July 2004 2009 Lecture Side Lecture by Suradet Tantrairatn Instructor and Researcher Chapter One week1 January 2009 Introduction to Automatic Control.

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July Lecture Side Lecture by Suradet Tantrairatn Instructor and Researcher Chapter One week1 January 2009 Introduction to Automatic Control

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Reference Book - “Modern Control Engineering”, Katsuhiko Ogata, Prentice Hall. - “Automotive Control Systems for Engine, Driveline and Vehicle”, U.Kiencke and L.Nielsen, Springer.

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 How is it important? Good Improved control is a key enabling technology underpinning: - generally - Convenience and Comfort - doctor - Precision of tools - industry - Enhance product quality - Waste minimization - Higher safety margins

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 What is Control System? Open-Loop Control System (No feedback)

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 What is Control System? (2) Dynamic Response Open-Loop Control System (No feedback)

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 What is Control System? (3) Feedback Feedback is a key tool that can be used to modify the behavior of a system. This behavior altering effect of feedback is a key mechanism that control engineers exploit deliberately to achieve the objective of acting on a system to ensure that the desired performance specifications are achieved.

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 What is Control System? (4) Closed-Loop Control System (No feedback)

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 What is Control System? (5) Response of a position control system showing effect of high and low controller gain on the output response

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Example Control System? (1) Temperature Control System ( Heater or Air Condition )

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Example Control System? (2) Open Loop Closed Loop

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Example Control System? (3) Vehicle Control System

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Example Control System? (4) Autopilot Control System

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Control System Design Cycle

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Modeling & Design in Control I. DYNAMIC MODELING Deriving a dynamic model ( = set of differential equations that describes the dynamic behavior of the plant) Linearization the dynamic model if necessary II. DESIGN OF A CONTROLLER: Several design methods 1. Classical control or Root Locus Design : Define the transfer function; Apply root locus, loop shaping, 2. Modern control : Convert ODE to state equation; Apply Pole Placement, Robust control, … 3. Nonlinear control : Apply Lyapunov’s stability criterion

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Definition of state space representations

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 A first example of Modeling: DC Motor

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 A second example of Modeling: Suspension

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 A second example of Modeling: Suspension (2)

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 Linear systems : transfer function Equivalence transfer function - state space representation

© AIRBUS UK LTD All rights reserved. Confidential and proprietary document. Month 200X2009 Subject Name Automotive Automatic ControlPage 2 State-Space Representations of Transfer-Function Systems Go to Ogata Book 723