Grey Control Systems

Abstract

As a scientific concept, the so-called control stands for a special effect a controlling device exerts on controlled equipment. It is a purposeful and selective dynamic activity. A control system contains at least three parts, including a controlling device, controlled equipment, and an information path. A control system that is made up of only these three parts is known as an openloopcontrolsystem, as shown in Figure 9.1. Each open loop control system is quite elementary, in which the input directly controls the output, with the fatal weakness that it does not have any resistance against disturbances.