Applications of Inferential Control

There are many processes that need inferential control because of the unfeasibility of primary variable measurement for one reason or the other.

Inferential Control - An Introduction

Introduction

Inferential control is a control scheme in which the controlled variable (primary process variable) is not measured directly but estimated from a secondary measurement.

Self-Adaptive Control

Introduction

The Self-Adaptive Control is one of the major types of adaptive control. It is comparable to feedback compensation because the adaptation of controller parameters is based on the measurement of closed-loop performance and aim to optimize it by using a reference model of the process or by estimation techniques.

Programmed or Gain Scheduled Adaptive Control

Programmed or Gain Scheduled Adaptive Control

The Programmed Adaptive Control is one of the major and important adaptive control mechanisms. The Programmed Adaptive Control adjusts the controller parameters based on the measurement of an auxiliary variable

ADAPTIVE CONTROL - AN INTRODUCTION

Adaptive Control

Adaptive control detects the changes in the characteristics of the process and adjusts the controller parameters automatically to compensate for the changing conditions of the process and in turn to optimize the loop response.

OVERRIDE CONTROL

Override Control

Override Control, also called as selective control, is a form of multivariable control in which more than one controller can manipulate the same process and the selection of controller is determined by a constraint.

FEEDFORWARD CONTROL

FEEDFORWARD CONTROL

Feedforward control provides a direct solution to the control problem by measuring the disturbances and compensating the controlled variable before it deviates from the set point. Feedforward control or Open loop control is one of the basic automatic control strategies.

FEEDBACK CONTROL

Feedback control

Feedback control is a control action of altering the manipulated variable in response to the deviation between the controlled variable and its set point in such a way to eliminate the deviation.

CASCADE CONTROL

Cascade Control 
Cascade control is a multiple loop control configuration, like the override control which involves more than one measurement and one manipulation. In the cascade configuration, there are two control loops to manipulate one process variable.

RATIO CONTROL

Ratio control systems are special form of feedforward control systems where two variables are measured and maintained at a constant ratio in order to control a third variable. Ratio control is applied to keep up certain ratio between two or more flow rates in process industries.

FEEDFORWARD CONTROL vs FEEDBACK CONTROL

Feedforward control and feedback control are the two predominant process control systems used in industries. Let's check the differences that exist between the feedforward and feedback control.