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AS Level     Control Systems     >Feedback<    

Control Systems Feedback


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  AS Level    Control Systems  0 of 22    Question 233    Closed Loop Control 
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Deadline not set1 of 22    Question 801    Feedback 
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Deadline not set2 of 22    Question 802    Feedback 
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Deadline not set3 of 22    Question 803    Feedback 
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Deadline not set4 of 22    Question 720    Feedback 
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Deadline not set5 of 22    Question 787    Open and Closed Loop 
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Deadline not set6 of 22    Question 788    Open and Closed Loop 
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Deadline not set7 of 22    Question 804    Open and Closed Loop 
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Deadline not set8 of 22    Question 805    Open and Closed Loop 
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Deadline not set9 of 22    Question 806    Open and Closed Loop 
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Deadline not set10 of 22    Question 807    Open and Closed Loop 
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Deadline not set11 of 22    Question 808    Open and Closed Loop 
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Deadline not set12 of 22    Question 809    Open and Closed Loop 
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Deadline not set13 of 22    Question 231    Open and Closed Loop 
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Deadline not set14 of 22    Question 232    Open and Closed Loop 
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Deadline not set15 of 22    Question 1011    Subsystems 
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Deadline not set16 of 22    Question 1012    Subsystems 
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Deadline not set17 of 22    Question 1013    Subsystems 
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Deadline not set18 of 22    Question 1014    Subsystems 
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Deadline not set19 of 22    Question 1015    Subsystems 
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Deadline not set20 of 22    Question 1019    Subsystems 
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Deadline not set21 of 22    Question 1020    Subsystems 
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Deadline not set22 of 22    Question 1021    Subsystems 
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Deadline not set  Questions 0 to 22   -->  View All  

Control systems often include negative feedback.
Negative feedback is a good thing. It corrects errors in the output.
Systems that include 
negative feedback are called CLOSED LOOP.
Systems with no feedback are called OPEN LOOP.

Input Process Output plus Feedback

More Detailed Example - Central Heating and Thermostst

General Layout of a Control System

A - Input.
B - Error Detector. Compare wanted with actual temperature (analogue comparator or digital subtraction)
C - Processor decides what to do with the signal from B
D - Driver (to change the boiler settings and water pump state)
E - Room thermostat
F - Negative Feedback voltage or binary number

P - The user sets the input required room temperature
Q - A voltage or binary number representing the wanted temperature
R - Error signal representing the difference between the wanted and actual room temperature.
S - Control signal/s to the boiler for the gas burner and water pumping
T - Cool or warm air carries this signal from the heating system to the thermostat.
U - The room temperature as sensed by people.
V - A voltage or binary number representing the actual temperature
W - This could be identical to V or a scaled or processed version of V suitable to be fed to B.

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