Another example of a closed-loop control system can be found in newer models of clothes dryers. These dryers contain sensors that detect the relative humidity as clothes are drying. In this example of a closed-loop control system, the error state would be the sum of the desired dryness minus the measured dryness. This error is continually fed into the controller to make the necessary corrections in the plant, which reduces the error on the next iteration. This process continues until the clothes are dry, and the controller stops the plant.
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