US Patent 10421337 Vehicle air conditioner

There is disclosed a vehicle air conditioner which can effectively eliminate occurrence of excess or lack of an amount of a refrigerant to be circulated in an internal cycle mode. A controller changes and executes a heating mode, a dehumidifying and heating mode, an internal cycle mode, a dehumidifying and cooling mode, and a cooling mode. When an amount of the refrigerant to be circulated is excessively large in the internal cycle mode, a controller executes a refrigerant sealing mode to seal a refrigerant in an outdoor heat exchanger 7, and when the amount of the refrigerant to be circulated is insufficient, the controller executes a refrigerant discharge mode to discharge the refrigerant from the outdoor heat exchanger 7.