Fuzzy Logic

What is that?

Prof. Dr. T. Nouri

Nouri@acm.org

Fuzzy Sets 1-2

Fuzzy Sets 2-2

SpeedDistance

Brake

Example: Fuzzy Driving

Fuzzy Processing Unit, FPU

Input Fuzzy Set : Distance

Input Fuzzy Set : Speed

Knowledge-Base

Knowledge-Base

Rule 2: If Distance is Low and Speed is High Then Brake is HighEtc.

Rule 1: If Distance is Middle and Speed is High Then Brake is Mittel

Output Fuzzy Set:Brake

Facts:

Distance = 35 mSpeed = 90 Km/h

Distance = 35 m, Low Speed = 90 km/h, High

Result of Rule 1 Result of Rule 2

Addition of Two Fuzzy Sets

DefuzificationCenter of Gravity

71% of Brake Intensity

Deffuzification

• The Output Fuzzy Set is converted into Discret (Crisp) Value.• Center of Gravity Method is the most used to make this conversion