Fan control apparatus and fan control method

Abstract

A fan controlling apparatus for controlling a plurality of fans which are tandemly arranged in ventilation direction of a chamber to control a temperature of a hot generating object placed in the chamber, the apparatus includes a memory for storing data of the rotational speed each of fans in relation to the temperature of the heat generating object, and a controller for controlling the rotational speed of each of the fans respectively in dependence on the temperature of the heat generating object in reference to the data stored in the memory.

1 . A fan controlling apparatus for controlling a plurality of fans which are tandemly arranged in ventilation direction of a chamber to control a temperature of a hot generating object placed in the chamber, comprising:
 a memory for storing data of the rotational speed each of fans in relation to the temperature of the heat generating object; and   a controller for controlling the rotational speed of each of the fans respectively in dependence on the temperature of the heat generating object in reference to the data stored in the memory.   
     
     
         2 . The fan controlling apparatus according to  claim 1 , wherein
 the controller controls the rotational speed of each of the fans so that the difference of an actual rotational speed of each of the fans lower than predetermined value.   
     
     
         3 . The fan controlling apparatus according to  claim 1 , wherein
 the data that the memory stored are control parameters of each of the fans with respect to a plurality of the temperatures.   
     
     
         4 . The fan controlling apparatus according to  claim 3 , wherein
 the control parameters are respectively values of pulse width in accordance with the pulse width control of each fan, and   the parameters are respectively parameters corresponding to pulse width inputs to each of the fans.   
     
     
         5 . The fan controlling apparatus according to  claim 1 , wherein
 the controller controls the rotational speed of each of the fans so that the difference of an actual rotational speed of each of the fans lower than 10 percents.   
     
     
         6 . A fan controlling method for controlling a plurality of fans which are tandemly arranged in ventilation direction of a chamber to control a temperature of a hot generating object placed in the chamber, comprising:
 detecting the temperature of a hot generating object; and   controlling the rotational speed of each of the fans respectively in dependence on the temperature detected in reference to data stored in the memory, the memory storing the data of the rotational speed each of fans in relation to the temperature of the heat generating object.   
     
     
         7 . The fan controlling method according to  claim 6 , wherein
 the controlling controls the rotational speed of each of the fans so that the difference of an actual rotational speed of each of the fans lower than predetermined value.   
     
     
         8 . The fan controlling method according to  claim 6 , wherein
 the data that the memory stored are control parameters of each of the fans with respect to a plurality of the temperatures.   
     
     
         9 . The fan controlling method according to  claim 8 , wherein
 the control parameters are respectively values of pulse width in accordance with the pulse width control of each fan, and   the parameters are respectively parameters corresponding to pulse width inputs to each of the fans.   
     
     
         10 . The fan controlling method according to  claim 6 , wherein
 the controlling controls the rotational speed of each of the fans so that the difference of an actual rotational speed of each of the fans lower than 10 percents.   
     
     
         11 . A computer-readable recording medium storing a computer program controlling a plurality of fans which are tandemly arranged in ventilation direction of a chamber to control a temperature of a hot generating object placed in the chamber, the program being designed to make a computer perform the steps of:
 detecting the temperature of a hot generating object; and   controlling the rotational speed of each of the fans respectively in dependence on the temperature detected in reference to data stored in the memory, the memory storing the data of the rotational speed each of fans in relation to the temperature of the heat generating object.