Patent ID: 6978632

Claim:
An air conditioning system for a vehicle comprising: a hybrid compressor comprising a first compression mechanism driven by a drive source for driving said vehicle and a second compression mechanism driven by an electric motor; means for selecting a drive source for said compressor and switching the drive source; means for detecting a condition of a refrigeration cycle when said compressor is driven; and means for estimating a power consumption of said compressor due to a selected drive source in response to a value detected by said means for detecting a condition of the refrigeration cycle, when either said drive source for driving said vehicle or said electric motor is selected as said drive source for said compressor by said means for selecting a drive source, wherein, in response to said power consumption of said compressor due to said selected drive source, which consumption power is estimated by said means for estimating a power consumption, a power consumption of said compressor due to a non-selected drive source for generating substantially the same level of a cooling ability as that due to said selected drive source is estimated.