James K. Peckol - Introduction to Fuzzy Logic

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James K. Peckol

Principal Lecturer Emeritus, Department of Electrical and Computer Engineering, University of Washington, Seattle, WA, USA

and

President, Oxford Consulting, Ltd, Seattle, WA, USA

This edition first published 2021

© 2021 John Wiley & Sons Ltd

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Library of Congress Cataloging‐in‐Publication Data

Name: Peckol, James K., author. | John Wiley & Sons, publisher.

Title: Introduction to fuzzy logic / James K. Peckol.

Description: Hoboken, NJ : Wiley, 2021. | Includes bibliographical references and index.

Identifiers: LCCN 2021011123 (print) | LCCN 2021011124 (ebook) | ISBN 9781119772613 (cloth) | ISBN 9781119772620 (adobe pdf) | ISBN 9781119772637 (epub)

Subjects: LCSH: Fuzzy logic. | Fuzzy sets. | Logic, Symbolic and mathematical.

Classification: LCC QA9.64 .P43 2021 (print) | LCC QA9.64 (ebook) | DDC 511.3/13–dc23

LC record available at https://lccn.loc.gov/2021011123LC ebook record available at https://lccn.loc.gov/2021011124

Cover Design: Wiley

Cover Image: © Rasi Bhadramani/iStock/Getty Images

To my family: Near and Extended, Close and Distant,Present and Departed, So Similar,So Different, So Known, So Surprising …especially to our youngest brother Karl,taken from us out of season during the last voyageof the Edmund Fitzgerald.

Let's begin with these questions: “Exactly what is fuzzy logic?” “Why is the logic called fuzzy?” “Who might use fuzzy logic?” These are very good questions. People may have heard something about fuzzy logic and other kinds of logic but may not be quite sure what these terms mean or quite understand the applications.

Does fuzzy logic mean that someone's comment in a discussion is very confused? Let's try to answer that question and several of the other more common ones over the course of this text by starting with some simple fuzzy examples.

Our daily language is often routinely fuzzy; yet most of the time we easily understand it. Let's start by looking at some familiar expressions from our everyday exchanges.

Where did you park the car?

I parked up close to the front door of the building.

Please put the box in the trunk of the car.