Closed Loop System

Closed Loop System
Closed Loop System

An important instrument in industrial control is a Closed Loop System , where the output determines the input. This is different from an open-loop system, where input controls output regardless of environmental circumstances. Closed loop and open loop are often used interchangeably with feedback and feed forward. Whereas “feedback” involves sending input to the system based on its output, “feed forward” does not. Closed-loop systems are seen in our air conditioners and automatic car speed regulators.

Do you ever feel stuck in the same routine day after day? An open loop system may be right for you. With no new inputs or outputs. How about breaking that cycle? Can system outputs be used as inputs to generate something new? Closed loop systems help. These systems alter future actions based on feedback. Closed loop systems automatically correct outputs to balance a checkbook, regulate room temperature, or achieve other goals. This beginner’s guide will explain how self-regulating systems work so you can streamline your own procedures. We can get out of those ruts by closing the circle!

What Is a Closed Loop System?

A closed loop system is self-regulating since its outputs affect its inputs. In a closed loop system, process outputs are measured and considered input. A feedback loop lets the system change its performance to get the desired results.

The feedback loop lets the system adapt to changes and optimize performance.
Self-regulating closed loop systems use feedback to produce stability and the desired result.
They operate without human assistance after initial parameters are specified.

Common closed-loop systems include:

  • Thermostats measure room temperature and trigger the heating/cooling system to reach the set point. To avoid overshooting, the thermostat lowers heating/cooling when the temperature near the set point.
  • Cruise control measures vehicle speed and adjusts power to maintain driver-set speed. Cruise control automatically brakes if the car speeds up down a hill.
  • pH regulators measure acidity and distribute chemicals to modify pH. They constantly monitor pH and add acid/base to maintain optimal pH.
  • Autopilots measure speed, altitude, and direction to control an aircraft’s flying surfaces and course. They constantly adapt for wind and other disturbances.
  • Many science, engineering, and technology fields use closed loop systems for automated control and regulation. These concepts help create self-regulating and adaptable systems. In complicated situations, closed loop systems can maximize performance via sensors and algorithms.

Types of Closed Loop Systems

Common configurations of closed loop systems exist. The three primary types are:

Open Loop System

The simplest system is open loop. It can’t adapt to changing situations because it has no feedback loop. It follows its designated path once started. Without self-correction, open loop systems are rarely employed for precision tasks.

Closed Loop System

Closed loop systems modify themselves using feedback. It compares its output to the required output and adjusts to minimize the discrepancy. Performance is more accurate and steady. Closed loop systems are ideal for precise applications.

PID Controller

A closed loop PID controller utilizes an algorithm to automatically adapt and stabilize a process. PID means “proportional, integral, derivative.” The controller monitors output and corrects for three factors:

Proportional—Output difference from desired. Greater difference, stronger correction.
Integrated difference throughout time. This reduces errors.
Derivative: Difference change rate. Stabilizing the system reduces overcorrection.
A PID controller can accurately manage temperature, pressure, flow rate, and speed by tweaking these three elements. Many automated control systems and gadgets use PID controllers.

In conclusion, closed loop systems provide input for self-correction and high accuracy. Specific closed loop systems depend on the precision and control needed for your application. With tuning, closed loop control may be strong and ensure quality and efficiency.

Components of a Closed Loop System

Closed loop systems recycle the same material. ###Reservoirs Tanks, or reservoirs, contain materials between processing operations. They vary in size to suit your demands. Material is temporarily saved here during looping.

Pumps mobilize materials between components using mechanical energy. They transfer material through pipes and tubes in the closed loop. Centrifugal, positive displacement, vacuum, and metering pumps exist. Consider material viscosity, flow rate, and installation when choosing a pump.

Pipes and Tubes

Tubes and pipes transmit materials between components. Chemical qualities are used to choose them to prevent corrosion and leakage. Controlling direction and joining pipes via valves and connectors.


Sensors measure system pressure, temperature, flow rate, pH, and chemical composition. They give data for optimal operation and early problem detection. Pressure transducers, thermocouples, flow meters, and analyzers are common.


In closed-loop systems, controllers automate and maintain optimal conditions. They adjust pumps, valves, and heaters using sensor data. Advanced “smart” controllers optimize the system using algorithms and machine learning, whereas basic controllers use preset conditions.

Additional Components

Other components including heat exchangers, filters, reactors, and distillation columns aid heating/cooling, purification, and chemical reactions. Customized for each use.

You can optimize and troubleshoot your closed loop system by understanding its core components and how they work. Using high-quality, interoperable components and a balanced design centered on circulation and reuse is crucial.

Advantages of Using a Closed Loop System

A closed loop system has advantages over an open one.

Reduced Waste

A closed loop system recycles and reuses materials, reducing waste. Instead of releasing water, nutrients, and energy, the system recycles them. This resource efficiency improves the environment and cuts costs.

Improved Process Control

Closing the loop increases process control. Temperature, pH, and flow rate can be monitored and changed. This improves quality and consistency. Automation reduces human error in closed systems.

Higher Productivity

Reusing materials, water, and energy lets closed systems run continually. Continuous processing increases output and productivity. Self-sustaining systems reduce downtime.

• Lower expenses: Reusing resources reduces raw material, energy, and disposal expenses. More automation reduces labor costs. Lower costs can reflect these savings.

Pollution is reduced by containing resources within the system. This reduces acid rain, eutrophication, and greenhouse gas emissions. A business’s environmental footprint is reduced by this sustainable approach.

•Safer: Closed loop systems reduce dangers. This containment protects workers and the environment. Automation takes harmful duties from individuals.

Transitioning to a closed loop system benefits businesses and the environment. High initial expenditures, but long-term advantages to the triple bottom line—people, planet, and profit—make it worthwhile.

Applications of Closed Loop Systems

Closed loop systems have many practical uses. These are some of their main applications:

Temperature regulation

An example of a closed loop temperature regulator is a thermostat. They monitor your home’s temperature and notify the heating/cooling system to turn on or off to maintain it. Temperature sensor feedback tells thermostat whether it needs to change to attain desired temperature.


Many robots move and behave using closed loop systems. Their sensors report the robot’s position, speed, and orientation. The robot’s control system then determines if its motors or actuators need to be adjusted for smooth and precise mobility and operation.

Autopilot systems

Aviation autopilots use closed loop control to direct and steady planes. Sensors measure altitude, airspeed, and heading for the autopilot computer. To maintain the plane’s speed and altitude, it continuously adjusts the ailerons and rudder. Sensor feedback keeps the autopilot making modest modifications.

Process control

Automatically controlling chemical production, electricity generation, and manufacturing with closed loop systems is common in industry. Sensors monitoring the process tell actuators whether they need to adjust to keep temperature, pressure, flow rate, and chemical composition within limitations. This optimizes the process and ensures output quality.

Closed-loop systems monitor feedback and modify to maintain a desired condition or set point to automate system and process regulation. Many technologies that demand precise control use them.


Closed loop system basics in a nutshell. We discussed the essential components, their interactions, and their importance for operations. You should now understand these systems, what they do, and why they’re so important across sectors. You’re ready to investigate closed loops in your business or function with this foundation. Understanding is the first step to CLS, so congrats on leveling up. Now go, learn, and use your information to better!

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