FanSpeed-Fuzzy-demo

Demo of a Fuzzy Logic-based CPU Fan Speed Controller

MATLAB

The aim is to control the CPU Fan Speed based on the system’s current core temperature (in degrees Celsius) and current clock speed (in GHz).

The ranges used are calibrated based on the current computer models, thus these ranges are subject to change as time pass by. The ranges are as follows:

Fuzzy Variables	Units	Ranges (based on 2016 computer models)
Core temperature	degrees Celsius (°C)	0 to 100
Clock speed frequency	Gigahertz (GHz)	0 to 4
Fan speed	Revolutions per minute (RPM)	0 to 6000

Fuzzy Membership Functions

Core Temperature

Clock Speed

Fan Speed

Fuzzy Rules

Core Temperature		Clock Speed		Fan Speed
cold	AND	low	THEN	slow
cold	AND	normal	THEN	slow
cold	AND	turbo	THEN	fast
warm	AND	low	THEN	slow
warm	AND	normal	THEN	slow
warm	AND	turbo	THEN	fast
hot	AND	low	THEN	fast
hot	AND	normal	THEN	fast
hot	AND	turbo	THEN	fast

Simulation

>> fan_speed_demo
table_ = 
    core_temps    clocks    fan_speeds
    __________    ______    __________
    80            3.5       4715.8    
    75            1.5       4654.3    
    25            1.2       1367.8    
    90            3.8       4811.5    
>>