Control Systems Introduction
A Control System is a system in which the output is controlled by varying the input. The first control system device was James Watt's Flyball governor, which was invented in 1767. The aim of inventing Flyball governor was to keep the speed of the engine constant by regulating the supply of the steam to the engine.
In a control system, the behavior of the system is described by the differential equations. The differential equations can be either ordinary differential equations or the difference equations.
There are two types of control system:
Open loop control system
An open-loop control system is a system in which the control action is independent of the desired output signal. In this system, the output signal is not compared with the input signal which means there is no feedback signal in this system. The open-loop control system is also known as a non-feedback control system or control system without feedback.
Advantages of an open-loop control system
Disadvantages of open loop control system
Closed loop control system
A closed loop control system is a system in which control action is dependent on the desired output. In this system, the output signal is compared with the reference input signal, and an error signal is produced then this error signal is fed to the controller to reduce the error to obtain the desired output.
Advantages of closed-loop systems
Disadvantages of closed-loop systems
Difference between an open-loop system and closed-loop system