What is the function of a control center in a feedback control system for homoeostasis?

A simple feedback loop to regulate a parameter is usually like this:








..(ignore the dots).d-|


..+............................\/


r-o---%26gt;[c]----%26gt;[p]------%26gt;y


- /\.......................|


....\____________|





where o is the summing junction and the lower loop is the sensor loop which gives the error signal





the c is the compensator, which boosts the weak input voltage and the p is the transfer function of the open system, (heater, lights, whatever is used to provide the change to the system), and y is the output (the homeostasis-ity if you will) d is an input that allows you to calibrate the system to perform correctly.


The return loop(the arrow on the bottom pointing back towards the input) is a system sensor usually, and it reads where the system is actually at, so, if say the heat was low, it would read negative, which is subtracted from the input(thus adding) which would give a higher input voltage, causing your system to heat faster, then the closer it gets to the correct temperature, the value it reads that is off of what you want gets lower, and when it reaches the correct setting, it goes to zero.








The short version is, you have a method of changing your temperature, your sensors read the current temperature, the control changes the temperature to this one.