If no difference is found between the two temperatures a control signal is generated to stop the flow of steam. The pressure thermometer measures the temperature of the water at the outlet and compares it with the reference input value. This steam is mixed with the water and the water is moved towards the outlet. When a reference input is provided, the valve generates a control signal that indicates the system to generate the required amount of steam. A pressure thermometer is used as feedback for this system. In this system water is provided with a constant flow to the system, the internal valve is used to generate steam that is mixed with water to maintain the desired temperature of the water. The main aim of the system is to maintain the constant temperature of the water. Some of the basic examples of this control system are Automatic Iron System, Temperature control system, etc… This reduces the gain of the overall system. Here the reference signal is subtracted from the feedback signal to get the error signal. In this type of control system, the feedback signal is out of phase with the input signal. This increases the overall gain of the control system. Here, the reference signal is added to the feedback signal. In this type of control system, the feedback signal is in in-phase with the input signal. They are a Closed-Loop control system with Negative feedback and a Closed-Loop control system with Positive Feedback. The aim is to maintain the value of the process variable the same as that of the setpoint value.Ĭ(S)/R(S) = G(S)/, this is for the Characteristics function of a closed-loop control system with negative feedbackĬharacteristics equation of a closed-loop control system with positive feedback is given as:Ĭ(S)/R(S) = G(S)/ Different Typesīased on the feedback loop of the closed-loop control system, they are classified into two types.

Here, the operation of the controller is monitored and controlled using a feedback loop. What is a Closed-Loop Control System?Ĭlosed- Loop control systems are also known as Feedback Controllers. One of the classifications of the control system is the Closed-loop control system.

Hence, the systems that do not follow the homogeneity principle are known as Non-linear Control systems. The control system that follows the principle of homogeneity and additivity is known as Linear control system. Control systems are classified as Linear control systems and Non- Linear control systems, Analog or continuous systems, Digital or Discrete systems, single input single output systems, Multiple inputs multiple-output systems, etc. Apparently, it is a system that controls other systems. A Control system is a method of connecting devices so that we can manage, direct and control the behavior of other devices using control loops.

Closed loop transfer function