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With feed-forward or feedforward control, the disturbances are measured and accounted for before they have time to affect the system. In the house example, a feed-forward system may measure the fact that the door is opened and automatically turn on the heater before the house can get too cold.
A feed forward is not just a pre-feedback, as a feedback is always based on measuring an output and sending respective feedback. A pre-feedback given without measurement of output may be understood as a confirmation or just an acknowledgment of control command.
Feed forward is a type of element or pathway within a control system. Feedforward control uses measurement of a disturbance input to control a manipulated input . This differs from feedback, which uses measurement of any output to control a manipulated input.
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Image credits: milwbrewsox #7. My wife and I have this ceiling fan/light in our bedroom in the house we moved into two years ago. It has a remote control for the fan and lights.
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Feed-forward control computes its input into a system using only the current state and its model of the system. It does not use feedback, so it cannot correct for errors in its control. In feedback control, some of the output of the system can be fed back into the system's input, and the system is then able to make adjustments or compensate for ...
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