Method for optimizing control parameters of cooling fan and system thereof

A method for optimizing control parameters of a cooling fan comprising:

• setting a temperature point of the cooling fan according to a plurality of temperatures corresponding to a plurality of first consecutive time intervals;
• controlling a duty cycle of the cooling fan according to the temperature point;
• acquiring temperature variation data of the cooling fan during a plurality of second consecutive time intervals, wherein the plurality of first consecutive time intervals are followed by the plurality of second consecutive time intervals;
• generating a gain factor and a frequency factor of the cooling fan according to the temperature variation data;
• and
• generating a proportional gain factor, an integral time factor and a derivative time factor of a proportional-integral-derivative controller of the cooling fan according to the gain factor and the frequency factor of the cooling fan;
• wherein controlling the duty cycle of the cooling fan according to the temperature point, acquiring the temperature variation data of the cooling fan during the plurality of second consecutive time intervals, and generating the gain factor and the frequency factor of the cooling fan according to the temperature variation data comprise:
• subtracting an offset from the temperature point to generate an initial temperature point;
• setting a high duty cycle and a low duty cycle of the cooling fan;
• acquiring a temperature of the cooling fan in each time interval of the plurality of second consecutive time intervals;
• controlling the duty cycle of the cooling fan to operate in the low duty cycle and storing the temperature variation data to a memory device if the temperature is smaller than the initial temperature point;
• controlling the duty cycle of the cooling fan to operate in the high duty cycle and storing the temperature variation data to the memory device if the temperature is greater than the initial temperature point;
• and
• generating the gain factor and the frequency factor according to the temperature variation data of the plurality of second consecutive time intervals.