What are Control Systems and What are its Types?

Control is crucial for keeping an eye on the outcome of systems as well as is exercised through control loops. It is needed for keeping an eye on the preferred output of a system with the real outcome to ensure that the performance of the system can be gauged and corrective action taken if called for. There are four elements required for effective control:

  • A control variable is a variable whose worth would establish the degree of performance of the system.
  • A detector is to keep track of the output of the system by gauging the control variable parameters.
  • A comparator is to contrast the actual as well as the scheduled result of the system.
  • An effector is to make suitable modifications.

Types of Control

There are two types of Control mechanisms: feedback control and feed forward control.


  • Feedback Control


When we have a control framework in which the result is used to modify the inputs directly, we call that as a feedback control mechanism. Feedback control can itself be of two kinds: 

  • Positive Feedback: Positive feedback is when the output of a system is positively correlated with the input, i.e., more output motivates even more input or less motivates lesser input. For example, a stock exchange often shows positive feedback. Positive feedbacks typically indicate an unstable system unless there is an outdoors device to stop the process past a point. 
  • Negative Feedback: Negative feedback, on the other hand, is the reverse of positive feedback in the feeling that in negative feedbacks, the connection in between output and input is adverse. 


  • Feed Forward Control


This is a sort of control mechanism to deal with the trouble of system oscillation. In this kind of control system, the control is exercised after anticipating the result. As well as if the forecast concerning the outcome is that it will go across the steady limit or the target after that control devices are used prior to the target worth or control worth of the control variable is attained lowering the system automatically listed below the threat restriction. As an example, if in our automobile a smart braking system is regulated by computer system then whenever the automobile would cross fifty-eight km per hour, automatic brakes would be used irrespective of whether the motorist applies brakes or otherwise reducing the speed to the desired level. This is called feedforward system also it works on an aggressive approach instead of that the responsive ideologies of a feedback control mechanism. However, to apply the feedforward control device, we require having a total understanding of the system.

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