Patent ID: 8256238

Claim:
An air conditioning system for a vehicle, comprising: a refrigerant cycle device which has an evaporator and a compressor and in which refrigerant is discharged from the compressor to be evaporated in the evaporator so that air passing through the evaporator is cooled to be blown into a passenger compartment of the vehicle; and a control unit which calculates a control value for determining a driving output of the compressor to control an operation of the compressor, wherein the control unit determines whether the compressor is in an initial driving time only after power has initially been supplied to the control unit and the compressor has not been actuated after the power has initially been supplied to the control unit; the control unit determines the control value based on a pressure of the refrigerant in the refrigerant cycle device, only when the compressor is determined to be in the initial driving time after the power has initially been supplied to the control unit and wherein the control unit drives the compressor by the determined control value when the control unit actuates the compressor after the initial driving time after the power has initially been supplied to the control unit, and the control unit determines the control value based on a difference in a target air temperature and an actual air temperature at a downstream side of the evaporator, when the control unit has actuated the compressor after the initial driving time and the power is still being supplied to the control unit.