Vehicle air conditioner

A vehicle air conditioner comprising:

• a compressor to compress a refrigerant,
• an air flow passage through which air to be supplied to a vehicle interior flows,
• a radiator to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior,
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior,
• an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb heat,
• an outdoor expansion valve to decompress the refrigerant flowing into the outdoor heat exchanger,
• a bypass circuit connected in parallel with a series circuit of the outdoor heat exchanger and the outdoor expansion valve,
• an indoor expansion valve to decompress the refrigerant flowing into the heat absorber,
• an auxiliary heating device to heat the air to be supplied from the air flow passage to the vehicle interior, and
• a control device,
• so that the control device lets the refrigerant discharged from the compressor radiate heat in the radiator, distributes the refrigerant from which the heat has been radiated, lets a part of the refrigerant flow into the heat absorber from the bypass circuit through the indoor expansion valve, lets the refrigerant absorb heat in the heat absorber, lets the residual refrigerant flow into the outdoor heat exchanger through the outdoor expansion valve, and lets the refrigerant absorb heat in the outdoor heat exchanger to execute dehumidifying and heating of the vehicle interior,
• wherein the control device executes a normal mode to control an operation of the compressor on the basis of a pressure of the radiator and control a valve position of the outdoor expansion valve on the basis of a temperature of the heat absorber, and
• in the normal mode, when the valve position of the outdoor expansion valve is maximized but the temperature of the heat absorber falls, the control device shifts to a heat absorber temperature control mode to control the operation of the compressor on the basis of the temperature of the heat absorber and generate heat from the auxiliary heating device.