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Fuzzy Logic Controller

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  1. Fuzzy Logic Controller Intelligent System course

  2. Motivation • To control the speed of DC motor with Fuzzy Logic • To implement Fuzzy Logic in microcontroller

  3. Block Diagram

  4. Identification • It uses two inputs (error and d.error) • It uses one output (PWM) • 5 labels for each input membership function • 5 labels for output membership function (singleton) error = SP - PV d.error = error(n) – error(n-1)

  5. NB NS Z PS PB -128 -64 -40 -20 0 20 40 64 128 NB NS Z PS PB -128 -64 -40 -20 0 20 40 64 128 Input Membership Functions

  6. NB NS Z PS PB -80 -40 0 40 80 Output Membership Function

  7. Typical Response(rule design) SP

  8. Rule 1 If error is PB and d.error is Z then result is PB

  9. Rule 2 If error is Z and d.error is NB then result is NB

  10. Case 1 Error = 50 and d.error = -10 If error is PB and d.error is Z then result is PB 0.4167 0.5000 0.4167 If error is PS and d.error is Z then result is PS 0.5833 0.5000 0.5000 If error is PS and d.error is NS then result is Z 0.5833 0.2500 0.2500 If error is PB and d.error is NS then result is PS 0.4167 0.2500 0.2500

  11. Case 2 Error = 0 and d.error = 60 If error is Z and d.error is PB then result is PB 0.0000 0.8333 0.0000 If error is Z and d.error is PS then result is PS 0.0000 0.1667 0.0000

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