| 摘要 |
<p>PURPOSE:To control a liquid temperature most suitably by giving power to a heater until the rise becomes the first set value and adding outputs of an air temperature sensing element and a heater temperature sensing element with weights inversely proportional to respective coefficients of temperature in a normal proportional control to obtain a differential output between this added value and the second set value. CONSTITUTION:Resistances 11, 12, a resistance 13, a temperature sensing element 14 which detects the temperature of the heater, a resistance 15, and a temperature sensing element 16 which detects the air temperature are connected in series to a power source +V, and one ends of the resistance 12 and elements 14 and 16 are grounded. The coefficient of temperature of the element 16 is set to a value higher than that of the element 14, and outputs of elements 16 and 14 are added with the same weights. Then, power is supplied to the heater until the addition output becomes a prescribed first set value, and the rise temperature of a liquid is controlled. When the addition output exceeds the set value, outputs of elements 16 and 14 are added with weights inversely proportional to respective coefficients of temperature, and power is given to the heater on a basis of the differential output between the added value and the second set value to control the temperature of the liquid.</p> |
