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Structured Development for Real-Time Systems, Volume 2: Essential Modeling Techniques by Stephen J. Mellor, Paul T. Ward

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Appendix A – Cruise Control

TABLE OF CONTENTS

1. Background

2. Context Schema

3. Event List

4. Preliminary Transformation Schema

5. Leveled Set of Schemas

6. Data Dictionary

7. Transformation Specifications

Problem Statement

The ordinary household thermostat performs “closed loop control” – given a desired temperature setting, it monitors the actual room temperature and turns the heat on and off to keep actual temperature close to desired temperature. In maintaining a desired speed, the driver of an automobile does something quite similar; he or she monitors the actual speed by watching the speedometer, and depresses or releases the accelerator pedal to keep actual speed close to desired speed. A cruise control system relieves the driver of ...

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