Automatic Tea/Coffee Maker – These machines also function for pre-adjusted time only.Bread Toaster – This machine runs as per adjusted time irrespective of toasting is completed or not.Automatic Washing Machine – This machine runs according to the pre-set time irrespective of washing is completed or not.Electric Hand Drier – Hot air (output) comes out as long as you keep your hand under the machine, irrespective of how much your hand is dried.Practical Examples of Open Loop Control SystemsĮxamples of open-loop control systems in daily life include: The figure below shows a control system block diagram of an open-loop control system in which process output is totally independent of the controller action. This system can further be improved by using a timer switching arrangement of the power supply where the supply to the heating element is switched on and off in a predetermined interval to achieve the desired temperature level of the room. This is an example of a manual control system. In this way, one can manually control the room temperature at the desired level. Suppose there is a simple heating element, which is heated up as long as the electric power supply is switched on.Īs long as the power supply switch of the heater is on the temperature of the room rises and after achieving the desired temperature of the room, the power supply is switched off.Īgain due to ambient temperature, the room temperature falls, and then manually the heater element is switched on to achieve the desired room temperature again. Let us take an example of the simple temperature controller of the room, to clear the concept. The system used for controlling the position, velocity, acceleration, temperature, pressure, voltage, and current, etc. There are various types of control systems, but all of them are created to control outputs. Automation requires control over systems of interacting devices. As human civilization is being modernized day by day the demand for automation has increased alongside it. In other words, the definition of a control system can be simplified as a system, which controls other systems. A control system achieves this through control loops, which are a process designed to maintain a process variable at a desired set point.
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