| 摘要 |
PURPOSE:To make stability in temperature control at time of stationariness compatible with that of transition by installing a device which calculates the function conformed to the absolute value of a difference between the detected value of temperature and the desired value, and increasing or decreasing a feedback gain in a control system according to this function. CONSTITUTION:A capacity variable mechanism 13 is installed in a refrigerant compressor 12 to be driven by an engine 11. And, an output refrigerant out of this refrigerant compressor 12 is fed back to the refrigerant compressor 12 by way of an evaporator 17 after being fed to an expansion valve 16 via a condenser 14 and a receiver 15. At this time, the detected temperature out of a temperature sensor 19 and the setting temperature out of a temperature setting part 21 are inputted each into a controller 20, and thereby a duty ratio of a signal to be fed to the capacity variable mechanism 13 is operated. And, when a deviation between the detected temperature and the setting temperature is, for example, large enough, capacity of the refrigerant compressor 12 is set to be larger. That is to say, a feedback gain in a control system is increased or decreased according to size of the temperature deviation. |
