed control of a DC motor. It describes creating a fuzzy logic class library in Visual Studio, defining the Mamdani fuzzy system and input/output variables, adding trapezoidal and triangular membership functions to fuzzify the speed input and output voltage, writing five fuzzy rules to relate them, and taking a screenshot of the project.

1. Waleed Abd El- Megeed El- Badry
Mechatronics Department
Faculty of Engineering
Misr University for Science & Technology
wbadry@must.edu.eg
Microsoft®
CERTIFIED
Professional
Developer

2. Motivation
Project Outlines
Briefed Introduction
Work Carried Out
Results and Conclusion

4. Signal
Conditioning
Electronics
Friction, Coupling
and Torque
Mechatronics
Mechanical Control
Engineering
Fuzzy Logic
Controller
Computer
Science
Interfacing
Programming

6. Based on Linear model of DC Motor
Source: Mo-Yuen Chow, ”Fuzzy Logic Microcontroller Implementation
for DC Motor Speed Control”

7. Source: http://www.Fuzzy-Logic.com

8. Knowledge Base
Fuzzification Fuzzy Rules Defuzzification
Coupling
D/A M T A/D

9. DC Motor-Tachometer Specification:
24V DC
180 RPM
1.5 A
NI USB 6008
12 Bits, 200Ks/S A/D Converter (0-10V)
12 Bits, D/A Converter (0-5V)

11. BJT Amplifier
• Sourcing Current Up to 10 A
•Withstand Collector Voltage up
to 100V
Major Drawback:
Nonlinearity

14. • Designing a fuzzy logic class library was key objective
• Visual Studio proved to be a better performing language for real time applications.
• Object Orientation facilitates software design.
•.NET framework has rich library that developers can utilize from any language in VS
family (C#, VB and VC++)
Microsoft®
Visual Studio 2008

15. Fuzzy System
•Mamdani
•Sugeno
Fuzzy Variable
Name •Input Range
•Output
Fuzzy Term
Trapezoidal Triangular

16. 'Declaration of Fuzzy System
Dim fsSpeedControl As New MamdaniFuzzySystem
Dim fvSpeed As New FuzzyVariable("Speed", 0.0, 1.0)
Dim fvOutputVoltage As New FuzzyVariable("OutputVoltage", 0.0, 1.0)
'Fuzzification of Speed
'Input Speed Fuzzy Terms
fvSpeed.Terms.Add(New FuzzyTerm("VerySlow", New TrapezoidMembershipFunction(0.0, 0.0, 0.3, 0.4)))
fvSpeed.Terms.Add(New FuzzyTerm("Slow", New TriangularMembershipFunction(0.3, 0.4, 0.5)))
fvSpeed.Terms.Add(New FuzzyTerm("AboutRight", New TriangularMembershipFunction(0.4, 0.5, 0.6)))
fvSpeed.Terms.Add(New FuzzyTerm("Fast", New TriangularMembershipFunction(0.5, 0.6, 0.7)))
fvSpeed.Terms.Add(New FuzzyTerm("VeryFast", New TrapezoidMembershipFunction(0.6, 0.7, 1.0, 1.0)))
fsSpeedControl.Input.Add(fvSpeed)
'Fuzzification of Output Voltage
'Output Voltage Fuzzy Terms
fvOutputVoltage.Terms.Add(New FuzzyTerm("SpeedUp", New TrapezoidMembershipFunction(0.6, 0.7, 1.0, 1.0)))
fvOutputVoltage.Terms.Add(New FuzzyTerm("SlightlySpeedUp", New TriangularMembershipFunction(0.5, 0.6, 0.7)))
fvOutputVoltage.Terms.Add(New FuzzyTerm("NoChange", New TriangularMembershipFunction(0.4, 0.5, 0.6)))
fvOutputVoltage.Terms.Add(New FuzzyTerm("SlightlySlowDown", New TriangularMembershipFunction(0.3, 0.4, 0.5)))
fvOutputVoltage.Terms.Add(New FuzzyTerm("SlowDown", New TrapezoidMembershipFunction(0.0, 0.0, 0.3, 0.4)))
fsSpeedControl.Output.Add(fvOutputVoltage)

18. Dim Rule1 = fsSpeedControl.ParseRule("if (Speed is VerySlow) then (OutputVoltage is SpeedUp)")
Dim Rule2 = fsSpeedControl.ParseRule("if (Speed is Slow) then (OutputVoltage is SlightlySpeedUp)")
Dim Rule3 = fsSpeedControl.ParseRule("if (Speed is AboutRight) then (OutputVoltage is NoChange)")
Dim Rule4 = fsSpeedControl.ParseRule("if (Speed is Fast) then (OutputVoltage is SlightlySlowDown)")
Dim Rule5 = fsSpeedControl.ParseRule("if (Speed is VeryFast) then (OutputVoltage is SlowDown)")

21. Screenshot from project