| 摘要 |
PURPOSE:To make it possible to shorten the time to reach a most suitable overheating with a larger initially set opening if the temperature of sucked air in an evaporator is high and a smaller initially set opening if it is low by providing a control circuit which changes an initially set opening of a flow rate control valve according to the temperature of the sucked air in an evaporator. CONSTITUTION:Outputs from a temperature sensor C which are digitized by an A/D converter 7 are led to arithmetic means 12, where the temperature difference T between the temperature T1 of the sucked air in an evaporator 4 and a set temperature T0 is calculated, and at the same time the initial valve opening for flow rate control valve 3 corresponding to this temperature difference T is calculated. And the result of the calculation is outputted from an output converter 11 to a valve 3 through set signal generating means 13 to set an initial opening of the valve 3. After this outputs from temperature sensors A and B which are digitized by an A/D converter9 are led to the arithmetic means 12 to calculate the difference SH of temperatures of the inlet and outlet in an evaporator 4 and at the same time the difference between the temperature difference SH and the set temperature difference SHO is calculated. The result of this calculation is outputted to judgement means 13 and an air conditioner is controlled so as to bring the temperature different SH closer to the set value SHO.
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