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Flip to reveal answersWhat is the difference between an open- and a closed-loop system?
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All 4 Flashcards — Feedback
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Question
What is the difference between an open- and a closed-loop system?
Answer
An open-loop system acts on its input and nothing measures the result. A closed-loop system measures its output, feeds it back, compares it with what was asked and corrects the difference.
Question
What is the purpose of feedback?
Answer
To let the system correct for everything the designer could not predict — a cold room, a heavy load, a slipping wheel, a worn part. Accuracy is the consequence, not the purpose.
Question
Give two open-loop and two closed-loop products.
Answer
Open: a toaster on a timer, a doorbell, fixed-cycle traffic lights. Closed: an oven with a thermistor, a cruise control, a lift, a powered wheelchair with wheel encoders.
Question
Why can feedback make a system worse?
Answer
A loop that corrects too hard overshoots, corrects back and oscillates. A dead band and gentler correction are the usual fixes.
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Topic 3.4 hub
Electronic systems
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