Authors: Obaid Siddiqui and Deepak Kumar

ISBN: 978-81-69297-12-7

DOI: https://doi.org/10.59646/738

Date of Publication: May 30, 2026

Cite this book: Obaid S and Deepak K, (2026), Control System (As per the curriculum of Bihar Engineering University, Patna), San International Scientific Publications, ISBN: 978-81-69297-12-7, DOI: https://doi.org/10.59646/738

Preface

Control systems form the backbone of modern engineering and technology, enabling machines, processes, and devices to operate with precision, efficiency, and reliability. From industrial automation and power generation to robotics, transportation, aerospace, and intelligent manufacturing, control systems play a vital role in ensuring that dynamic systems achieve desired performance while maintaining stability and robustness. The rapid advancement of digital technologies, embedded systems, artificial intelligence, and cyber-physical systems has further expanded the scope and significance of control engineering in contemporary applications.

This book, “Control System,” has been carefully designed to provide a comprehensive understanding of the fundamental principles, analytical techniques, and design methodologies used in control engineering. The content is organized in a systematic manner, beginning with real-world control problems, mathematical modeling of physical systems, transfer functions, feedback concepts, and block diagram representations. These foundational topics establish the basis for understanding the behavior of dynamic systems and their responses to various inputs.

The book extensively covers time-domain analysis, including standard test signals, transient and steady-state performance measures, stability concepts, Routh–Hurwitz criterion, relative stability, and root-locus techniques. Frequency-domain methods such as polar plots, Bode plots, Nyquist stability analysis, gain margin, phase margin, and closed-loop frequency response are presented to help readers understand system behavior from a frequency-response perspective. Special emphasis is placed on the relationship between time-domain and frequency-domain characteristics, enabling learners to develop a unified understanding of system performance. A dedicated section on controller design introduces important concepts such as stability improvement, disturbance rejection, robustness, PID controllers, compensator design, and analog as well as digital implementation techniques. The book further explores state-variable analysis, including state-space representation, controllability, observability, pole placement, discrete-time systems, and modern state-space methods. These topics provide the foundation for advanced control system analysis and design used in modern engineering practice. Recognizing recent developments in the field, the final unit introduces optimal control and nonlinear control concepts, including performance indices, regulator and tracking problems, Lyapunov stability methods, adaptive control, feedback linearization, and nonlinear system analysis. These topics expose readers to modern approaches employed in complex and intelligent control applications. The inclusion of emerging themes highlights the evolving nature of control engineering and its integration with advanced computational techniques.  This book is intended for undergraduate and postgraduate students of Electrical, Electronics, Instrumentation, Mechanical, Mechatronics, Robotics, and related engineering disciplines. It will also serve as a valuable reference for researchers, practicing engineers, and professionals seeking a clear and structured understanding of classical and modern control system concepts. Every effort has been made to present the material in a simple, logical, and application-oriented manner, supported by theoretical foundations and practical insights. It is hoped that this book will inspire learners to explore the fascinating field of control systems and apply its principles to solve real-world engineering challenges.