Closed-Loop Control System
A closed-loop control system is a system in which the control action is somehow dependent on the output. The primary objective of a closed-loop control system is to enhance the system’s stability, accuracy, and overall performance. A simple example of a closed -loop control system is a home thermostat. The thermostat can send a signal to the heater to turn it on or off. It uses a temperature sensor to detect the current air temperature.
This system is used to maintain a setpoint without human interaction so it does it on its own. This system is also called the feedback controller because it has a feedback loop that performs the action to control a process variable same as the setpoint, i.e. the feedback where some section of the output signal fed back to the input section to reduce errors and maintain the stability in the system.
Examples: Automatic electric iron, missile launcher, speed control DC motor, etc.
Traffic lights control system is an example of control system. Here, a sequence of input signal is applied to this control system and the output is one of the three lights that will be on for some duration of time. During this time, the other two lights will be off. Based on the traffic study at a particular junction, the on and off times of the lights can be determined. Accordingly, the input signal controls the output. So, the traffic lights control system operates on time basis.
The error detector produces an error signal, which is the difference between the input and the feedback signal. This feedback signal is obtained from the block (feedback elements) by considering the output of the overall system as an input to this block. Instead of the direct input, the error signal is applied as an input to a controller. So, the controller produces an actuating signal which controls the plant. In this combination, the output of the control system is adjusted automatically till we get the desired response. Hence, the closed loop control systems are also called the automatic control systems. Traffic lights control system having sensor at the input is an example of a closed loop control system.
Closed-Loop Control System is used in applications where feedback and error handling are required. It is a complex system and not economical but optimization is possible. Maintenance of CLCS is difficult.
Closed-Loop Control System
In this article, we’re going to discuss about closed loop control system. A closed-loop control system is an electronic device that automatically regulates a system to maintain a desired state or set point without human interaction. The advantages of closed-loop control systems lie in their ability to provide precision, stability, and resilience, making them indispensable in numerous technological advancements and industrial processes. The term “closed-loop” reflects the feedback loop that is established, where the output is fed back to the system’s input for constant monitoring and correction.
Table of Content
- Closed-Loop Control System
- Operation
- Components
- Types of Feedback
- Applications
- Advantages and Disadvantages