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Modern Control Technology: Components and Systems

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Modern Control Technology: Components and Systems, 2nd Edition provides an introduction to automatic control systems and components that is both comprehensive and up-to-date. Logically organized, this book takes the reader on a journey through a control system. Each chapter examines a different functional part, followed by discussion of control units and control strategies that serves to put these parts together in a full-function control system. The text emphasizes not only on how things work, but also how they work together. Thoroughly updated, this edition features new material on popular PIC and BASIC Stamp microcontrollers, plus expanded coverage of brushless DC motors, as well as networking used in control systems. Information has also been added to better address topics such as: decibels, levers, friction, clutches and brakes, tooth rotor tachometers, vision sensors, dynamic braking of DC motors, linear motors, and flux vector AC drives.

Textbook for use in twoprograms or four-year technology that include such courses as industrial controls, industrial electronics, control systems, and electromechanical systems. DLC: Automatic control.

A control system is a collection of components working together under the direction of some machine intelligence. In most cases, electronic circuits provide the intelligence, and electromechanical components such as sensors and motors provide the interface to the physical world. A good example is the modern automobile. Various sensors supply the on-board computer with information about the engine’s condition. The computer then calculates the precise amount of fuel to be injected into the engine and adjusts the ignition timing. The mechanical parts of the system include the engine, transmission, wheels, and so on. To design, diagnose, or repair these sophisticated systems, you must understand the electronics, the mechanics, and control system principles.

In days past, so-called automatic machines or processes were controlled either by analog electronic circuits, or circuits using switches, relays, and timers. Since the advent of the inexpensive microprocessor, more and more devices and systems are being redesigned to incorporate a microprocessor controller. Examples include copying machines, soft-drink machines, robots, and industrial process controllers. Many of these machines are taking advantage of the increased processing power that comes with the microprocessor and, as a consequence, are becoming more sophisticated and are including new features. Taking again the modern automobile as an example, the original motivation for the on-board computer was to replace the mechanical and vacuum-driven subsystems used in the distributor and carburetor. Once a computer was in the design, however, making the system more sophisticated was relatively easy—for example, selfadjusting fuel/air ratio for changes in altitude. Also, features such as computer-assisted engine diagnostics could be had without much additional cost. This trend toward computerized control will no doubt continue in the future.
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