ROAD HEATING CONTROL DEVICE

PURPOSE:To efficiently control a heat source by obtaining respective membership functions of both the grade of the intensity of snowfall and the grade of outside air temperature, and on the basis of the respective grades, by obtaining the remaining snow treating time by the functions, so that the heat source can be controlled. CONSTITUTION:A signal is input into a snowfall control circuit 4 through an input terminal 1 for inputting the presence of water due to snowfall, and when it is judged that there is water, a signal is output into a grade calculating circuit 8 through the circuit 4. Further, a signal is inputted into a grade calculating circuit 5 through an input terminal 2 for inputting the outside air temperature, and also a signal is input into a grade calculating circuit 6 through a snowfall intensity input terminal 3. The circuits 5, 6 obtain the respective grades by respective membership functions respectively, and output them into a composite circuit 7. Then, the circuit 7 outputs a composite signal in which two grades have been compounded into a circuit 8. The circuit 8 obtains the remaining snow treating time by the membership function thereof, and outputs it into a heat-source control circuit 10. The heat-source control circuit 10 controls road heating for melting snow.