1 Introduction 1 -- 1.1 Definition of nonlinear systems 1 -- 1.2 Nonlinear systems dynamics analysis and control 1 -- 1.3 Why operator-based nonlinear control system? 2 -- 1.4 An overview of the book 2 -- 1.5 Acknowledgments 3 -- 2 Robust right coprime factorization for nonlinear plants with uncertainties 5 -- 2.1 Preliminaries 5 -- 2.2 Operator theory 11 -- 3 Robust stability of operator-based nonlinear control systems 27 -- 3.1 Concept of operator based robust stability 27 -- 3.2 Design methods of nonlinear systems with uncertainties 27 -- 3.3 Operator-based robust anti-windup nonlinear feedback control systems design 38 -- 3.4 Operator-based multi-input and multi-output(MIMO) nonlinear feedback control systems design 58 -- 3.5 Operator-based time-varying delayed nonlinear feedback control systems design 110 -- 4 Tracking issues and fault detection issues in nonlinear control systems 121 -- 4.1 Operator-based tracking compensator in nonlinear feedback control systems design 121 -- 4.2 Robust control for nonlinear systems with unknown perturbations using simplified robust right co-prime factorization 128 -- 4.3 Operator-based actuator fault detection methods 146 -- 4.4 Operator-based input command fault detection method in nonlinear feedback control systems 159 -- 5 Operator based nonlinear control systems with smart actuators 177 -- 5.1 Operator-based robust nonlinear feedback control systems design for non-symmetric backlash 177 -- 5.2 Operator-based robust nonlinear feedback control systems design for symmetric and non-symmetric hysteresis 190 -- 5.3 Operator-based nonlinear feedback systems application for smart actuators 203 -- 6 Nonlinear feedback control to large scale systems using a distributed control system (DCS) device 247 -- 6.1 Introduction 247 -- 6.2 Multi-tank process modelling 249 -- 6.3 Robust right coprime factorization design and controller realization254 -- 6.4 Experimental results 260 -- 6.5 Summary 264 -- References 267