Patent attributes
There is disclosed a vehicle air conditioner in which in a dehumidifying and heating mode, a heating capability by a radiator can be acquired while avoiding frost formation to a heat absorber. A dehumidifying and heating mode is executed in which a refrigerant discharged from a compressor 2 radiates heat in a radiator 4, the refrigerant by which heat has been radiated is decompressed, and then heat is absorbed in a heat absorber 9 and an outdoor heat exchanger 7 or only in the heat absorber 9 to heating a vehicle interior while dehumidifying the vehicle interior. The vehicle air conditioner includes an injection circuit 40 which distributes a part of the refrigerant flowing out from the radiator 4 to return the part to the compressor 2. In the dehumidifying and heating mode, a controller 32 operates the injection circuit 40 in a case where there is established a predetermined heating capability shortage condition on which a heating capability runs short, a predetermined dehumidifying capability excess condition on which a dehumidifying capability becomes excessive or a predetermined low outdoor air temperature startup condition on which startup is made at a low outdoor air temperature.
