Abstract: In an automotive automatic air conditioning system having at least a variable displacement compressor, a condenser, an expansion valve, and an evaporator; an improvement comprising a refrigerant temperature sensor disposed between the outlet of the expansion valve and the inlet of the evaporator for detecting a refrigerant temperature, and a controller for setting a target refrigerant temperature are disclosed. The controller controls the discharge of refrigerant from the compressor such that the refrigerant temperature reaches the target refrigerant temperature. Thus, the system provides optimum dehumidification under conditions of high humidity and relatively low ambient temperature, such as a rainy spell in autumn.

Abstract: An automotive air tempering apparatus for use in an automotive vehicle having a duct through which air is directed into a passenger compartment. The apparatus comprises an air chilling unit including an evaporator provided in the duct and a compressor having a displacement variable for supplying a controlled amount of refrigerant to the evaporator for chilling the air in the duct. A control unit controls the displacement of the compressor to bring the refrigerant temperature to a target value when air is introduced into the duct from the atmosphere. The control unit controls the displacement of the compressor to bring the chilled air temperature to a target value when air is introduced into the duct from the passenger compartment.

Abstract: An air tempering apparatus for use in an automotive vehicle having a duct through which air is directed into a passenger compartment. The apparatus comprises an air chilling unit having a variable refrigerating capacity of chilling the air in the duct, and an air reheating unit having a variable reheating capacity of reheating the chilled air in the duct. A control unit decreases the reheating capacity of the air heating unit as the chilled air temperature increases. The control unit decreases the refrigerating capacity of the air chilling means when the reheating capacity of the air reheating means is greater than a predetermined value and when the sensed humidity is less than a predetermined value.

Abstract: An automatic air conditioning system for automotive vehicles with a variable displacement compressor comprises a sensor for detecting an intake air temperature of air flowing through the evaporator placed just behind the evaporator, a control valve for the compressor essentially changing the discharge of said compressor on the basis of the difference between the intake air temperature and its target value, and a CPU for changing the target value of the intake air temperature. When the CPU does not receive a signal indicative of a requirement for quick-cooling, the target value is set to a freezing start possible temperature defined by an intake air temperature such that the freezing of the evaporator starts, and when the CPU receives the signal indicative of a requirement for quick-cooling, the target value is set to a predetermined temperature lower than the freezing start possible temperature.