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Process Control: Modeling, Design, and Simulation by B. Wayne Bequette

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6.1. Introduction

Consider the standard feedback block diagram shown in Figure 6-1, where disturbance inputs have been neglected. Transfer functions (and block diagrams) are used to analyze the behavior of control systems, because the algebraic expressions are easy to manipulate.

Figure 6-1. Feedback control block diagram.

We noted in Chapter 5 that the closed-loop transfer function could be used to determine, for example, the range of controller gains that assure closed-loop stability.

PID Controller Forms

PID controller algorithms were developed in Chapter 5. Here we provide a concise review of the algorithms in common use.

P-Only Control

The ...

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