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Examples include air conditioners, refrigerators, automatic rice cookers, automatic ticketing machines, etc. An air conditioner, for example, uses a thermostat to detect the temperature and control the operation of its electrical parts to keep the room temperature at a preset constant.

Examples include air conditioners, refrigerators, automatic rice cookers, automatic ticketing machines, etc. An air conditioner, for example, uses a thermostat to detect the temperature and control the operation of its electrical parts to keep the room temperature at a preset constant.

Open Loop and Closed Loop Control Systems Open Loop Control SystemsClosed Loop Control SystemsControl action is independent of the desired output.Control action is dependent of the desired output.Feedback path is not present.Feedback path is present.4 more rows

They are: proportional, integral, and derivative. These control methods may be used singly or in combinations in applying automatic control to a process, depending upon the complexity of the process and the extent of control required.

Examples of control systems in your day-to-day life include an air conditioner, a refrigerator, an air conditioner, a bathroom toilet tank, an automatic iron, and many processes within a car – such as cruise control.

Open-loop and closed-loop control Fundamentally, there are two types of control loop: open-loop control (feedforward), and closed-loop control (feedback). In open-loop control, the control action from the controller is independent of the "process output" (or "controlled process variable").

Feedback controls are widely used in modern automated systems. A feedback control system consists of five basic components: (1) input, (2) process being controlled, (3) output, (4) sensing elements, and (5) controller and actuating devices. These five components are illustrated in Figure 1.