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A refrigeration cycle or an air conditioner including a refrigeration cycle is subjected to feedback control based on modern control theory. An apparatus controlling a controlled object, that is, the refrigeration cycle of the air conditioner including the refrigeration cycle, is formed as an optima

A refrigeration cycle or an air conditioner including a refrigeration cycle is subjected to feedback control based on modern control theory. An apparatus controlling a controlled object, that is, the refrigeration cycle of the air conditioner including the refrigeration cycle, is formed as an optimal regulator. A controlled input to the controlled object includes a capacity of a compressor or a degree of opening of an expansion valve. A control output from the controlled object includes a temperature of air at a point downstream of the evaporator or a superheat of refrigerant. Feedback gains are predetermined by use of dynamic models constructed for respective steady operation states of the controlled object.

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A control apparatus for a refrigeration arrangement including a heat exchanger and a compressor, the heat exchanger being disposed within an air duct having a downstream end opening into an interior of a vehicle, the compressor having a variable capacity, the control apparatus comprising: (a) means

A control apparatus for a refrigeration arrangement including a heat exchanger and a compressor, the heat exchanger being disposed within an air duct having a downstream end opening into an interior of a vehicle, the compressor having a variable capacity, the control apparatus comprising: (a) means for detecting a physical quantity related to a condition of heat exchange of the heat exchanger; (b) means for setting a target value of the physical quantity; (c) means for calculating a difference between the detected physical quantity and the target value; (d) means for calculating a perturbation component of the detected physical quantity which is measured from a steady value of the physical quantity being predetermined relative to a dynamic model; (e) means for calculating a perturbation component of the compressor capacity on the basis of the difference, the physical quantity perturbation component, and a feedback gain, formed as an optimal regulator based on dynamic models which represent a relationship among the compressor capacity and the physical quantity in terms of perturbation components measured from respective steady values occurring when the refrigeration cycle operates under the steady states; (f) means for adding the compressor capacity perturbation component and a compressor capacity steady value being predetermined relative to the dynamic model; (g) means for adjusting the compressor capacity to the output of the adding means; and (h) means for changing the physical quantity steady value, the feedback gain and the compressor capacity steady value in accordance with a change in an operation condition of the refrigeration cycle, the physical quantity steady value, the feedback gain and the compressor capacity steady value being changeable among values predetermined for respective steady states.